Hi I am trying to make a SMTP filter that would redirect all SMTP traffic coming from the intranet (except from the Exchanger server) to the Exchange server. Reason being I want to restrict only Exchange server to be able to send mails (for tracking purposes). I also don't want to configure other SMTP servers individually to relay to exchange server. Just wanted to know if someone has made such/similar application filter using ISA SDK. Thanks Nitin