Is it possible to extend the functionality of IMF? I am using Exchange 2003 SP2 and would like to use IMF as a backup to a Barracuda Spam Firewall. When the Barracuda tags spam it prepends a message on the subject line so that our users are aware that it is spam and can write rules to deal with it. IMF seems to work invisibly which on the one hand is nice but on the other is very limiting. We support users using non-ms clients (some command line, like pine) using pop and cannot deal with the "junk e-mail folder". I would like to use C# if this is possible. Thanks! bob