I have apache2 running a few virtual hosts. Each of my websites is working properly. I installed Postfix / Dovecot / MySQL and I can create the domains and users in it's database and everything works. What I'd like to change though is that all my domains must use the same POP3 and SMTP servernames (mail.maindomain.com). I'd like to allow each domain to use it's own servername (mail.otherdomain.com)
How do I do that?