> But if you're using the SMTP proxy, then where else can > you catch this? If someone tries to bounce spam off the > GNAT Box SMTP server, the mail server never knows...
GNAT Box is not an SMTP server. It can't handle messages by itself. Everything that it accepts after applying its own anti-spam rules (reverse DNS check, MX check, MAPS check, etc.) gets passed to the internal mail server, regardless of the ulitmate destination address. If you're using the "Accept only these domains" feature or the MX check feature, then you're preventing relaying right there. Your internal mail server may (and probably should) even go beyond that. -- Alex Howansky Wankwood Associates http://www.wankwood.com/
