Ask HN: Best listserv setup?

Howdy all, I'm currently using GoogleGroups for a listserv, but I'm a bit frustrated by the whole Google account thing for sign-ups - I would rather be able to just add their e-mail to a DB. Does anyone have experience with alternative listservs? This wouldn't be a newsletter, per se, as anyone in the group would be able to send emails to the list. Ideally, the contents of the e-mails would be backed up automatically, and, if possible, viewable online through some sort of feed. Thanks so much! Josh