/// <summary>
/// Initializes a populated instance of the OpaqueMail.ReadOnlyMailMessage class representing the message text passed in with attachments procesed according to the attachment filter flags.
/// </summary>
/// <param name="messageText">The raw contents of the e-mail message.</param>
/// <param name="processingFlags">Flags determining whether specialized properties are returned with a ReadOnlyMailMessage.</param>
/// <param name="parseExtendedHeaders">Whether to populate the ExtendedHeaders object.</param>
public ReadOnlyMailMessage(string messageText, ReadOnlyMailMessageProcessingFlags processingFlags, bool parseExtendedHeaders)
{
if (((processingFlags & ReadOnlyMailMessageProcessingFlags.IncludeRawHeaders) > 0) &&
(processingFlags & ReadOnlyMailMessageProcessingFlags.IncludeRawBody) > 0)
{
RawMessage = messageText;
}
// Remember which specialized attachments to include.
ProcessingFlags = processingFlags;
// Fix messages whose carriage returns have been stripped.
if (messageText.IndexOf("\r") < 0)
{
messageText = messageText.Replace("\n", "\r\n");
}
// Separate the headers for processing.
string headers;
int cutoff = messageText.IndexOf("\r\n\r\n");
if (cutoff > -1)
{
headers = messageText.Substring(0, cutoff);
}
else
{
headers = messageText;
}
// Set the raw headers property if requested.
if ((processingFlags & ReadOnlyMailMessageProcessingFlags.IncludeRawHeaders) > 0)
{
RawHeaders = headers;
}
// Calculate the size of the message.
Size = messageText.Length;
// Temporary header variables to be processed by Functions.FromMailAddressString() later.
string fromText = "";
string toText = "";
string ccText = "";
string bccText = "";
string replyToText = "";
string subjectText = "";
// Temporary header variables to be processed later.
List <string> receivedChain = new List <string>();
string receivedText = "";
// Unfold any unneeded whitespace, then loop through each line of the headers.
string[] headersList = Functions.UnfoldWhitespace(headers).Replace("\r", "").Split('\n');
foreach (string header in headersList)
{
// Split header {name:value} pairs by the first colon found.
int colonPos = header.IndexOf(":");
if (colonPos > -1 && colonPos < header.Length - 1)
{
string[] headerParts = new string[] { header.Substring(0, colonPos), header.Substring(colonPos + 1).TrimStart(new char[] { ' ' }) };
string headerType = headerParts[0].ToLower();
string headerValue = headerParts[1];
// Set header variables for common headers.
if (!string.IsNullOrEmpty(headerType) && !string.IsNullOrEmpty(headerValue))
{
Headers[headerParts[0]] = headerValue;
}
switch (headerType)
{
case "cc":
if (ccText.Length > 0)
{
ccText += ", ";
}
ccText = headerValue;
break;
case "content-transfer-encoding":
ContentTransferEncoding = headerValue;
switch (headerValue.ToLower())
{
case "base64":
BodyTransferEncoding = TransferEncoding.Base64;
break;
case "quoted-printable":
BodyTransferEncoding = TransferEncoding.QuotedPrintable;
break;
case "7bit":
BodyTransferEncoding = TransferEncoding.SevenBit;
break;
case "8bit":
BodyTransferEncoding = TransferEncoding.EightBit;
break;
default:
BodyTransferEncoding = TransferEncoding.Unknown;
break;
}
break;
case "content-language":
ContentLanguage = headerValue;
break;
case "content-type":
// If multiple content-types are passed, only process the first.
if (string.IsNullOrEmpty(ContentType))
{
ContentType = headerValue.Trim();
CharSet = Functions.ExtractMimeParameter(ContentType, "charset");
}
break;
case "date":
string dateString = headerValue;
// Ignore extraneous datetime information.
int dateStringParenthesis = dateString.IndexOf("(");
if (dateStringParenthesis > -1)
{
dateString = dateString.Substring(0, dateStringParenthesis - 1);
}
// Remove timezone suffix.
if (dateString.Substring(dateString.Length - 4, 1) == " ")
{
dateString = dateString.Substring(0, dateString.Length - 4);
}
DateTime.TryParse(dateString, out Date);
break;
case "delivered-to":
DeliveredTo = headerValue;
break;
case "from":
fromText = headerValue;
break;
case "importance":
Importance = headerValue;
break;
case "in-reply-to":
// Ignore opening and closing <> characters.
InReplyTo = headerValue;
if (InReplyTo.StartsWith("<"))
{
InReplyTo = InReplyTo.Substring(1);
}
if (InReplyTo.EndsWith(">"))
{
InReplyTo = InReplyTo.Substring(0, InReplyTo.Length - 1);
}
break;
case "message-id":
// Ignore opening and closing <> characters.
MessageId = headerValue;
if (MessageId.StartsWith("<"))
{
MessageId = MessageId.Substring(1);
}
if (MessageId.EndsWith(">"))
{
MessageId = MessageId.Substring(0, MessageId.Length - 1);
}
break;
case "received":
case "x-received":
if (!string.IsNullOrEmpty(receivedText))
{
receivedChain.Add(receivedText);
}
receivedText = headerValue;
break;
case "replyto":
case "reply-to":
replyToText = headerValue;
break;
case "return-path":
// Ignore opening and closing <> characters.
ReturnPath = headerValue;
if (ReturnPath.StartsWith("<"))
{
ReturnPath = ReturnPath.Substring(1);
}
if (ReturnPath.EndsWith(">"))
{
ReturnPath = ReturnPath.Substring(0, ReturnPath.Length - 1);
}
break;
case "sender":
case "x-sender":
if (headerValue.Length > 0)
{
MailAddressCollection senderCollection = Functions.FromMailAddressString(headerValue);
if (senderCollection.Count > 0)
{
this.Sender = senderCollection[0];
}
}
break;
case "subject":
subjectText = headerValue;
break;
case "to":
if (toText.Length > 0)
{
toText += ", ";
}
toText += headerValue;
break;
case "x-priority":
switch (headerValue.ToUpper())
{
case "LOW":
Priority = MailPriority.Low;
break;
case "NORMAL":
Priority = MailPriority.Normal;
break;
case "HIGH":
Priority = MailPriority.High;
break;
}
break;
case "x-subject-encryption":
bool.TryParse(headerValue, out SubjectEncryption);
break;
default:
break;
}
// Set header variables for advanced headers.
if (parseExtendedHeaders)
{
ExtendedProperties = new ExtendedProperties();
switch (headerType)
{
case "acceptlanguage":
case "accept-language":
ExtendedProperties.AcceptLanguage = headerValue;
break;
case "authentication-results":
ExtendedProperties.AuthenticationResults = headerValue;
break;
case "bounces-to":
case "bounces_to":
ExtendedProperties.BouncesTo = headerValue;
break;
case "content-description":
ExtendedProperties.ContentDescription = headerValue;
break;
case "dispositionnotificationto":
case "disposition-notification-to":
ExtendedProperties.DispositionNotificationTo = headerValue;
break;
case "dkim-signature":
case "domainkey-signature":
case "x-google-dkim-signature":
ExtendedProperties.DomainKeySignature = headerValue;
break;
case "domainkey-status":
ExtendedProperties.DomainKeyStatus = headerValue;
break;
case "errors-to":
ExtendedProperties.ErrorsTo = headerValue;
break;
case "list-unsubscribe":
case "x-list-unsubscribe":
ExtendedProperties.ListUnsubscribe = headerValue;
break;
case "mailer":
case "x-mailer":
ExtendedProperties.Mailer = headerValue;
break;
case "organization":
case "x-originator-org":
case "x-originatororg":
case "x-organization":
ExtendedProperties.OriginatorOrg = headerValue;
break;
case "original-messageid":
case "x-original-messageid":
ExtendedProperties.OriginalMessageId = headerValue;
break;
case "originating-email":
case "x-originating-email":
ExtendedProperties.OriginatingEmail = headerValue;
break;
case "precedence":
ExtendedProperties.Precedence = headerValue;
break;
case "received-spf":
ExtendedProperties.ReceivedSPF = headerValue;
break;
case "references":
ExtendedProperties.References = headerValue;
break;
case "resent-date":
string dateString = headerValue;
// Ignore extraneous datetime information.
int dateStringParenthesis = dateString.IndexOf("(");
if (dateStringParenthesis > -1)
{
dateString = dateString.Substring(0, dateStringParenthesis - 1);
}
// Remove timezone suffix.
if (dateString.Substring(dateString.Length - 4) == " ")
{
dateString = dateString.Substring(0, dateString.Length - 4);
}
DateTime.TryParse(dateString, out ExtendedProperties.ResentDate);
break;
case "resent-from":
ExtendedProperties.ResentFrom = headerValue;
break;
case "resent-message-id":
ExtendedProperties.ResentMessageID = headerValue;
break;
case "thread-index":
ExtendedProperties.ThreadIndex = headerValue;
break;
case "thread-topic":
ExtendedProperties.ThreadTopic = headerValue;
break;
case "user-agent":
case "useragent":
ExtendedProperties.UserAgent = headerValue;
break;
case "x-auto-response-suppress":
ExtendedProperties.AutoResponseSuppress = headerValue;
break;
case "x-campaign":
case "x-campaign-id":
case "x-campaignid":
case "x-mllistcampaign":
case "x-rpcampaign":
ExtendedProperties.CampaignID = headerValue;
break;
case "x-delivery-context":
ExtendedProperties.DeliveryContext = headerValue;
break;
case "x-maillist-id":
ExtendedProperties.MailListId = headerValue;
break;
case "x-msmail-priority":
ExtendedProperties.MSMailPriority = headerValue;
break;
case "x-originalarrivaltime":
case "x-original-arrival-time":
dateString = headerValue;
// Ignore extraneous datetime information.
