[Mailman-Users] Sender and receiver question

[Bartosz Jozwiak]

Hello,

Could somebody explane me why this happens and how I can fix it.

I have set up Mailman on server "bartek.parbo.net".
I have also creates mailing list under virtual domain for example :
news.rpbg.net

When I receive posts to mailing list sender is: xpo at news.rpbg.net and
receiver is xpo at bartek.parbo.net
Can that be change to sender: xpo at news.rpbg.net and receiver also
xpo at news.rpbg.net ??

Thank you for any sugestuions and advice.

Bartek