I setup the Ubuntu 10.04 Server, Apache / Postfix / Dovecot / Squirrelmail, everything is ok except receiving emails from outside:
squirrelmail send emails to outside - OK
Outside (e.g. yahoo, gmail) send email to my email server - not OK
For example, I use Yahoo send testing email to my email server, but bounce back and got following error message:
Remote host said: 554 5.7.1 <xxxxx@<mydomain>.com>: Relay access denied [RCPT_TO]
Is there any settings I need to change in Postfix or squirrelmail?