Just some links that help with programming SMTP Sinks for IIS.
- SMTP Server Technical Articles Microsoft Windows 2000 SMTP Service Events
<http://msdn.microsoft.com/en-us/library/ms998608.aspx> - How to write an OnArrival-type SMTP event sink in managed code by using Visual Studio .NET 2003
<http://support.microsoft.com/kb/894286> - Managed IIS SMTP Sink Wrapper: Message.CopyContentToStream
<http://codeka.com/blogs/index.php/2005/06/06/managed_iis_smtp_sink_wrapper_message_co> - C# Catchall Onarrival Event sink
<http://gsexdev.blogspot.com/2005/05/c-catchall-onarrival-event-sink.html> - ESTMP Keywords and Verbs (commands) Define
<http://smtpfilter.sourceforge.net/esmtp.html> - How to get the IP of the SMTP client
<http://codeka.com/blogs/index.php/2007/08/08/how_to_get_the_ip_of_the_smtp_client> - Sample Sink
<http://svn.vestris.com/filedetails.php?repname=Vestris+SVN&path=%2Fsncore%2FSnCore.MailSink%2FSnCore.DomainMail%2FSink.cs&rev=1289 > - Creating a custom authentication sink for IIS SMTP or Exchange
<http://blog.rednael.com/2008/08/13/CreatingACustomAuthenticationSinkForIISSMTPOrExchange.aspx>