I have a server running Virtualmin PRO with main domain A.com. I then created a mailing list called mlist@B.com on the virtual domain B.com (on the same server).
Aliases for this list exist in /etc/aliases but any message sent to it bounces back with a "No Such User Here" message. However, if I send the message to mlist@A.com, it DOES work. So something is wrong with the aliases I think, but what?