I'm not sure if I configured mailman the correct way? I can't find any documentation on this topic on the virtualmin website. I configured mailman using the official documentation. I stopped at http://www.gnu.org/software/mailman/mailman-install/postfix-virtual.html because I'm not sure if this is needed when I use virtualmin. I can create mailing list but when I try to add a mailing list to a new domain with the same name as a mailing list in another domain I get this message:
Failed to create mailing list : A list with the same name already exists
So I think the virtual hosts in mailman are not set up correctly. Do you have any guidelines on how to do this.