I have configured postfix on our server and it works fine on our local network. We can send & recieve, even POP3 without any problem.
However, for testing reasons I sent e-mails from outside addresses, but they are not being delivered. The log sais "Relay access is denied". I read all kinds of HOWTOs and manuals, but can't get this work.
If I set "mynetwork_style = subnet" then all mail coming from the Internet will be dropped because of "relay access is denied". If I open my postfix to the whole word by setting "mynetwork" to a stupid something that filters nothing out, then I will be the relay station of the entire world's, which I obviously do not want to be.
So, how do I make it to receive mail that comes for our domain names, and drop all the rest?