Ok here is the problem. My postfix server is the front end for 2 exchange servers running Symantec Mail Security with spam filtering. The most important thing is to cut down the spam as much as possible. We go to great pains to maintain a proper list of recipients so we don't have "User Unknown"...
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.