[Mailman-Users] Why host_name and not domain?

Hello,

why I get as a subscriber a hostname and not an right email address?

I think, it is not good to answer with e.g. "Willkommen auf der Mailingliste %(real_name)s@%(host_name)s!" Why host_name??? host_name is not the domain! host_name is only the FQDN of the Server, but no domain.

This welcome email to the subscriber is going out of our LAN and the subscriber see the internal server name of mailman!!

And a mailing list isn't a 'name -at- Servername' but 'name -at- domain' !!

Not: name@mail.intern.company.de Right: name@company.com !!

How can I configure mailman???

I need help.

Thanks a lot, Oliver