[Mailman-Users] strange problem

[Bruce Harrison]

All of a sudden it seems that mailman is adding an address to the CC field.  It's a bad address, of the form xxxxxx at mailman.utm.edu (this is our mailman box).
It's happened to a couple of people, posting to different lists.  It's normally a first name like Thomas at mailman.utm.edu
I don't see anything in the mailman logs and SOMETIMES do see it in the /var/log/maillog file (but not always).
Crazy behavior...
We're at version 2.1.7
I've restarted the box in hopes it'll help.  No changes have been made to mailman in months.

Bruce Harrison
UT Martin