In the wake of a new bug in sendmail, I've switched Wikipedia's mail daemon from sendmail to postfix. It shouldn't act any different as far as us humans can see, and any mail sendmail was trying to deliver should still go through.
There were a couple minutes where the mailing lists wouldn't have worked as I was switching things over, but I didn't see anyone else try to send through them during that time so hopefully there's no problem. :)
-- brion vibber (brion @ pobox.com)