public void Decode()
{
string rcptTo = string.Empty;
int internalSendID = -1;
bool decoded = ReturnPathManager.TryDecode("return-test=remote-A@localhost", out rcptTo, out internalSendID);
Assert.True(decoded);
Assert.AreEqual("test@remote", rcptTo);
Assert.AreEqual(10, internalSendID);
decoded = ReturnPathManager.TryDecode("< return-test=remote-a@localhost>", out rcptTo, out internalSendID);
Assert.True(decoded);
Assert.AreEqual("test@remote", rcptTo);
Assert.AreEqual(10, internalSendID);
}
/// <summary>
/// Looks through a feedback loop email looking for something to identify it as an abuse report and who it relates to.
/// If found, logs the event.
///
/// How to get the info depending on the ESP (and this is likely to be the best order to check for each too):
/// Abuse Report Original-Mail-From. [Yahoo]
/// Message-ID from body part child with content-type of message/rfc822. [AOL]
/// Return-Path in main message headers. [Hotmail]
/// </summary>
/// <param name="message">The feedback look email.</param>
public EmailProcessingDetails ProcessFeedbackLoop(string content)
{
EmailProcessingDetails processingDetails = new EmailProcessingDetails();
MimeMessage message = MimeMessage.Parse(content);
if (message == null)
{
processingDetails.ProcessingResult = EmailProcessingResult.ErrorContent;
return(processingDetails);
}
try
{
// Step 1: Yahoo! provide useable Abuse Reports (AOL's are all redacted).
//Look for abuse report
BodyPart abuseBodyPart = null;
if (this.FindFirstBodyPartByMediaType(message.BodyParts, "message/feedback-report", out abuseBodyPart))
{
// Found an abuse report body part to examine.
// Abuse report content may have long lines whitespace folded.
string abuseReportBody = MimeMessage.UnfoldHeaders(abuseBodyPart.GetDecodedBody());
using (StringReader reader = new StringReader(abuseReportBody))
{
while (reader.Peek() > -1)
{
string line = reader.ReadToCrLf();
// The original mail from value will be the return-path we'd set so we should be able to get all the values we need from that.
if (line.StartsWith("Original-Mail-From:", StringComparison.OrdinalIgnoreCase))
{
string tmp = line.Substring("Original-Mail-From: ".Length - 1);
try
{
int internalSendID = -1;
string rcptTo = string.Empty;
if (ReturnPathManager.TryDecode(tmp, out rcptTo, out internalSendID))
{
// NEED TO LOG TO DB HERE!!!!!
Sends.Send snd = MantaMTA.Core.DAL.SendDB.GetSend(internalSendID);
Save(new MantaAbuseEvent
{
EmailAddress = rcptTo,
EventTime = DateTime.UtcNow,
EventType = MantaEventType.Abuse,
SendID = (snd == null ? string.Empty : snd.ID)
});
processingDetails.ProcessingResult = EmailProcessingResult.SuccessAbuse;
return(processingDetails);
}
}
catch (Exception)
{
// Must be redacted
break;
}
}
}
}
}
// Function to use against BodyParts to find a return-path header.
Func <MessageHeaderCollection, bool> checkForReturnPathHeaders = delegate(MessageHeaderCollection headers)
{
MessageHeader returnPathHeader = headers.GetFirstOrDefault("Return-Path");
if (returnPathHeader != null && !string.IsNullOrWhiteSpace(returnPathHeader.Value))
{
int internalSendID = -1;
string rcptTo = string.Empty;
if (ReturnPathManager.TryDecode(returnPathHeader.Value, out rcptTo, out internalSendID))
{
if (!rcptTo.StartsWith("redacted@", StringComparison.OrdinalIgnoreCase))
{
// NEED TO LOG TO DB HERE!!!!!
Sends.Send snd = MantaMTA.Core.DAL.SendDB.GetSend(internalSendID);
Save(new MantaAbuseEvent
{
EmailAddress = rcptTo,
EventTime = DateTime.UtcNow,
EventType = MantaEventType.Abuse,
SendID = (snd == null ? string.Empty : snd.ID)
});
return(true);
}
}
}
MessageHeader messageIdHeader = headers.GetFirstOrDefault("Message-ID");
if (messageIdHeader != null && messageIdHeader.Value.Length > 33)
{
string tmp = messageIdHeader.Value.Substring(1, 32);
Guid messageID;
if (Guid.TryParse(tmp, out messageID))
{
int internalSendID = -1;
string rcptTo = string.Empty;
tmp = ReturnPathManager.GetReturnPathFromMessageID(messageID);
if (ReturnPathManager.TryDecode(tmp, out rcptTo, out internalSendID))
{
// NEED TO LOG TO DB HERE!!!!!
Sends.Send snd = MantaMTA.Core.DAL.SendDB.GetSend(internalSendID);
Save(new MantaAbuseEvent
{
EmailAddress = rcptTo,
EventTime = DateTime.UtcNow,
EventType = MantaEventType.Abuse,
SendID = (snd == null ? string.Empty : snd.ID)
});
return(true);
}
}
}
return(false);
}
;
// Step 2: AOL give redacted Abuse Reports but include the original email as a bodypart; find that.
