Christoph Pleger:
> Hello,
>
> I have here two different postfix installations, one is postfix 2.11.3-1
> from Debian 8, the other is postfix 3.1.0-3 from Ubuntu 16.04.
> /etc/postfix/main.cf is the same on both machines, mydomain and
> myhostname are not set in main.cf . When I call postconf, I get
>
> mydomain = cs.uni-dortmund.de
> myhostname = cloudhost177.cs.uni-dortmund.de
>
> on the Debian machine, but
>
> mydomain = localdomain
> myhostname = cloudhost176.localdomain
>
> on the Ubuntu machine.
>
> What are the possible reasons for that? I cannot find out why the Debian
> postfix finds the domain information, but the Ubuntu postfix does not.
'localdomain' is the Postfix built-in default domain name when the
machine name is not in 'host.domain' form.
Wietse