dateStringParenthesis = dateString.IndexOf("(");
if (dateStringParenthesis > -1)
{
dateString = dateString.Substring(0, dateStringParenthesis - 1);
}
// Remove timezone suffix.
if (dateString.Substring(dateString.Length - 4) == " ")
{
dateString = dateString.Substring(0, dateString.Length - 4);
}
DateTime.TryParse(dateString, out ExtendedProperties.OriginalArrivalTime);
break;
case "x-originating-ip":
ExtendedProperties.OriginatingIP = headerValue;
break;
case "x-rcpt-to":
if (headerValue.Length > 1)
{
ExtendedProperties.RcptTo = headerValue.Substring(1, headerValue.Length - 2);
}
break;
case "x-csa-complaints":
case "x-complaints-to":
case "x-reportabuse":
case "x-report-abuse":
case "x-mail_abuse_inquiries":
ExtendedProperties.ReportAbuse = headerValue;
break;
case "x-spam-score":
ExtendedProperties.SpamScore = headerValue;
break;
default:
break;
}
}
}
}
// Track all Received and X-Received headers.
if (!string.IsNullOrEmpty(receivedText))
{
receivedChain.Add(receivedText);
}
ReceivedChain = receivedChain.ToArray();
// Process the body if it's passed in.
string body = "";
if (cutoff > -1)
{
body = messageText.Substring(cutoff + 2);
}
if (!string.IsNullOrEmpty(body))
{
// Set the raw body property if requested.
if ((processingFlags & ReadOnlyMailMessageProcessingFlags.IncludeRawBody) > 0)
{
RawBody = body;
}
// Parse body into MIME parts.
List <MimePart> mimeParts = MimePart.ExtractMIMEParts(ContentType, CharSet, ContentTransferEncoding, body, ProcessingFlags);
// Process each MIME part.
if (mimeParts.Count > 0)
{
// Keep track of S/MIME signing and envelope encryption.
bool allMimePartsSigned = true, allMimePartsEncrypted = true, allMimePartsTripleWrapped = true;
// Process each MIME part.
for (int j = 0; j < mimeParts.Count; j++)
{
MimePart mimePart = mimeParts[j];
int semicolon = mimePart.ContentType.IndexOf(";");
if (semicolon > -1)
{
string originalContentType = mimePart.ContentType;
mimePart.ContentType = mimePart.ContentType.Substring(0, semicolon);
if (mimePart.ContentType.ToUpper() == "MESSAGE/PARTIAL")
{
PartialMessageId = Functions.ExtractMimeParameter(originalContentType, "id");
int partialMessageNumber = 0;
if (int.TryParse(Functions.ExtractMimeParameter(originalContentType, "number"), out partialMessageNumber))
{
PartialMessageNumber = partialMessageNumber;
}
}
}
// Extract any signing certificates. If this MIME part isn't signed, the overall message isn't signed.
if (mimePart.SmimeSigned)
{
if (mimePart.SmimeSigningCertificates.Count > 0 && SmimeSigningCertificate == null)
{
foreach (X509Certificate2 signingCert in mimePart.SmimeSigningCertificates)
{
if (!SmimeSigningCertificateChain.Contains(signingCert))
{
SmimeSigningCertificateChain.Add(signingCert);
SmimeSigningCertificate = signingCert;
}
}
}
}
else
{
allMimePartsSigned = false;
}
// If this MIME part isn't marked as being in an encrypted envelope, the overall message isn't encrypted.
if (!mimePart.SmimeEncryptedEnvelope)
{
// Ignore signatures and encryption blocks when determining if everything is encrypted.
if (!mimePart.ContentType.StartsWith("application/pkcs7-signature") && !mimePart.ContentType.StartsWith("application/x-pkcs7-signature") && !mimePart.ContentType.StartsWith("application/pkcs7-mime"))
{
allMimePartsEncrypted = false;
}
}
// If this MIME part isn't marked as being triple wrapped, the overall message isn't triple wrapped.
if (!mimePart.SmimeTripleWrapped)
{
// Ignore signatures and encryption blocks when determining if everything is triple wrapped.
if (!mimePart.ContentType.StartsWith("application/pkcs7-signature") && !mimePart.ContentType.StartsWith("application/x-pkcs7-signature") && !mimePart.ContentType.StartsWith("application/pkcs7-mime"))
{
allMimePartsTripleWrapped = false;
}
}
// Set the default primary body, defaulting to text/html and falling back to any text/*.
string contentTypeToUpper = mimePart.ContentType.ToUpper();
if (Body.Length < 1)
{
// If the MIME part is of type text/*, set it as the intial message body.
if (string.IsNullOrEmpty(mimePart.ContentType) || contentTypeToUpper.StartsWith("TEXT/"))
{
IsBodyHtml = contentTypeToUpper.StartsWith("TEXT/HTML");
Body = mimePart.Body;
CharSet = mimePart.CharSet;
ContentType = mimePart.ContentType;
if (mimePart.ContentTransferEncoding != TransferEncoding.Unknown)
{
BodyTransferEncoding = mimePart.ContentTransferEncoding;
}
}
else
{
// If the MIME part isn't of type text/*, treat is as an attachment.
MemoryStream attachmentStream = new MemoryStream(mimePart.BodyBytes);
Attachment attachment;
if (mimePart.ContentType.IndexOf("/") > -1)
{
attachment = new Attachment(attachmentStream, mimePart.Name, mimePart.ContentType);
}
else
{
attachment = new Attachment(attachmentStream, mimePart.Name);
}
attachment.ContentId = mimePart.ContentID;
Attachments.Add(attachment);
}
}
else
{
// If the current body isn't text/html and this is, replace the default body with the current MIME part.
if (!ContentType.ToUpper().StartsWith("TEXT/HTML") && contentTypeToUpper.StartsWith("TEXT/HTML"))
{
// Add the previous default body as an alternate view.
MemoryStream alternateViewStream = new MemoryStream(Encoding.UTF8.GetBytes(Body));
AlternateView alternateView = new AlternateView(alternateViewStream, ContentType);
if (BodyTransferEncoding != TransferEncoding.Unknown)
{
alternateView.TransferEncoding = BodyTransferEncoding;
}
AlternateViews.Add(alternateView);
IsBodyHtml = true;
Body = mimePart.Body;
CharSet = mimePart.CharSet;
ContentType = mimePart.ContentType;
if (mimePart.ContentTransferEncoding != TransferEncoding.Unknown)
{
BodyTransferEncoding = mimePart.ContentTransferEncoding;
}
}
else
{
// If the MIME part isn't of type text/*, treat is as an attachment.
MemoryStream attachmentStream = new MemoryStream(mimePart.BodyBytes);
Attachment attachment;
if (mimePart.ContentType.IndexOf("/") > -1)
{
attachment = new Attachment(attachmentStream, mimePart.Name, mimePart.ContentType);
}
else
{
attachment = new Attachment(attachmentStream, mimePart.Name);
}
attachment.ContentId = mimePart.ContentID;
Attachments.Add(attachment);
}
}
}
// OpaqueMail optional setting for protecting the subject.
if (SubjectEncryption && Body.StartsWith("Subject: "))
{
int linebreakPosition = Body.IndexOf("\r\n");
if (linebreakPosition > -1)
{
subjectText = Body.Substring(9, linebreakPosition - 9);
Body = Body.Substring(linebreakPosition + 2);
}
}
// Set the message's S/MIME attributes.
SmimeSigned = allMimePartsSigned;
SmimeEncryptedEnvelope = allMimePartsEncrypted;
SmimeTripleWrapped = allMimePartsTripleWrapped;
}
else
{
// Process non-MIME messages.
Body = body;
}
}
// Parse String representations of addresses into MailAddress objects.
if (fromText.Length > 0)
{
MailAddressCollection fromAddresses = Functions.FromMailAddressString(fromText);
if (fromAddresses.Count > 0)
{
From = fromAddresses[0];
}
}
if (toText.Length > 0)
{
To.Clear();
MailAddressCollection toAddresses = Functions.FromMailAddressString(toText);
foreach (MailAddress toAddress in toAddresses)
{
To.Add(toAddress);
}
// Add the address to the AllRecipients collection.
foreach (MailAddress toAddress in toAddresses)
{
if (!AllRecipients.Contains(toAddress.Address))
{
AllRecipients.Add(toAddress.Address);
}
}
}
if (ccText.Length > 0)
{
CC.Clear();
MailAddressCollection ccAddresses = Functions.FromMailAddressString(ccText);
foreach (MailAddress ccAddress in ccAddresses)
{
CC.Add(ccAddress);
}
// Add the address to the AllRecipients collection.
foreach (MailAddress ccAddress in ccAddresses)
{
if (!AllRecipients.Contains(ccAddress.Address))
{
AllRecipients.Add(ccAddress.Address);
}
}
}
if (bccText.Length > 0)
{
Bcc.Clear();
MailAddressCollection bccAddresses = Functions.FromMailAddressString(bccText);
foreach (MailAddress bccAddress in bccAddresses)
{
Bcc.Add(bccAddress);
}
// Add the address to the AllRecipients collection.
foreach (MailAddress bccAddress in bccAddresses)
{
if (!AllRecipients.Contains(bccAddress.Address))
{
AllRecipients.Add(bccAddress.Address);
}
}
}
if (replyToText.Length > 0)
{
ReplyToList.Clear();
MailAddressCollection replyToAddresses = Functions.FromMailAddressString(replyToText);
foreach (MailAddress replyToAddress in replyToAddresses)
{
ReplyToList.Add(replyToAddress);
}
}
// Decode international strings and remove escaped linebreaks.
