I've recently decided to migrate over to Zimbra but I am running into an issue with my mailman mailling lists.
I can receive and send mail fine through the web interface.
Assuming that the hostname of my machine is server.blah.com and I have a list of firstname.lastname@example.org. Whenever I try to send to email@example.com, in the mail queue it shows up as firstname.lastname@example.org and it bounces.
I know I ran into something like this years ago but I can't remember what I did to fix it. I believe it's most like mailman making the domain/subdomain switch but I'm not 100% sure of that.