I have a couple of phpbb forums, and would like people to have the ability to post to these forums via e-mail and receive forum messages via e-mail if they so choose. In other words, I'm looking for "Yahoo Groups"-like functionality. Can Drupal do this? I'm considering installing mailman and mail2forum which, combined with the phpbb I already have installed, is supposed to do this. I've also looked into mailgust, which might work, but isn't open source. Is there a good/popular solution here? Suggestions? Opinions? Is there another open-source product that does this? (combining separate apps to perform a larger task is very Unix-y, but phpbb and mailman are both fairly complex, so a single app that does both might be more useful). I'm not married to phpbb-- my forums are small + I could easily transfer them to drupal or another app. For example, I've heard phorum has mailing list support built-in, though it doesn't quite seem to do what I want. I've seen at least a couple of discussion threads that say "It's hard to believe, but no such open-source product exists", but I don't believe them :)