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Re: External connection to Postfix problem

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  • Wietse Venema
    ... This confirms that Postfix accepts network connections, and that the problem is outside of Postfix. It could be any of: - Incorrect default route
    Message 1 of 5 , Jun 20, 2013
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      Wietse:
      > Report the output from "telnet postfix-ip-address 25" from a
      > different machine on your local network.

      Gary Brinker:
      > The output from the internal address is the 250 greeting banner
      > and using the external IP is could not open connection : connection
      > failed Gary

      This confirms that Postfix accepts network connections, and
      that the problem is outside of Postfix.

      It could be any of:
      - Incorrect default route configured on the Postfix host
      - Incorrect firewall configuration on the Postfix host
      - Incorrect LAN router configuration (NAT/forwarding)
      - Conflict with ISP-side configuration
      - ....

      This is a matter of systematic trouble shooting, or random experiments
      and dumb luck.

      Wietse
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