Subject = Functions.DecodeMailHeader(subjectText).Replace("\r", "").Replace("\n", "");
}
/// <summary>
/// Decrypt the encrypted S/MIME envelope.
/// </summary>
/// <param name="contentType">Content Type of the outermost MIME part.</param>
/// <param name="contentTransferEncoding">Encoding of the outermost MIME part.</param>
/// <param name="envelopeText">The MIME envelope.</param>
/// <param name="processingFlags">Flags determining whether specialized properties are returned with a ReadOnlyMailMessage.</param>
/// <param name="depth">The nesting layer of this MIME part.</param>
public static List <MimePart> ReturnDecryptedMimeParts(string contentType, string contentTransferEncoding, string envelopeText, ReadOnlyMailMessageProcessingFlags processingFlags, int depth)
{
try
{
// Hydrate the envelope CMS object.
EnvelopedCms envelope = new EnvelopedCms();
// Attempt to decrypt the envelope.
envelope.Decode(Convert.FromBase64String(envelopeText));
envelope.Decrypt();
string body = Encoding.UTF8.GetString(envelope.ContentInfo.Content);
int divider = body.IndexOf("\r\n\r\n");
string mimeHeaders = body.Substring(0, divider);
body = body.Substring(divider + 4);
// Divide the MIME part's headers into its components.
string mimeContentType = "", mimeCharSet = "", mimeContentTransferEncoding = "", mimeFileName = "", mimeContentDisposition = "", mimeContentID = "";
ExtractMimeHeaders(mimeHeaders, out mimeContentType, out mimeCharSet, out mimeContentTransferEncoding, out mimeContentDisposition, out mimeFileName, out mimeContentID);
// Recurse through embedded MIME parts.
List <MimePart> mimeParts = ExtractMIMEParts(mimeContentType, mimeCharSet, mimeContentTransferEncoding, body, processingFlags, depth + 1);
foreach (MimePart mimePart in mimeParts)
{
mimePart.SmimeEncryptedEnvelope = true;
}
return(mimeParts);
}
catch (Exception)
{
// If unable to decrypt the body, return null.
return(null);
}
}
/// <summary>
/// Initializes a populated instance of the OpaqueMail.ReadOnlyMailMessage class representing the message text passed in with attachments procesed according to the attachment filter flags.
/// </summary>
/// <param name="messageText">The raw contents of the e-mail message.</param>
/// <param name="processingFlags">Flags determining whether specialized properties are returned with a ReadOnlyMailMessage.</param>
public ReadOnlyMailMessage(string messageText, ReadOnlyMailMessageProcessingFlags processingFlags) : this(messageText, processingFlags, false)
{
}
/// <summary>
/// Extract a list of MIME parts from a multipart/* MIME encoded message.
/// </summary>
/// <param name="contentType">Content Type of the outermost MIME part.</param>
/// <param name="charSet">Character set of the outermost MIME part.</param>
/// <param name="contentTransferEncoding">Encoding of the outermost MIME part.</param>
/// <param name="body">The outermost MIME part's contents.</param>
/// <param name="depth">The nesting layer of this MIME part.</param>
/// <param name="processingFlags">Flags determining whether specialized properties are returned with a ReadOnlyMailMessage.</param>
public static List <MimePart> ExtractMIMEParts(string contentType, string charSet, string contentTransferEncoding, string body, ReadOnlyMailMessageProcessingFlags processingFlags, int depth)
{
List <MimePart> mimeParts = new List <MimePart>();
string contentTypeToUpper = contentType.ToUpper();
if (contentTypeToUpper.StartsWith("MULTIPART/"))
{
// Prepare to process each part of the multipart/* message.
int cursor = 0;
// Prepend and append to the body with a carriage return and linefeed for consistent boundary matching.
body = "\r\n" + body + "\r\n";
// Determine the outermost boundary name.
string boundaryName = Functions.ExtractMimeParameter(contentType, "boundary");
int boundaryNameLength = boundaryName.Length;
// Variables used for record keeping with signed S/MIME parts.
int signatureBlock = -1;
List <string> mimeBlocks = new List <string>();
cursor = body.IndexOf("\r\n--" + boundaryName, 0, StringComparison.Ordinal);
while (cursor > -1)
{
// Calculate the end boundary of the current MIME part.
int mimeStartPosition = cursor + boundaryNameLength + 4;
int mimeEndPosition = body.IndexOf("\r\n--" + boundaryName, mimeStartPosition, StringComparison.Ordinal);
if (mimeEndPosition > -1 && (mimeEndPosition + boundaryNameLength + 6 <= body.Length))
{
string afterBoundaryEnd = body.Substring(mimeEndPosition + 4 + boundaryNameLength, 2);
if (afterBoundaryEnd == "\r\n" || afterBoundaryEnd == "--")
{
string mimeContents = body.Substring(mimeStartPosition, mimeEndPosition - mimeStartPosition);
// Extract the header portion of the current MIME part.
int mimeDivider = mimeContents.IndexOf("\r\n\r\n");
string mimeHeaders, mimeBody;
if (mimeDivider > -1)
{
mimeHeaders = mimeContents.Substring(0, mimeDivider);
mimeBody = mimeContents.Substring(mimeDivider + 4);
}
else
{
// The following is a workaround to handle malformed MIME bodies.
mimeHeaders = mimeContents;
mimeBody = "";
int linePos = 0, lastLinePos = 0;
while (linePos > -1)
{
lastLinePos = linePos;
linePos = mimeHeaders.IndexOf("\r\n", lastLinePos);
if (linePos > -1)
{
string currentLine = mimeContents.Substring(lastLinePos, linePos - lastLinePos);
if (currentLine.Length > 0 && currentLine.IndexOf(":") < 0)
{
mimeBody = mimeContents.Substring(lastLinePos + 2, mimeContents.Length - lastLinePos - 4);
linePos = -1;
}
else
{
linePos += 2;
}
}
}
}
mimeBlocks.Add(mimeContents);
// Divide the MIME part's headers into its components.
string mimeCharSet = "", mimeContentDisposition = "", mimeContentID = "", mimeContentType = "", mimeContentTransferEncoding = "", mimeFileName = "";
ExtractMimeHeaders(mimeHeaders, out mimeContentType, out mimeCharSet, out mimeContentTransferEncoding, out mimeContentDisposition, out mimeFileName, out mimeContentID);
string mimeContentTypeToUpper = mimeContentType.ToUpper();
if (mimeContentTypeToUpper.StartsWith("MULTIPART/"))
{
// Recurse through embedded MIME parts.
List <MimePart> returnedMIMEParts = ExtractMIMEParts(mimeContentType, mimeCharSet, mimeContentTransferEncoding, mimeBody, processingFlags, depth + 1);
foreach (MimePart returnedMIMEPart in returnedMIMEParts)
{
mimeParts.Add(returnedMIMEPart);
}
}
else
{
// Keep track of whether this MIME part's body has already been processed.
bool processed = false;
if (mimeContentTypeToUpper.StartsWith("APPLICATION/PKCS7-SIGNATURE") || mimeContentTypeToUpper.StartsWith("APPLICATION/X-PKCS7-SIGNATURE"))
{
// Unless a flag has been set to include this *.p7s block, exclude it from attachments.
if ((processingFlags & ReadOnlyMailMessageProcessingFlags.IncludeSmimeSignedData) == 0)
{
processed = true;
}
// Remember the signature block to use for later verification.
signatureBlock = mimeBlocks.Count() - 1;
}
else if (mimeContentTypeToUpper.StartsWith("APPLICATION/PKCS7-MIME") || mimeContentTypeToUpper.StartsWith("APPLICATION/X-PKCS7-MIME"))
{
// Unless a flag has been set to include this *.p7m block, exclude it from attachments.
processed = (processingFlags & ReadOnlyMailMessageProcessingFlags.IncludeSmimeEncryptedEnvelopeData) == 0;
// Decrypt the MIME part and recurse through embedded MIME parts.
