Christian H. Kuhn via Mailman-users writes:

 > i got mailman-web up and runnung.

Is this a system package, or did you use the "Virtualenv install"
(https://docs.mailman3.org/en/latest/install/virtualenv.html)?

 > Wanted to registrate the main user. Got an error ("Bei der
 > Verarbeitung Ihrer Anfrage ist ein Fehler aufgetreten.").

Google says that means "An error occurred while processing your
request."  That's not a Postfix-like error message.  Rather, that
looks like a webserver.  Did you try to register the "main user" in
Postorius?  Or in some web interface to your mail server?

What do you mean by "main user"?  The site administrator, also called
the superuser?  I don't think you can register "the" superuser through
the web.[1]  You need to use

    sudo -u mailman mailmanweb createsuperuser

or similar.  (If you are using a system package manager rather than
pip, it would usually prompt you to do this.)

 > In the logs of postfix, i could see the connection from mailman to
 > postfix, but no mail was transmitted to postfix.

It's always helpful to post the full log message.  If you're concerned
about security/privacy, you can redact hostnames and mailaddresses
(but say what was redacted, and be prepared to answer questions about
the redacted text).

Did you send mail through a list?  If not, why were you looking in the
Postfix logs?  It seems possible that some Mailman process raised an
exception (a backtrace should be logged in error.log, mailmanweb.log
or mailman.log), and tried to report to the site owner by email, but
the address was unknown to Postfix.

Without more information it's hard to way what you need to do.


Regards,
Steve



Footnotes: 
[1]  Once you have a superuser, it is possible to create additional
superusers.  But it is not possible to do that for the first one.

-- 
GNU Mailman consultant (installation, migration, customization)
Sirius Open Source    https://www.siriusopensource.com/
Software systems consulting in Europe, North America, and Japan
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