mailing list with kolab

Hello,

how do I set up a mailman-style mailing list? I guess, it can be done
via the groups settings, but I am not sure what to select for my use
case.
It is a plain mailing list with a limited set of users. No (anonymous)
registration nor moderation necessary and the users will use their own mailboxes
outside my kolab server. So, really basic: they get a mail-address from
my kolab-domain-pool and mail gets distributed via that address.

thanks for advice
Thomas