[Mailman-Users] Mail Not Delivered to All List Members

[Hunter Hillegas]

Hello. We are running 2.1.1 on RH7.2.

We have a list with 27,000 members. It is an announce type list, only the
moderator posts to it.

Yesterday he posted his first message to the list.

The message was delivered to some list members but not all (for instance he
didn't get it but I did).

I am trying to troubleshoot this but I'm not sure where to start.

1. How can I tell who didn't get the message? It might help point out a
pattern.

2. Any ideas what happened?

Any help is appreciated.

Hunter