Having a similar issue after completing the installation. Followed the guide about virtual users & domains with postfix, courier, MySQL & Squirrelmail mail for Ubuntu 12.10. Am able to send out email without any issues but when I attempt to reply it will be sent from the mail client without any bouncebacks but will not arrive at squirrelmail.
I have checked the mail.log and there are no error entries.
I am able to telnet to the server, able to ping the static ip address of the server. Can open the squirrelmail site. I have confirmed that the mx records point to the mail server. What am I missing?
Any help would be greatly appreciated.
A computer once beat me at chess, but it was no match for me at kick boxing.