Recently I did some work on receiving MIME or NOT-MIME encoded Messages.
Some interesting facts:
- It is possibly to get encoded Emails (including Email Headers) via PassTrough Pipeline from a POP3 Mailbox and save them to the file system. (don't forget to disable the mime decoder that is integrated in the POP3 adapter)
- One can easily read these "raw" Emails from the file system and send them to subscribers. Only a pipeline is needed with a MIME decoder and a ContextProperty should be set: CopyMailHeadersToContext to the value 3.
The following to links helped me with my work:
http://connectedthoughts.wordpress.com/2009/08/12/receiving-mime-encoded-email-files-and-a-hidden-pop3-context-property/
http://blogs.msdn.com/b/richardbpi/archive/2006/02/03/524484.aspx