Hier noch ein paar LInke wo Du evtl. fündig werden kannst.
Writing Managed Sinks for SMTP and Transport Events
http://www.microsoft.com/downl…7c214e1d0b&DisplayLang=en
Writing Managed Sinks for SMTP and Transport Events
http://msdn.microsoft.com/library/ en-us/dnsmtps/html/writingmngsinks.asp
Exchange SDK
http://msdn.microsoft.com/exchange
http://msdn.microsoft.com/down…/834/msdncompositedoc.xml
http://msdn.microsoft.com/down…/833/msdncompositedoc.xml
http://msdn.microsoft.com/down…/832/msdncompositedoc.xml