We are having problems receiving mail on our server running Postfix. Does anyone have any suggestions into settings we should look for? I know this is kind of a vague question but I'm sure that people have had problems with it in the past, and if you can guide us in the right direction we sure would appreciate the help.
A little clarification -- we're able to send emails outside of the network, and we also receive mail from each other within the network. We just can't seem to receive mail from outside the network.
A few minutes after I posted the first message, I discovered that Postfix was not running -- it seems to spontaneously quit every once in awhile, and when I tried to restart it the first time, Webmin said "Postfix start failed" ... when I tried a second time, it successfully started.