[Mailman-Users] Unsubscribed members still getting emails.

[Stephen J. Turnbull]

Colin writes:

 > Three members left my mailing list over a year ago and they stopped getting
 > messages. Suddenly last week all 3 started getting emails again. Their email
 > addresses are not in the membership list. I have not made any changes to the
 > list. 

Are they current messages?  Mail can sit in a queue somewhere for a
*very* long time, and then somebody gives it a kick and it suddenly
appears in somebody else's mailbax.

Are they at the same domain?