List <MimePart> returnedMIMEParts = ReturnDecryptedMimeParts(mimeContentType, mimeContentTransferEncoding, mimeBody, processingFlags, depth + 1);
if (returnedMIMEParts != null)
{
foreach (MimePart returnedMIMEPart in returnedMIMEParts)
{
mimeParts.Add(returnedMIMEPart);
}
}
else
{
// If we were unable to decrypt, return this MIME part as-is.
processed = false;
}
}
else if (mimeContentTypeToUpper.StartsWith("APPLICATION/MS-TNEF") || mimeFileName.ToUpper() == "WINMAIL.DAT")
{
// Process the TNEF encoded message.
processed = true;
TnefEncoding tnef = new TnefEncoding(Convert.FromBase64String(mimeBody));
// If we were unable to extract content from this MIME, include it as an attachment.
if ((tnef.Body.Length < 1 && tnef.MimeAttachments.Count < 1) || (processingFlags & ReadOnlyMailMessageProcessingFlags.IncludeWinMailData) > 0)
{
processed = false;
}
else
{
// Unless a flag has been set to include this winmail.dat block, exclude it from attachments.
if ((processingFlags & ReadOnlyMailMessageProcessingFlags.IncludeWinMailData) > 0)
{
if (!string.IsNullOrEmpty(tnef.Body))
{
mimeParts.Add(new MimePart("winmail.dat", tnef.ContentType, "", "", mimeContentTransferEncoding, Encoding.UTF8.GetBytes(tnef.Body)));
}
}
foreach (MimePart mimePart in tnef.MimeAttachments)
{
mimeParts.Add(mimePart);
}
}
}
else if (mimeContentTypeToUpper == "MESSAGE/RFC822")
{
if ((processingFlags & ReadOnlyMailMessageProcessingFlags.IncludeNestedRFC822Messages) > 0)
{
// Recurse through the RFC822 container.
processed = true;
mimeDivider = mimeBody.IndexOf("\r\n\r\n");
if (mimeDivider > -1)
{
mimeHeaders = Functions.UnfoldWhitespace(mimeBody.Substring(0, mimeDivider));
mimeBody = mimeBody.Substring(mimeDivider + 4);
mimeContentType = Functions.ReturnBetween(mimeHeaders, "Content-Type:", "\r\n").Trim();
mimeContentTransferEncoding = Functions.ReturnBetween(mimeHeaders, "Content-Transfer-Encoding:", "\r\n").Trim();
mimeCharSet = Functions.ExtractMimeParameter(mimeContentType, "charset").Replace("\"", "");
List <MimePart> returnedMIMEParts = ExtractMIMEParts(mimeContentType, mimeCharSet, mimeContentTransferEncoding, mimeBody, processingFlags, depth + 1);
foreach (MimePart returnedMIMEPart in returnedMIMEParts)
{
mimeParts.Add(returnedMIMEPart);
}
}
}
}
if (!processed)
{
// Decode and add the message to the MIME parts collection.
switch (mimeContentTransferEncoding.ToLower())
{
case "base64":
mimeBody = mimeBody.Replace("\r\n", "");
if (mimeBody.Length % 4 != 0)
{
mimeBody += new String('=', 4 - (mimeBody.Length % 4));
}
mimeParts.Add(new MimePart(mimeFileName, mimeContentType, mimeCharSet, mimeContentID, mimeContentTransferEncoding, Convert.FromBase64String(mimeBody)));
break;
case "quoted-printable":
mimeParts.Add(new MimePart(mimeFileName, mimeContentType, mimeCharSet, mimeContentID, mimeContentTransferEncoding, Functions.FromQuotedPrintable(mimeBody, mimeCharSet, null)));
break;
case "binary":
case "7bit":
case "8bit":
default:
mimeParts.Add(new MimePart(mimeFileName, mimeContentType, mimeCharSet, mimeContentID, mimeContentTransferEncoding, mimeBody));
break;
}
}
}
}
cursor = mimeEndPosition;
}
else
{
cursor = -1;
}
}
// If a PKCS signature was found and there's one other MIME part, verify the signature.
if (signatureBlock > -1 && mimeBlocks.Count == 2)
{
// Verify the signature and track the signing certificates.
X509Certificate2Collection signingCertificates;
if (VerifySignature(mimeBlocks[signatureBlock], mimeBlocks[1 - signatureBlock], out signingCertificates))
{
// Stamp each MIME part found so far as signed, and if relevant, triple wrapped.
foreach (MimePart mimePart in mimeParts)
{
mimePart.SmimeSigningCertificates = signingCertificates;
if (mimePart.SmimeSigned && mimePart.SmimeEncryptedEnvelope)
{
mimePart.SmimeTripleWrapped = true;
}
mimePart.SmimeSigned = true;
}
}
}
}
else if (contentTypeToUpper.StartsWith("APPLICATION/MS-TNEF"))
{
// Process the TNEF encoded message.
TnefEncoding tnef = new TnefEncoding(Convert.FromBase64String(body));
// Unless a flag has been set to include this winmail.dat block, exclude it from attachments.
if ((processingFlags & ReadOnlyMailMessageProcessingFlags.IncludeWinMailData) > 0)
{
if (!string.IsNullOrEmpty(tnef.Body))
{
mimeParts.Add(new MimePart("winmail.dat", tnef.ContentType, "", "", "", Encoding.UTF8.GetBytes(tnef.Body)));
}
}
foreach (MimePart mimePart in tnef.MimeAttachments)
{
mimeParts.Add(mimePart);
}
}
else if (contentTypeToUpper.StartsWith("APPLICATION/PKCS7-MIME") || contentTypeToUpper.StartsWith("APPLICATION/X-PKCS7-MIME"))
{
// Don't attempt to decrypt if this is a signed message only.
if (contentType.IndexOf("smime-type=signed-data") < 0)
{
// Unless a flag has been set to include this *.p7m block, exclude it from attachments.
if ((processingFlags & ReadOnlyMailMessageProcessingFlags.IncludeSmimeEncryptedEnvelopeData) > 0)
{
mimeParts.Add(new MimePart("smime.p7m", contentType, "", "", "", body));
}
// Decrypt the MIME part and recurse through embedded MIME parts.
List <MimePart> returnedMIMEParts = ReturnDecryptedMimeParts(contentType, contentTransferEncoding, body, processingFlags, depth + 1);
if (returnedMIMEParts != null)
{
foreach (MimePart returnedMIMEPart in returnedMIMEParts)
{
mimeParts.Add(returnedMIMEPart);
}
}
else
{
// If we were unable to decrypt the message, pass it along as-is.
mimeParts.Add(new MimePart(Functions.ReturnBetween(contentType + ";", "name=", ";").Replace("\"", ""), contentType, "", "", contentTransferEncoding, body));
}
}
else
{
// Hydrate the signature CMS object.
SignedCms signedCms = new SignedCms();
try
{
// Attempt to decode the signature block and verify the passed in signature.
signedCms.Decode(Convert.FromBase64String(body));
signedCms.CheckSignature(true);
string mimeContents = Encoding.UTF8.GetString(signedCms.ContentInfo.Content);
int mimeDivider = mimeContents.IndexOf("\r\n\r\n");
string mimeHeaders;
if (mimeDivider > -1)
{
mimeHeaders = mimeContents.Substring(0, mimeDivider);
}
else
{
mimeHeaders = mimeContents;
}
if (mimeHeaders.Length > 0)
{
// Extract the body portion of the current MIME part.
string mimeBody = mimeContents.Substring(mimeDivider + 4);
string mimeCharSet = "", mimeContentDisposition = "", mimeContentID = "", mimeContentType = "", mimeContentTransferEncoding = "", mimeFileName = "";
ExtractMimeHeaders(mimeHeaders, out mimeContentType, out mimeCharSet, out mimeContentTransferEncoding, out mimeContentDisposition, out mimeFileName, out mimeContentID);
List <MimePart> returnedMIMEParts = ExtractMIMEParts(mimeContentType, mimeCharSet, mimeContentTransferEncoding, mimeBody, processingFlags, depth + 1);
foreach (MimePart returnedMIMEPart in returnedMIMEParts)
{
mimeParts.Add(returnedMIMEPart);
}
}
}
catch
{
// If an exception occured, the signature could not be verified.
}
}
}
else if (contentTypeToUpper == "MESSAGE/RFC822")
{
int mimeDivider = body.IndexOf("\r\n\r\n");
if (mimeDivider > -1)
{
string mimeHeaders = Functions.UnfoldWhitespace(body.Substring(0, mimeDivider));
string mimeBody = body.Substring(mimeDivider + 4);
string mimeContentType = Functions.ReturnBetween(mimeHeaders, "Content-Type:", "\r\n").Trim();
string mimeContentTransferEncoding = Functions.ReturnBetween(mimeHeaders, "Content-Transfer-Encoding:", "\r\n").Trim();
string mimeCharSet = Functions.ExtractMimeParameter(mimeContentType, "charset");
List <MimePart> returnedMIMEParts = ExtractMIMEParts(mimeContentType, mimeCharSet, mimeContentTransferEncoding, mimeBody, processingFlags, depth + 1);
foreach (MimePart returnedMIMEPart in returnedMIMEParts)
{
mimeParts.Add(returnedMIMEPart);
}
}
}
else
{
// Decode the message.
switch (contentTransferEncoding.ToLower())
{
case "base64":
body = Functions.FromBase64(body);
break;
case "quoted-printable":
body = Functions.FromQuotedPrintable(body, charSet, null);
break;
case "binary":
case "7bit":
case "8bit":
break;
}
// If we're beyond the first layer, process the MIME part. Otherwise, the message isn't MIME encoded.
if (depth > 0)
{
// Extract the headers from this MIME part.
string mimeHeaders;
int mimeDivider = body.IndexOf("\r\n\r\n");
if (mimeDivider > -1)
{
mimeHeaders = body.Substring(0, mimeDivider);
}
else
{
mimeHeaders = body;
}
// Divide the MIME part's headers into its components.
string mimeCharSet = "", mimeContentDisposition = "", mimeContentID = "", mimeContentType = "", mimeContentTransferEncoding = "", mimeFileName = "";
ExtractMimeHeaders(mimeHeaders, out mimeContentType, out mimeCharSet, out mimeContentTransferEncoding, out mimeContentDisposition, out mimeFileName, out mimeContentID);
// If this MIME part's content type is null, fall back to the overall content type.
if ((string.IsNullOrEmpty(mimeContentType) && !string.IsNullOrEmpty(contentType)) || (contentTypeToUpper.StartsWith("MESSAGE/PARTIAL")))
{
mimeCharSet = charSet;
mimeContentType = contentType;
}
else
{
if (body.Length > (mimeDivider + 4))
{
body = body.Substring(mimeDivider + 4);
}
else
{
body = "";
}
}
// Add the message to the MIME parts collection.
mimeParts.Add(new MimePart(mimeFileName, mimeContentType, mimeCharSet, mimeContentID, mimeContentTransferEncoding, body));
}
else
{
// If the content type contains a character set, extract it.
charSet = Functions.NormalizeCharSet(Functions.ExtractMimeParameter(contentType, "charset"));
int semicolonPos = contentType.IndexOf(";");
if (semicolonPos > -1)
{
contentType = contentType.Substring(0, semicolonPos);
}
// Add the message as-is.
mimeParts.Add(new MimePart("", contentType, charSet, "", contentTransferEncoding, body));
}
}
return(mimeParts);
}
/// <summary>
/// Decrypt the encrypted S/MIME envelope.
