VirtualMin GPL 3.82.gpl, installed on an Ubuntu 10.4 server.
I’ve got two domains who like to use the mailing list team@example1.com and team@example2.com
First created team@example1.com with no problem.
Then when attempted to create team@example2.com, got the following error:
“Failed to create mailing list : A list with the same name already exists”
I think this is a Mailman thing… Mailing lists are identified by their name part before the @, which must be unique. The part after the @ is just the mail server where the list currently happens to be hosted, and which can change too.