postfix not receiving email from outside
I am trying to set up a postfix server on my VPS server. It was working fine when I used the default setting provided, but when I installed the POP/IMAP service and may have changed some SMTP setting, it stopping receiving email from outside. I can send to outside and receive email from local users, but not from accounts on the internet.
It puzzled me and not sure where to exam the problem. I suspect my SMTP was messed up. I used telnet to connect to my port 25, got initial response of (Escape character is '^]'.) and then no more response. Did not know what was wrong. The funny thing is my POP server is still running smoothly and I can get email to my PC.
Any help will be highly appreciated!