// sends a single part mail to the server
private void SendSinglepartMail(MailMessageWrapper msg)
{
// write the header
smtp.WriteHeader(msg.Header);
// send the mail body
smtp.WriteBytes(msg.BodyEncoding.GetBytes(msg.Body));
}
public void Send(MailMessageWrapper msg)
{
if (msg.From == null)
{
throw new SmtpException("From property must be set.");
}
if (msg.To == null)
{
if (msg.To.Count < 1)
{
throw new SmtpException("Atleast one recipient must be set.");
}
}
// start with a reset incase old data
// is present at the server in this session
smtp.WriteRset();
// write the mail from command
smtp.WriteMailFrom(msg.From.Address);
// write the rcpt to command for the To addresses
foreach (MailAddress addr in msg.To)
{
smtp.WriteRcptTo(addr.Address);
}
// write the rcpt to command for the Cc addresses
foreach (MailAddress addr in msg.Cc)
{
smtp.WriteRcptTo(addr.Address);
}
// write the rcpt to command for the Bcc addresses
foreach (MailAddress addr in msg.Bcc)
{
smtp.WriteRcptTo(addr.Address);
}
// write the data command and then
// send the email
smtp.WriteData();
if (msg.Attachments.Count == 0)
{
SendSinglepartMail(msg);
}
else
{
SendMultipartMail(msg);
}
// write the data end tag "."
smtp.WriteDataEndTag();
}
public void Send(MailMessage message)
{
EsmtpClient smtp = new EsmtpClient(smtpServer, username, password, use_ssl);
// wrap the MailMessage in a MailMessage wrapper for easier
// access to properties and to add some functionality
MailMessageWrapper messageWrapper = new MailMessageWrapper(message);
smtp.Send(messageWrapper);
smtp.Close();
}
// sends a multipart mail to the server
private void SendMultipartMail(MailMessageWrapper msg)
{
// generate the boundary between attachments
string boundary = MailUtil.GenerateBoundary();
// set the Content-Type header to multipart/mixed
string bodyContentType = msg.Header.ContentType;
msg.Header.ContentType =
System.String.Format("multipart/mixed;\r\n boundary={0}", boundary);
// write the header
smtp.WriteHeader(msg.Header);
// write the first part text part
// before the attachments
smtp.WriteBoundary(boundary);
MailHeader partHeader = new MailHeader();
partHeader.ContentType = bodyContentType;
smtp.WriteHeader(partHeader);
// FIXME: probably need to use QP or Base64 on everything higher
// then 8-bit .. like utf-16
smtp.WriteBytes(msg.BodyEncoding.GetBytes(msg.Body));
smtp.WriteBoundary(boundary);
// now start to write the attachments
for (int i = 0; i < msg.Attachments.Count; i++)
{
MailAttachment a = (MailAttachment)msg.Attachments[i];
FileInfo fileInfo = new FileInfo(a.Filename);
MailHeader aHeader = new MailHeader();
aHeader.ContentType =
String.Format(MimeTypes.GetMimeType(fileInfo.Name) + "; name=\"{0}\"", fileInfo.Name);
aHeader.ContentDisposition =
String.Format("attachment; filename=\"{0}\"", fileInfo.Name);
aHeader.ContentTransferEncoding = a.Encoding.ToString();
smtp.WriteHeader(aHeader);
// perform the actual writing of the file.
// read from the file stream and write to the tcp stream
FileStream ins = fileInfo.OpenRead();
// create an apropriate encoder
IAttachmentEncoder encoder;
if (a.Encoding == MailEncoding.UUEncode)
{
encoder = new UUAttachmentEncoder(644, fileInfo.Name);
}
else
{
encoder = new Base64AttachmentEncoder();
}
encoder.EncodeStream(ins, smtp.Stream);
ins.Close();
smtp.WriteLine("");
// if it is the last attachment write
// the final boundary otherwise write
// a normal one.
if (i < (msg.Attachments.Count - 1))
{
smtp.WriteBoundary(boundary);
}
else
{
smtp.WriteFinalBoundary(boundary);
}
}
}
