My scenario: I have a lot of postfix servers, each one, use to sent mail directly to internet, so It's difficult to monitor them. What I want?
Put all postfix's of my servers to send all their external mail to an smarthost server in my network. I mean, the smarthost must receive ONLY mail from my servers and relay them mail to internet. Remember I have a lot of different servers and domains so I don't know how to configure this smarthost becasuse in some way it's becoming an open relay. My question: How can I setup a secure smarthost to my network that receive mail ONLY from my servers and relay all mail directly to Internet? Include some configuration if possible. regards, Israel.