Mailgust is three softwares in one:
- Mailing list manager
- Newsletter distribution tool
- Message Board
This is much better than a hodgepodge of phpBB, M2F and listserv applications. Instead, Mailgust combines these exactly into the way you are looking for. They have a great support forum in case you encounter any snags.
Their site is currently:
http://mailgust.phpoutsourcing.com/
But will soon be:
htttp://www.mailgust.org/
(If you don't see this site up, they may be in the middle of the transition which is supposed to be any week now.)