Christian H. Kuhn via Postfix-users:
> Dear Wietse,
>
> Am 20.06.2025 um 22:26 schrieb Wietse Venema via Postfix-users:
> > Christian H. Kuhn via Postfix-users:
> > I see only one inet_interfaces setting, and two differfent myhostname
> > settings. The Postfix SMTP client detects a mail loop when it
> > wants to connect to port 25 and:
> >
> > - Either the server IP address matches the client's inet_interfaces
> > setting (in this case Postfix does not even attempt to connect).
>
> This is it. But how can it be avoided in a multi instance set up, if all
> instances are running on the same server and use the same localhost? No
> IP but UNIX sockets?
Specify non-overlapping inet_interfaces settings. I mentioned that
in my earlier response.
> > Which scenario is it?
> >
> > I suggest setting inet_interfaces explcitly for both Postfix
> > instances.
Wietse
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