[Mailman-Users] Messages are lost...I have followed FAQs 3.14

[Chuck Vohs]

I have followed the steps (great job BTW) at 
http://www.python.org/cgi-bin/faqw-mm.py?req=show&file=faq03.014.htp and 
I can't find the solution.

I have mailman version 2.1.6 installed with cPanel on RH 7.3, sending 
mail through exim.
I have several lists running.  All used to work just fine.  Last week, 2 
lists stopped sending mail.  Each responds to commands, but posts are 
just not sent.
I can't see where they are dying at.
Messages sent to the lists by nonmembers are held as pending, and I get 
an email to approve or reject.  When I approve, the message is never sent.
Very weird.
Any help, please?
Chuck