Does mailman provide a way for a website to offer Hotmail-style web-based e-mail to its users? That would be a very useful feature, i my opinion. I have been looking for such a (free) tool, but there doesn't seem to be one available.

actually, it's pretty funny, but there's a product called Mailman that does just that. It looks just like the yahoo mail or excite mail, and i found it by searching for mailman on excite. It's fully customizable and is written in perl.