On Thu, 9 Apr 2015 12:47:15 +0200 Peter Ulrich Kruppa wrote:

  [ ... ]

>       Yes: when I use telnet on port 25 from my Fedora I get
>          # telnet localhost 25
>         Trying ::1...
>         telnet: connect to address ::1: Connection refused
>         Trying 127.0.0.1...
>         Connected to localhost.
>         Escape character is '^]'.
>         220 pukruppa.de ESMTP

Ok, let's test.

# host -t mx pukruppa.de
pukruppa.de mail is handled by 10 mail.pukruppa.de.
# telnet mail.pukruppa.de 25
Trying 217.92.171.227...
telnet: connect to address 217.92.171.227: Connection timed out

There is no SMTP daemon listening for the outside world.
I guess the missing port forwarding ist the problem.


--Frank
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