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I've been having a problem (using 2.0beta2) with a number of bounce messages going back to the poster rather than the list owner. I've tracked it down to the envelope sender being left as the poster, and not being changed to the list admin address. It appeared to be inconsistent since some MTAs were handling Errors-To, which was being set to the admin address, while some use the envelope sender.
The change is on line 91 of Handlers/Sendmail.py, where msg.GetSender needs to become mlist.GetAdminEmail.
 I don't know if this is also a problem in the direct SMTP module. I'm using Sendmail.py because my MTA is sendmail, but I'm using postfix in outgoing only configuration for the list delivery since mailman was getting sendmail to send each message as one huge batch of addresses.