/// </summary>
/// <param name="contentType">Content Type of the outermost MIME part.</param>
/// <param name="contentTransferEncoding">Encoding of the outermost MIME part.</param>
/// <param name="envelopeText">The MIME envelope.</param>
/// <param name="processingFlags">Flags determining whether specialized properties are returned with a ReadOnlyMailMessage.</param>
public static List<MimePart> ReturnDecryptedMimeParts(string contentType, string contentTransferEncoding, string envelopeText, ReadOnlyMailMessageProcessingFlags processingFlags)
{
try
{
// Hydrate the envelope CMS object.
EnvelopedCms envelope = new EnvelopedCms();
// Attempt to decrypt the envelope.
envelope.Decode(Convert.FromBase64String(envelopeText));
envelope.Decrypt();
string body = Encoding.UTF8.GetString(envelope.ContentInfo.Content);
int divider = body.IndexOf("\r\n\r\n");
string mimeHeaders = body.Substring(0, divider);
body = body.Substring(divider + 4);
// Divide the MIME part's headers into its components.
string mimeContentType = "", mimeCharSet = "", mimeContentTransferEncoding = "", mimeFileName = "", mimeContentDisposition = "", mimeContentID = "";
ExtractMimeHeaders(mimeHeaders, out mimeContentType, out mimeCharSet, out mimeContentTransferEncoding, out mimeContentDisposition, out mimeFileName, out mimeContentID);
// Recurse through embedded MIME parts.
List<MimePart> mimeParts = ExtractMIMEParts(mimeContentType, mimeCharSet, mimeContentTransferEncoding, body, processingFlags);
foreach (MimePart mimePart in mimeParts)
mimePart.SmimeEncryptedEnvelope = true;
return mimeParts;
}
catch (Exception)
{
// If unable to decrypt the body, return null.
return null;
}
}
/// <summary>
/// Extract a list of MIME parts from a multipart/* MIME encoded message.
/// </summary>
/// <param name="contentType">Content Type of the outermost MIME part.</param>
/// <param name="charSet">Character set of the outermost MIME part.</param>
/// <param name="contentTransferEncoding">Encoding of the outermost MIME part.</param>
/// <param name="body">The outermost MIME part's contents.</param>
/// <param name="processingFlags">Flags determining whether specialized properties are returned with a ReadOnlyMailMessage.</param>
public static List<MimePart> ExtractMIMEParts(string contentType, string charSet, string contentTransferEncoding, string body, ReadOnlyMailMessageProcessingFlags processingFlags)
{
List<MimePart> mimeParts = new List<MimePart>();
string contentTypeToUpper = contentType.ToUpper();
if (contentTypeToUpper.StartsWith("MULTIPART/"))
{
// Prepare to process each part of the multipart/* message.
int cursor = 0;
// Prepend the body with a carriage return and linefeed for consistent boundary matching.
body = "\r\n" + body;
// Determine the outermost boundary name.
string boundaryName = Functions.ReturnBetween(contentType, "boundary=\"", "\"");
if (boundaryName.Length < 1)
{
cursor = contentType.IndexOf("boundary=", StringComparison.OrdinalIgnoreCase);
if (cursor > -1)
boundaryName = contentType.Substring(cursor + 9);
cursor = boundaryName.IndexOf(";");
if (cursor > -1)
boundaryName = boundaryName.Substring(0, cursor);
if (boundaryName.StartsWith("\"") && boundaryName.EndsWith("\""))
boundaryName = boundaryName.Substring(1, boundaryName.Length - 2);
else
{
// Remove linear whitespace from boundary names.
boundaryName = boundaryName.Trim();
}
}
int boundaryNameLength = boundaryName.Length;
// Variables used for record keeping with signed S/MIME parts.
int signatureBlock = -1;
List<string> mimeBlocks = new List<string>();
cursor = body.IndexOf("\r\n--" + boundaryName, 0, StringComparison.Ordinal);
while (cursor > -1)
{
// Calculate the end boundary of the current MIME part.
int mimeStartPosition = cursor + boundaryNameLength + 4;
int mimeEndPosition = body.IndexOf("\r\n--" + boundaryName, mimeStartPosition, StringComparison.Ordinal);
if (mimeEndPosition > -1)
{
string afterBoundaryEnd = body.Substring(mimeEndPosition + 4 + boundaryNameLength, 2);
if (afterBoundaryEnd == "\r\n" || afterBoundaryEnd == "--")
{
string mimeContents = body.Substring(mimeStartPosition, mimeEndPosition - mimeStartPosition);
// Extract the header portion of the current MIME part.
int mimeDivider = mimeContents.IndexOf("\r\n\r\n");
string mimeHeaders, mimeBody;
if (mimeDivider > -1)
{
mimeHeaders = mimeContents.Substring(0, mimeDivider);
mimeBody = mimeContents.Substring(mimeDivider + 4);
}
else
{
// The following is a workaround to handle malformed MIME bodies.
mimeHeaders = mimeContents;
mimeBody = "";
int linePos = 0, lastLinePos = 0;
while (linePos > -1)
{
lastLinePos = linePos;
linePos = mimeHeaders.IndexOf("\r\n", lastLinePos);
if (linePos > -1)
{
string currentLine = mimeContents.Substring(lastLinePos, linePos - lastLinePos);
if (currentLine.Length > 0 && currentLine.IndexOf(":") < 0)
{
mimeBody = mimeContents.Substring(lastLinePos + 2, mimeContents.Length - lastLinePos - 4);
linePos = -1;
}
else
linePos += 2;
}
}
}
mimeBlocks.Add(mimeContents);
// Divide the MIME part's headers into its components.
string mimeCharSet = "", mimeContentDisposition = "", mimeContentID = "", mimeContentType = "", mimeContentTransferEncoding = "", mimeFileName = "";
ExtractMimeHeaders(mimeHeaders, out mimeContentType, out mimeCharSet, out mimeContentTransferEncoding, out mimeContentDisposition, out mimeFileName, out mimeContentID);
string mimeContentTypeToUpper = mimeContentType.ToUpper();
if (mimeContentTypeToUpper.StartsWith("MULTIPART/"))
{
// Recurse through embedded MIME parts.
List<MimePart> returnedMIMEParts = ExtractMIMEParts(mimeContentType, mimeCharSet, mimeContentTransferEncoding, mimeBody, processingFlags);
foreach (MimePart returnedMIMEPart in returnedMIMEParts)
mimeParts.Add(returnedMIMEPart);
}
else
{
// Keep track of whether this MIME part's body has already been processed.
bool processed = false;
if (mimeContentTypeToUpper.StartsWith("APPLICATION/PKCS7-SIGNATURE") || mimeContentTypeToUpper.StartsWith("APPLICATION/X-PKCS7-SIGNATURE"))
{
// Unless a flag has been set to include this *.p7s block, exclude it from attachments.
if ((processingFlags & ReadOnlyMailMessageProcessingFlags.IncludeSmimeSignedData) == 0)
processed = true;
// Remember the signature block to use for later verification.
signatureBlock = mimeBlocks.Count() - 1;
}
else if (mimeContentTypeToUpper.StartsWith("APPLICATION/PKCS7-MIME") || mimeContentTypeToUpper.StartsWith("APPLICATION/X-PKCS7-MIME"))
{
// Unless a flag has been set to include this *.p7m block, exclude it from attachments.
processed = (processingFlags & ReadOnlyMailMessageProcessingFlags.IncludeSmimeEncryptedEnvelopeData) == 0;
// Decrypt the MIME part and recurse through embedded MIME parts.
List<MimePart> returnedMIMEParts = ReturnDecryptedMimeParts(mimeContentType, mimeContentTransferEncoding, mimeBody, processingFlags);
if (returnedMIMEParts != null)
{
foreach (MimePart returnedMIMEPart in returnedMIMEParts)
mimeParts.Add(returnedMIMEPart);
}
else
{
// If we were unable to decrypt, return this MIME part as-is.
processed = false;
}
}
else if (mimeContentTypeToUpper.StartsWith("APPLICATION/MS-TNEF") || mimeFileName.ToUpper() == "WINMAIL.DAT")
{
// Process the TNEF encoded message.
processed = true;
TnefEncoding tnef = new TnefEncoding(Convert.FromBase64String(mimeBody));
// If we were unable to extract content from this MIME, include it as an attachment.
if ((tnef.Body.Length < 1 && tnef.MimeAttachments.Count < 1) || (processingFlags & ReadOnlyMailMessageProcessingFlags.IncludeWinMailData) > 0)
processed = false;
else
{
// Unless a flag has been set to include this winmail.dat block, exclude it from attachments.
if ((processingFlags & ReadOnlyMailMessageProcessingFlags.IncludeWinMailData) > 0)
{
if (!string.IsNullOrEmpty(tnef.Body))
mimeParts.Add(new MimePart("winmail.dat", tnef.ContentType, "", "", mimeContentTransferEncoding, Encoding.UTF8.GetBytes(tnef.Body)));
}
foreach (MimePart mimePart in tnef.MimeAttachments)
mimeParts.Add(mimePart);
}
}
else if (mimeContentTypeToUpper == "MESSAGE/RFC822")
{
if ((processingFlags & ReadOnlyMailMessageProcessingFlags.IncludeNestedRFC822Messages) > 0)
{
// Recurse through the RFC822 container.
