postfix with mailman mailer-daemon problem

Hello all, Managed to get my mail server running, it serves 6 domains , mydomain.(.net, .com, and .co.za) and lists.mydomain.(.net, .com, and .co.za) These are setup as relay domains, so for instance, anything sent to mydomain.net goes to another mail server via smtp, and anything sent to l

postfix server with no local accounts

mydomain.com and mydomain.net to be aliased or relayed to another mail server/email address. How can I set this up? I tried using virtual_alias_domains? Kind regards, Coert Waagmeester