[ubuntu] Postfix/Dovecot cannot send or receive mail.

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http://ubuntuforums.org – I am attempting to set up an email server using Postfix and Dovecot. Both services are starting fine, but when I log into Squirrelmail to send a test email it won't send, and the response from server error is blank. I tried setting up Thunderbird for the test account, and Thunderbird could not detect the server settings, so I tried to put them in manually, and it still wouldn't work. I'm extremely new to mail servers in Linux, so I have no clue as to what could be going on. My dovecot.conf -n looks like this: Code: # 2.0.19: /etc/dovecot/dovecot.conf # OS: Linux 3.2.0-30-generic x8 (Hardware)