[Mailman-Users] Mailman repetitively trying to drop addresses

We imported about 1000 addresses from an old mailing list into a new Mailman list, and we were hoping Mailman's bounce processing would start removing any addresses that are clearly no longer valid. This is old info; if we've got a bad address, we just want it dropped without any further resuscit

[Mailman-Users] Adding a description to the "-bounces" address

This seems like such a simple thing that I'm sure it's described somewhere, but after searching the archives and Google I haven't had any success in finding it. We have some Outlook users, and as this FAQ describes... http://wiki.list.org/display/DOC/From+field+displayed+by+Microsoft+Outlook