I have just set up mailman and done a little testing.

My companys e-mail server is on xxx.com My e-mail server and mailman is on ae-165.xxx.com.

For what ever reason, all the e-mails from the list are addressed list@xxx.com rather than list@ae-165.xxx.com. This means that I can not do a reply-to-sender, abut I have to manually input the correct e-mail address every time.

Any ideas about what I have done wrong?