Mime types and C#

Hiya

We're writing a big app in c# and are integrating emails into it.
Managed to get so far but I'm having trouble with MIME encrypted mails.

C# has nice functions and classes to deal with SENDING emails including setting the mime type of the body However C# doesn't has anything for receiving emails! (lil buggers!) I have therefore been writing all of this myself.

So the question is......
How do I decode MIME encrypted emails?

thanks a lot

Mitchell