Postfix/Courier mail server Error Connecting

Discussion in 'Server Operation' started by tempomental, Jan 24, 2013.

  1. tempomental

    tempomental New Member

    I've got some small domain names that I host on my home server and would like to get some basic email addresses for those domains. I set up an Ubuntu 12.04 server and followed the instructions here for setting up a mail server with Postfix and Courier: (top rated answer)

    After doing all that, I attempted to set up my [email protected] email address in Thunderbird, but it can't find the server.

    I'm able to telnet into port 25 locally (i.e. telnet 25) and send myself a test message manually, but I can't telnet into port 25 from another computer. My ISP has informed me that they do not block any ports. returns the following information about my mail server: There was a problem while talking with the mail server. Got 'ConnectException: Connection refused'

    nmap -p 25 yields the following:
    PORT STATE SERVICE 25/tcp filtered smtp

    What are my next steps to troubleshoot/resolve this? I'm at a dead end.

  2. falko

    falko Super Moderator ISPConfig Developer

    What are the outputs of
    netstat -tap
    iptables -L

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