processed = true;
mimeDivider = mimeBody.IndexOf("\r\n\r\n");
if (mimeDivider > -1)
{
mimeHeaders = Functions.UnfoldWhitespace(mimeBody.Substring(0, mimeDivider));
mimeBody = mimeBody.Substring(mimeDivider + 4);
mimeContentType = Functions.ReturnBetween(mimeHeaders, "Content-Type:", "\r\n").Trim();
mimeContentTransferEncoding = Functions.ReturnBetween(mimeHeaders, "Content-Transfer-Encoding:", "\r\n").Trim();
mimeCharSet = Functions.ExtractMimeParameter(mimeContentType, "charset").Replace("\"", "");
List<MimePart> returnedMIMEParts = ExtractMIMEParts(mimeContentType, mimeCharSet, mimeContentTransferEncoding, mimeBody, processingFlags);
foreach (MimePart returnedMIMEPart in returnedMIMEParts)
mimeParts.Add(returnedMIMEPart);
}
}
}
if (!processed)
{
// Decode and add the message to the MIME parts collection.
switch (mimeContentTransferEncoding.ToLower())
{
case "base64":
mimeBody = mimeBody.Replace("\r\n", "");
if (mimeBody.Length % 4 != 0)
mimeBody += new String('=', 4 - (mimeBody.Length % 4));
mimeParts.Add(new MimePart(mimeFileName, mimeContentType, mimeCharSet, mimeContentID, mimeContentTransferEncoding, Convert.FromBase64String(mimeBody)));
break;
case "quoted-printable":
mimeParts.Add(new MimePart(mimeFileName, mimeContentType, mimeCharSet, mimeContentID, mimeContentTransferEncoding, Functions.FromQuotedPrintable(mimeBody, mimeCharSet, null)));
break;
case "binary":
case "7bit":
case "8bit":
default:
mimeParts.Add(new MimePart(mimeFileName, mimeContentType, mimeCharSet, mimeContentID, mimeContentTransferEncoding, mimeBody));
break;
}
}
}
}
cursor = mimeEndPosition;
}
else
cursor = -1;
}
// If a PKCS signature was found and there's one other MIME part, verify the signature.
if (signatureBlock > -1 && mimeBlocks.Count == 2)
{
// Verify the signature and track the signing certificates.
X509Certificate2Collection signingCertificates;
if (VerifySignature(mimeBlocks[signatureBlock], mimeBlocks[1 - signatureBlock], out signingCertificates))
{
// Stamp each MIME part found so far as signed, and if relevant, triple wrapped.
foreach (MimePart mimePart in mimeParts)
{
mimePart.SmimeSigningCertificates = signingCertificates;
if (mimePart.SmimeSigned && mimePart.SmimeEncryptedEnvelope)
mimePart.SmimeTripleWrapped = true;
mimePart.SmimeSigned = true;
}
}
}
}
else if (contentTypeToUpper.StartsWith("APPLICATION/MS-TNEF"))
{
// Process the TNEF encoded message.
TnefEncoding tnef = new TnefEncoding(Convert.FromBase64String(body));
// Unless a flag has been set to include this winmail.dat block, exclude it from attachments.
if ((processingFlags & ReadOnlyMailMessageProcessingFlags.IncludeWinMailData) > 0)
{
if (!string.IsNullOrEmpty(tnef.Body))
mimeParts.Add(new MimePart("winmail.dat", tnef.ContentType, "", "", "", Encoding.UTF8.GetBytes(tnef.Body)));
}
foreach (MimePart mimePart in tnef.MimeAttachments)
mimeParts.Add(mimePart);
}
else if (contentTypeToUpper.StartsWith("APPLICATION/PKCS7-MIME") || contentTypeToUpper.StartsWith("APPLICATION/X-PKCS7-MIME"))
{
// Don't attempt to decrypt if this is a signed message only.
if (contentType.IndexOf("smime-type=signed-data") < 0)
{
// Unless a flag has been set to include this *.p7m block, exclude it from attachments.
if ((processingFlags & ReadOnlyMailMessageProcessingFlags.IncludeSmimeEncryptedEnvelopeData) > 0)
mimeParts.Add(new MimePart("smime.p7m", contentType, "", "", "", body));
// Decrypt the MIME part and recurse through embedded MIME parts.
List<MimePart> returnedMIMEParts = ReturnDecryptedMimeParts(contentType, contentTransferEncoding, body, processingFlags);
if (returnedMIMEParts != null)
{
foreach (MimePart returnedMIMEPart in returnedMIMEParts)
mimeParts.Add(returnedMIMEPart);
}
else
{
// If we were unable to decrypt the message, pass it along as-is.
mimeParts.Add(new MimePart(Functions.ReturnBetween(contentType + ";", "name=", ";").Replace("\"", ""), contentType, "", "", contentTransferEncoding, body));
}
}
else
{
// Hydrate the signature CMS object.
SignedCms signedCms = new SignedCms();
try
{
// Attempt to decode the signature block and verify the passed in signature.
signedCms.Decode(Convert.FromBase64String(body));
signedCms.CheckSignature(true);
string mimeContents = Encoding.UTF8.GetString(signedCms.ContentInfo.Content);
int mimeDivider = mimeContents.IndexOf("\r\n\r\n");
string mimeHeaders;
if (mimeDivider > -1)
mimeHeaders = mimeContents.Substring(0, mimeDivider);
else
mimeHeaders = mimeContents;
if (mimeHeaders.Length > 0)
{
// Extract the body portion of the current MIME part.
string mimeBody = mimeContents.Substring(mimeDivider + 4);
string mimeCharSet = "", mimeContentDisposition = "", mimeContentID = "", mimeContentType = "", mimeContentTransferEncoding = "", mimeFileName = "";
ExtractMimeHeaders(mimeHeaders, out mimeContentType, out mimeCharSet, out mimeContentTransferEncoding, out mimeContentDisposition, out mimeFileName, out mimeContentID);
List<MimePart> returnedMIMEParts = ExtractMIMEParts(mimeContentType, mimeCharSet, mimeContentTransferEncoding, mimeBody, processingFlags);
foreach (MimePart returnedMIMEPart in returnedMIMEParts)
mimeParts.Add(returnedMIMEPart);
}
}
catch
{
// If an exception occured, the signature could not be verified.
}
}
}
else if (contentTypeToUpper == "MESSAGE/RFC822")
{
int mimeDivider = body.IndexOf("\r\n\r\n");
if (mimeDivider > -1)
{
string mimeHeaders = Functions.UnfoldWhitespace(body.Substring(0, mimeDivider));
string mimeBody = body.Substring(mimeDivider + 4);
string mimeContentType = Functions.ReturnBetween(mimeHeaders, "Content-Type:", "\r\n").Trim();
string mimeContentTransferEncoding = Functions.ReturnBetween(mimeHeaders, "Content-Transfer-Encoding:", "\r\n").Trim();
string mimeCharSet = Functions.ExtractMimeParameter(mimeContentType, "charset");
List<MimePart> returnedMIMEParts = ExtractMIMEParts(mimeContentType, mimeCharSet, mimeContentTransferEncoding, mimeBody, processingFlags);
foreach (MimePart returnedMIMEPart in returnedMIMEParts)
mimeParts.Add(returnedMIMEPart);
}
}
else
{
// Decode the message.
switch (contentTransferEncoding.ToLower())
{
case "base64":
body = Functions.FromBase64(body);
break;
case "quoted-printable":
body = Functions.FromQuotedPrintable(body, charSet, null);
break;
case "binary":
case "7bit":
case "8bit":
break;
}
// Extract the headers from this MIME part.
string mimeHeaders;
int mimeDivider = body.IndexOf("\r\n\r\n");
if (mimeDivider > -1 )
mimeHeaders = body.Substring(0, mimeDivider);
else
mimeHeaders = body;
// Divide the MIME part's headers into its components.
string mimeCharSet = "", mimeContentDisposition = "", mimeContentID = "", mimeContentType = "", mimeContentTransferEncoding = "", mimeFileName = "";
ExtractMimeHeaders(mimeHeaders, out mimeContentType, out mimeCharSet, out mimeContentTransferEncoding, out mimeContentDisposition, out mimeFileName, out mimeContentID);
// If this MIME part's content type is null, fall back to the overall content type.
if ((string.IsNullOrEmpty(mimeContentType) && !string.IsNullOrEmpty(contentType)) || (contentTypeToUpper.StartsWith("MESSAGE/PARTIAL")))
{
mimeCharSet = charSet;
mimeContentType = contentType;
}
else
{
if (body.Length > (mimeDivider + 4))
body = body.Substring(mimeDivider + 4);
else
body = "";
}
// Add the message to the MIME parts collection.
mimeParts.Add(new MimePart(mimeFileName, mimeContentType, mimeCharSet, mimeContentID, mimeContentTransferEncoding, body));
}
return mimeParts;
}
/// <summary>
/// Initializes a populated instance of the OpaqueMail.ReadOnlyMailMessage class representing the message text passed in with attachments procesed according to the attachment filter flags.
