I need to replace or rebuild our old mail list server. This isn't a high volume list server and we are hoping to replace it with a free or OSS solution. I've setup mailman before, but it is starting to show it's age in a bad way. One of the requirements is a web based management utility as we are hoping to delegate the management of individual lists off to different people. We are a mixed Windows + Linux shop, but would strongly prefer the latter.
Does anyone have any recommendations?
Edit: I guess I should have made this a bit clearer. I am looking for mailing list software not an announcement system. It should support discussion lists.