BodyPart childMessageBodyPart;
if (FindFirstBodyPartByMediaType(message.BodyParts, "message/rfc822", out childMessageBodyPart))
{
if (childMessageBodyPart.ChildMimeMessage != null)
{
if (checkForReturnPathHeaders(childMessageBodyPart.ChildMimeMessage.Headers))
{
processingDetails.ProcessingResult = EmailProcessingResult.SuccessAbuse;
return(processingDetails);
}
}
}
// Step 3: Hotmail don't do Abuse Reports, they just return our email to us exactly as we sent it.
if (checkForReturnPathHeaders(message.Headers))
{
processingDetails.ProcessingResult = EmailProcessingResult.SuccessAbuse;
return(processingDetails);
}
}
catch (Exception) { }
Logging.Debug("Failed to find return path!");
processingDetails.ProcessingResult = EmailProcessingResult.ErrorNoReturnPath;
return(processingDetails);
}
/// <summary>
/// Examines an email to try to identify detailed bounce information from it.
/// </summary>
/// <param name="filename">Path and filename of the file being processed.</param>
/// <param name="message">The entire text content for an email (headers and body).</param>
/// <returns>An EmailProcessingResult value indicating whether the the email was
/// successfully processed or not.</returns>
public EmailProcessingDetails ProcessBounceEmail(string message)
{
EmailProcessingDetails bounceDetails = new EmailProcessingDetails();
MimeMessage msg = MimeMessage.Parse(message);
if (msg == null)
{
bounceDetails.ProcessingResult = EmailProcessingResult.ErrorContent;
bounceDetails.BounceIdentifier = Core.Enums.BounceIdentifier.NotIdentifiedAsABounce;
return(bounceDetails);
}
// "x-receiver" should contain what Manta originally set as the "return-path" when sending.
MessageHeader returnPath = msg.Headers.GetFirstOrDefault("x-receiver");
if (returnPath == null)
{
bounceDetails.ProcessingResult = EmailProcessingResult.ErrorNoReturnPath;
bounceDetails.BounceIdentifier = Core.Enums.BounceIdentifier.UnknownReturnPath;
return(bounceDetails);
}
string rcptTo = string.Empty;
int internalSendID = 0;
if (!ReturnPathManager.TryDecode(returnPath.Value, out rcptTo, out internalSendID))
{
// Not a valid Return-Path so can't process.
bounceDetails.ProcessingResult = EmailProcessingResult.ErrorNoReturnPath;
bounceDetails.BounceIdentifier = Core.Enums.BounceIdentifier.UnknownReturnPath;
return(bounceDetails);
}
MantaBounceEvent bounceEvent = new MantaBounceEvent();
bounceEvent.EmailAddress = rcptTo;
bounceEvent.SendID = MantaMTA.Core.DAL.SendDB.GetSend(internalSendID).ID;
// TODO: Might be good to get the DateTime found in the email.
bounceEvent.EventTime = DateTime.UtcNow;
// These properties are both set according to the SMTP code we find, if any.
bounceEvent.BounceInfo.BounceCode = MantaBounceCode.Unknown;
bounceEvent.BounceInfo.BounceType = MantaBounceType.Unknown;
bounceEvent.EventType = MantaEventType.Bounce;
// First, try to find a NonDeliveryReport body part as that's the proper way for an MTA
// to tell us there was an issue sending the email.
BouncePair bouncePair;
string bounceMsg;
BodyPart deliveryReportBodyPart;
string deliveryReport = string.Empty;
if (FindFirstBodyPartByMediaType(msg.BodyParts, "message/delivery-status", out deliveryReportBodyPart))
{
// If we've got a delivery report, check it for info.
// Abuse report content may have long lines whitespace folded.
deliveryReport = MimeMessage.UnfoldHeaders(deliveryReportBodyPart.GetDecodedBody());
if (ParseNdr(deliveryReport, out bouncePair, out bounceMsg, out bounceDetails))
{
// Successfully parsed.
bounceEvent.BounceInfo = bouncePair;
bounceEvent.Message = bounceMsg;
// Write BounceEvent to DB.
Save(bounceEvent);
bounceDetails.ProcessingResult = EmailProcessingResult.SuccessBounce;
return(bounceDetails);
}
}
// We're still here so there was either no NDR part or nothing contained within it that we could
// interpret so have to check _all_ body parts for something useful.
if (FindBounceReason(msg.BodyParts, out bouncePair, out bounceMsg, out bounceDetails))
{
bounceEvent.BounceInfo = bouncePair;
bounceEvent.Message = bounceMsg;
// Write BounceEvent to DB.
Save(bounceEvent);
bounceDetails.ProcessingResult = EmailProcessingResult.SuccessBounce;
return(bounceDetails);
}
// Nope - no clues relating to why the bounce occurred.
bounceEvent.BounceInfo.BounceType = MantaBounceType.Unknown;
bounceEvent.BounceInfo.BounceCode = MantaBounceCode.Unknown;
bounceEvent.Message = string.Empty;
bounceDetails.BounceIdentifier = Core.Enums.BounceIdentifier.NotIdentifiedAsABounce;
bounceDetails.ProcessingResult = EmailProcessingResult.Unknown;
return(bounceDetails);
}