/// </summary>
/// <param name="messageText">The raw contents of the e-mail message.</param>
/// <param name="processingFlags">Flags determining whether specialized properties are returned with a ReadOnlyMailMessage.</param>
/// <param name="parseExtendedHeaders">Whether to populate the ExtendedHeaders object.</param>
public ReadOnlyMailMessage(string messageText, ReadOnlyMailMessageProcessingFlags processingFlags, bool parseExtendedHeaders)
{
if (((processingFlags & ReadOnlyMailMessageProcessingFlags.IncludeRawHeaders) > 0)
&& (processingFlags & ReadOnlyMailMessageProcessingFlags.IncludeRawBody) > 0)
RawMessage = messageText;
// Remember which specialized attachments to include.
ProcessingFlags = processingFlags;
// Fix messages whose carriage returns have been stripped.
if (messageText.IndexOf("\r") < 0)
messageText = messageText.Replace("\n", "\r\n");
// Separate the headers for processing.
string headers;
int cutoff = messageText.IndexOf("\r\n\r\n");
if (cutoff > -1)
headers = messageText.Substring(0, cutoff);
else
headers = messageText;
// Set the raw headers property if requested.
if ((processingFlags & ReadOnlyMailMessageProcessingFlags.IncludeRawHeaders) > 0)
RawHeaders = headers;
// Calculate the size of the message.
Size = messageText.Length;
// Temporary header variables to be processed by Functions.FromMailAddressString() later.
string fromText = "";
string toText = "";
string ccText = "";
string bccText = "";
string replyToText = "";
string subjectText = "";
// Temporary header variables to be processed later.
List<string> receivedChain = new List<string>();
string receivedText = "";
// Unfold any unneeded whitespace, then loop through each line of the headers.
string[] headersList = Functions.UnfoldWhitespace(headers).Replace("\r", "").Split('\n');
foreach (string header in headersList)
{
// Split header {name:value} pairs by the first colon found.
int colonPos = header.IndexOf(":");
if (colonPos > -1 && colonPos < header.Length - 1)
{
string[] headerParts = new string[] { header.Substring(0, colonPos), header.Substring(colonPos + 1).TrimStart(new char[] { ' ' }) };
string headerType = headerParts[0].ToLower();
string headerValue = headerParts[1];
// Set header variables for common headers.
if (!string.IsNullOrEmpty(headerType) && !string.IsNullOrEmpty(headerValue))
Headers[headerParts[0]] = headerValue;
switch (headerType)
{
case "cc":
if (ccText.Length > 0)
ccText += ", ";
ccText = headerValue;
break;
case "content-transfer-encoding":
ContentTransferEncoding = headerValue;
switch (headerValue.ToLower())
{
case "base64":
BodyTransferEncoding = TransferEncoding.Base64;
break;
case "quoted-printable":
BodyTransferEncoding = TransferEncoding.QuotedPrintable;
break;
case "7bit":
BodyTransferEncoding = TransferEncoding.SevenBit;
break;
case "8bit":
BodyTransferEncoding = TransferEncoding.EightBit;
break;
default:
BodyTransferEncoding = TransferEncoding.Unknown;
break;
}
break;
case "content-language":
ContentLanguage = headerValue;
break;
case "content-type":
// If multiple content-types are passed, only process the first.
if (string.IsNullOrEmpty(ContentType))
{
ContentType = headerValue.Trim();
CharSet = Functions.ExtractMimeParameter(ContentType, "charset");
}
break;
case "date":
string dateString = headerValue;
// Ignore extraneous datetime information.
int dateStringParenthesis = dateString.IndexOf("(");
if (dateStringParenthesis > -1)
dateString = dateString.Substring(0, dateStringParenthesis - 1);
// Remove timezone suffix.
if (dateString.Substring(dateString.Length - 4, 1) == " ")
dateString = dateString.Substring(0, dateString.Length - 4);
DateTime.TryParse(dateString, out Date);
break;
case "delivered-to":
DeliveredTo = headerValue;
break;
case "from":
fromText = headerValue;
break;
case "importance":
Importance = headerValue;
break;
case "in-reply-to":
// Ignore opening and closing <> characters.
InReplyTo = headerValue;
if (InReplyTo.StartsWith("<"))
InReplyTo = InReplyTo.Substring(1);
if (InReplyTo.EndsWith(">"))
InReplyTo = InReplyTo.Substring(0, InReplyTo.Length - 1);
break;
case "message-id":
// Ignore opening and closing <> characters.
MessageId = headerValue;
if (MessageId.StartsWith("<"))
MessageId = MessageId.Substring(1);
if (MessageId.EndsWith(">"))
MessageId = MessageId.Substring(0, MessageId.Length - 1);
break;
case "received":
case "x-received":
if (!string.IsNullOrEmpty(receivedText))
receivedChain.Add(receivedText);
receivedText = headerValue;
break;
case "replyto":
case "reply-to":
replyToText = headerValue;
break;
case "return-path":
// Ignore opening and closing <> characters.
ReturnPath = headerValue;
if (ReturnPath.StartsWith("<"))
ReturnPath = ReturnPath.Substring(1);
if (ReturnPath.EndsWith(">"))
ReturnPath = ReturnPath.Substring(0, ReturnPath.Length - 1);
break;
case "sender":
case "x-sender":
if (headerValue.Length > 0)
{
MailAddressCollection senderCollection = Functions.FromMailAddressString(headerValue);
if (senderCollection.Count > 0)
this.Sender = senderCollection[0];
}
break;
case "subject":
subjectText = headerValue;
break;
case "to":
if (toText.Length > 0)
toText += ", ";
toText += headerValue;
break;
case "x-priority":
switch (headerValue.ToUpper())
{
case "LOW":
Priority = MailPriority.Low;
break;
case "NORMAL":
Priority = MailPriority.Normal;
break;
case "HIGH":
Priority = MailPriority.High;
break;
}
break;
case "x-subject-encryption":
bool.TryParse(headerValue, out SubjectEncryption);
break;
default:
break;
}
// Set header variables for advanced headers.
if (parseExtendedHeaders)
{
ExtendedProperties = new ExtendedProperties();
switch (headerType)
{
case "acceptlanguage":
case "accept-language":
ExtendedProperties.AcceptLanguage = headerValue;
break;
case "authentication-results":
ExtendedProperties.AuthenticationResults = headerValue;
break;
case "bounces-to":
case "bounces_to":
ExtendedProperties.BouncesTo = headerValue;
break;
case "content-description":
ExtendedProperties.ContentDescription = headerValue;
break;
case "dispositionnotificationto":
case "disposition-notification-to":
ExtendedProperties.DispositionNotificationTo = headerValue;
break;
case "dkim-signature":
case "domainkey-signature":
case "x-google-dkim-signature":
ExtendedProperties.DomainKeySignature = headerValue;
break;
case "domainkey-status":
ExtendedProperties.DomainKeyStatus = headerValue;
break;
case "errors-to":
ExtendedProperties.ErrorsTo = headerValue;
break;
case "list-unsubscribe":
case "x-list-unsubscribe":
ExtendedProperties.ListUnsubscribe = headerValue;
break;
case "mailer":
case "x-mailer":
ExtendedProperties.Mailer = headerValue;
break;
case "organization":
case "x-originator-org":
case "x-originatororg":
case "x-organization":
ExtendedProperties.OriginatorOrg = headerValue;
break;
case "original-messageid":
case "x-original-messageid":
ExtendedProperties.OriginalMessageId = headerValue;
break;
case "originating-email":
case "x-originating-email":
ExtendedProperties.OriginatingEmail = headerValue;
break;
case "precedence":
ExtendedProperties.Precedence = headerValue;
break;
case "received-spf":
ExtendedProperties.ReceivedSPF = headerValue;
break;
case "references":
ExtendedProperties.References = headerValue;
break;
case "resent-date":
string dateString = headerValue;
// Ignore extraneous datetime information.
int dateStringParenthesis = dateString.IndexOf("(");
if (dateStringParenthesis > -1)
dateString = dateString.Substring(0, dateStringParenthesis - 1);
// Remove timezone suffix.
if (dateString.Substring(dateString.Length - 4) == " ")
dateString = dateString.Substring(0, dateString.Length - 4);
DateTime.TryParse(dateString, out ExtendedProperties.ResentDate);
break;
case "resent-from":
ExtendedProperties.ResentFrom = headerValue;
break;
case "resent-message-id":
ExtendedProperties.ResentMessageID = headerValue;
break;
case "thread-index":
ExtendedProperties.ThreadIndex = headerValue;
break;
case "thread-topic":
ExtendedProperties.ThreadTopic = headerValue;
break;
case "user-agent":
case "useragent":
ExtendedProperties.UserAgent = headerValue;
break;
case "x-auto-response-suppress":
ExtendedProperties.AutoResponseSuppress = headerValue;
break;
case "x-campaign":
case "x-campaign-id":
case "x-campaignid":
case "x-mllistcampaign":
case "x-rpcampaign":
ExtendedProperties.CampaignID = headerValue;
break;
case "x-delivery-context":
ExtendedProperties.DeliveryContext = headerValue;
break;
case "x-maillist-id":
ExtendedProperties.MailListId = headerValue;
break;
case "x-msmail-priority":
ExtendedProperties.MSMailPriority = headerValue;
break;
case "x-originalarrivaltime":
case "x-original-arrival-time":
dateString = headerValue;
// Ignore extraneous datetime information.
dateStringParenthesis = dateString.IndexOf("(");
if (dateStringParenthesis > -1)
dateString = dateString.Substring(0, dateStringParenthesis - 1);
// Remove timezone suffix.
if (dateString.Substring(dateString.Length - 4) == " ")
dateString = dateString.Substring(0, dateString.Length - 4);
DateTime.TryParse(dateString, out ExtendedProperties.OriginalArrivalTime);
break;
case "x-originating-ip":
ExtendedProperties.OriginatingIP = headerValue;
break;
case "x-rcpt-to":
if (headerValue.Length > 1)
ExtendedProperties.RcptTo = headerValue.Substring(1, headerValue.Length - 2);
break;
case "x-csa-complaints":
case "x-complaints-to":
case "x-reportabuse":
case "x-report-abuse":
case "x-mail_abuse_inquiries":
ExtendedProperties.ReportAbuse = headerValue;
break;
case "x-spam-score":
ExtendedProperties.SpamScore = headerValue;
break;
default:
break;
}
}
}
}
// Track all Received and X-Received headers.
if (!string.IsNullOrEmpty(receivedText))
receivedChain.Add(receivedText);
ReceivedChain = receivedChain.ToArray();
// Process the body if it's passed in.
string body = "";
if (cutoff > -1)
body = messageText.Substring(cutoff + 2);
if (!string.IsNullOrEmpty(body))
{
// Set the raw body property if requested.
if ((processingFlags & ReadOnlyMailMessageProcessingFlags.IncludeRawBody) > 0)
RawBody = body;
// Parse body into MIME parts.
