[Mailman-Users] virtual hosting tactic

[Rodrigo Borges Pereira]

Hi!

I'm running a server that hosts a few domains. I already have mailman
running for lists.mydomain.com, and it is working great.

However, now i want to give users that host domains the ability to use
lists.userdomain.com too, and each user has it's own mailman setup under his
domain.

What's the best tactic for this?

I'm using Qmail and latest Mailman.

TIA
Rodrigo