Hi everyone,
First off, my apologies if this topic has been address before. I've been searching in google for days now and had mixed results in finding answers to my questions. To put it simply, I have installed postfix on a system running ubuntu 9.04. I would like to configure it as a front-end server for my exchange environment. The server would reside in the DMZ of my network. The server would accept emails from the internet and relay messages destined for valid recipients to the exchange server on my intranet. At this point I'm comfortable updating the recipient tables manually. I'm having mixed results getting this to work. My postfix server accepts emails and relays them to the exchange server just fine, however it also seems to have no issues relaying emails to gmail.com as well, so I'm not sure how to restrict it to only accepting messages destined for my domain. Any help, pointers or suggestions would be greatly appreciated. Thanks in advance.