List<MimePart> mimeParts = MimePart.ExtractMIMEParts(ContentType, CharSet, ContentTransferEncoding, body, ProcessingFlags);
// Process each MIME part.
if (mimeParts.Count > 0)
{
// Keep track of S/MIME signing and envelope encryption.
bool allMimePartsSigned = true, allMimePartsEncrypted = true, allMimePartsTripleWrapped = true;
// Process each MIME part.
for (int j = 0; j < mimeParts.Count; j++)
{
MimePart mimePart = mimeParts[j];
int semicolon = mimePart.ContentType.IndexOf(";");
if (semicolon > -1)
{
string originalContentType = mimePart.ContentType;
mimePart.ContentType = mimePart.ContentType.Substring(0, semicolon);
if (mimePart.ContentType.ToUpper() == "MESSAGE/PARTIAL")
{
PartialMessageId = Functions.ExtractMimeParameter(originalContentType, "id");
int partialMessageNumber = 0;
if (int.TryParse(Functions.ExtractMimeParameter(originalContentType, "number"), out partialMessageNumber))
PartialMessageNumber = partialMessageNumber;
}
}
// Extract any signing certificates. If this MIME part isn't signed, the overall message isn't signed.
if (mimePart.SmimeSigned)
{
if (mimePart.SmimeSigningCertificates.Count > 0 && SmimeSigningCertificate == null)
{
foreach (X509Certificate2 signingCert in mimePart.SmimeSigningCertificates)
{
if (!SmimeSigningCertificateChain.Contains(signingCert))
{
SmimeSigningCertificateChain.Add(signingCert);
SmimeSigningCertificate = signingCert;
}
}
}
}
else
allMimePartsSigned = false;
// If this MIME part isn't marked as being in an encrypted envelope, the overall message isn't encrypted.
if (!mimePart.SmimeEncryptedEnvelope)
{
// Ignore signatures and encryption blocks when determining if everything is encrypted.
if (!mimePart.ContentType.StartsWith("application/pkcs7-signature") && !mimePart.ContentType.StartsWith("application/x-pkcs7-signature") && !mimePart.ContentType.StartsWith("application/pkcs7-mime"))
allMimePartsEncrypted = false;
}
// If this MIME part isn't marked as being triple wrapped, the overall message isn't triple wrapped.
if (!mimePart.SmimeTripleWrapped)
{
// Ignore signatures and encryption blocks when determining if everything is triple wrapped.
if (!mimePart.ContentType.StartsWith("application/pkcs7-signature") && !mimePart.ContentType.StartsWith("application/x-pkcs7-signature") && !mimePart.ContentType.StartsWith("application/pkcs7-mime"))
allMimePartsTripleWrapped = false;
}
// Set the default primary body, defaulting to text/html and falling back to any text/*.
string contentTypeToUpper = mimePart.ContentType.ToUpper();
if (Body.Length < 1)
{
// If the MIME part is of type text/*, set it as the intial message body.
if (string.IsNullOrEmpty(mimePart.ContentType) || contentTypeToUpper.StartsWith("TEXT/"))
{
IsBodyHtml = contentTypeToUpper.StartsWith("TEXT/HTML");
Body = mimePart.Body;
CharSet = mimePart.CharSet;
ContentType = mimePart.ContentType;
if (mimePart.ContentTransferEncoding != TransferEncoding.Unknown)
BodyTransferEncoding = mimePart.ContentTransferEncoding;
}
else
{
// If the MIME part isn't of type text/*, treat is as an attachment.
MemoryStream attachmentStream = new MemoryStream(mimePart.BodyBytes);
Attachment attachment;
if (mimePart.ContentType.IndexOf("/") > -1)
attachment = new Attachment(attachmentStream, mimePart.Name, mimePart.ContentType);
else
attachment = new Attachment(attachmentStream, mimePart.Name);
attachment.ContentId = mimePart.ContentID;
Attachments.Add(attachment);
}
}
else
{
// If the current body isn't text/html and this is, replace the default body with the current MIME part.
if (!ContentType.ToUpper().StartsWith("TEXT/HTML") && contentTypeToUpper.StartsWith("TEXT/HTML"))
{
// Add the previous default body as an alternate view.
MemoryStream alternateViewStream = new MemoryStream(Encoding.UTF8.GetBytes(Body));
AlternateView alternateView = new AlternateView(alternateViewStream, ContentType);
if (BodyTransferEncoding != TransferEncoding.Unknown)
alternateView.TransferEncoding = BodyTransferEncoding;
AlternateViews.Add(alternateView);
IsBodyHtml = true;
Body = mimePart.Body;
CharSet = mimePart.CharSet;
ContentType = mimePart.ContentType;
if (mimePart.ContentTransferEncoding != TransferEncoding.Unknown)
BodyTransferEncoding = mimePart.ContentTransferEncoding;
}
else
{
// If the MIME part isn't of type text/*, treat is as an attachment.
MemoryStream attachmentStream = new MemoryStream(mimePart.BodyBytes);
Attachment attachment;
if (mimePart.ContentType.IndexOf("/") > -1)
attachment = new Attachment(attachmentStream, mimePart.Name, mimePart.ContentType);
else
attachment = new Attachment(attachmentStream, mimePart.Name);
attachment.ContentId = mimePart.ContentID;
Attachments.Add(attachment);
}
}
}
// OpaqueMail optional setting for protecting the subject.
if (SubjectEncryption && Body.StartsWith("Subject: "))
{
int linebreakPosition = Body.IndexOf("\r\n");
if (linebreakPosition > -1)
{
subjectText = Body.Substring(9, linebreakPosition - 9);
Body = Body.Substring(linebreakPosition + 2);
}
}
// Set the message's S/MIME attributes.
SmimeSigned = allMimePartsSigned;
SmimeEncryptedEnvelope = allMimePartsEncrypted;
SmimeTripleWrapped = allMimePartsTripleWrapped;
}
else
{
// Process non-MIME messages.
Body = body;
}
}
// Parse String representations of addresses into MailAddress objects.
if (fromText.Length > 0)
{
MailAddressCollection fromAddresses = Functions.FromMailAddressString(fromText);
if (fromAddresses.Count > 0)
From = fromAddresses[0];
}
if (toText.Length > 0)
{
To.Clear();
MailAddressCollection toAddresses = Functions.FromMailAddressString(toText);
foreach (MailAddress toAddress in toAddresses)
To.Add(toAddress);
// Add the address to the AllRecipients collection.
foreach (MailAddress toAddress in toAddresses)
{
if (!AllRecipients.Contains(toAddress.Address))
AllRecipients.Add(toAddress.Address);
}
}
if (ccText.Length > 0)
{
CC.Clear();
MailAddressCollection ccAddresses = Functions.FromMailAddressString(ccText);
foreach (MailAddress ccAddress in ccAddresses)
CC.Add(ccAddress);
// Add the address to the AllRecipients collection.
foreach (MailAddress ccAddress in ccAddresses)
{
if (!AllRecipients.Contains(ccAddress.Address))
AllRecipients.Add(ccAddress.Address);
}
}
if (bccText.Length > 0)
{
Bcc.Clear();
MailAddressCollection bccAddresses = Functions.FromMailAddressString(bccText);
foreach (MailAddress bccAddress in bccAddresses)
Bcc.Add(bccAddress);
// Add the address to the AllRecipients collection.
foreach (MailAddress bccAddress in bccAddresses)
{
if (!AllRecipients.Contains(bccAddress.Address))
AllRecipients.Add(bccAddress.Address);
}
}
if (replyToText.Length > 0)
{
ReplyToList.Clear();
MailAddressCollection replyToAddresses = Functions.FromMailAddressString(replyToText);
foreach (MailAddress replyToAddress in replyToAddresses)
ReplyToList.Add(replyToAddress);
}
// Decode international strings and remove escaped linebreaks.
Subject = Functions.DecodeMailHeader(subjectText).Replace("\r", "").Replace("\n", "");
}
/// <summary>
/// Initializes a populated instance of the OpaqueMail.ReadOnlyMailMessage class representing the message text passed in with attachments procesed according to the attachment filter flags.
/// </summary>
/// <param name="messageText">The raw contents of the e-mail message.</param>
/// <param name="processingFlags">Flags determining whether specialized properties are returned with a ReadOnlyMailMessage.</param>
public ReadOnlyMailMessage(string messageText, ReadOnlyMailMessageProcessingFlags processingFlags) : this(messageText, processingFlags, false) { }
