I'm setting up a phpbb bulletin board on a windows machine.
It's working fine.

But I want to let users send email to a group.

EG if I have a group called "KidsJokes" I want a user to be able to email 
To: phpbb@mycompany.com
Subject: KidsJokes: subject of my post

and have the message post to the KidsJokes forum.  Sort of like Yahoo
Groups allows you to post via email but in this case there's one
address for the phpbb server and the name of the forum goes in the
subject.

There must be something available that does this for phpbb or
vBulletin.  Answer accepted for either one.  The tool needs to be able
to get email from a MSFT exchange inbox.