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[ubuntu] Postfix refusing external connections

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http://ubuntuforums.org – I'm having issues connecting to postfix on port 25. Running telnet to port 25 from anything but the server itself, the connection times out. It was working before, and I have no idea what caused it to stop working. My main.cf: Code: # See /usr/share/postfix/main.cf.dist for a commented, more complete version # Debian specific:  Specifying a file name will cause the first # line of that file to be used as the name.  The Debian default # is /etc/mailname. #myorigin = /etc/mailname smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) biff = no # appending .domain is the M (Hardware)