[Mailman-Users] serious newbie here

[Glenn English]

I've looked at the FAQ and the archives. 
Mailman version: 2.1.11, OS: Debian 5.8, MTA: Postfix 2.5.5.

One of my users sent out a mailing this morning, and 18% of them bounced. All the bounce reports (from remote MTAs) said things about bad addresses. He says this has happened before, but when he made another list, of only the bounces, a lot of them worked.

I can't think of any way this can happen. Have any of you seen something like this?

-- 
Glenn English