It is possible the mail is being forwarded to this provider.  Are you seeing the full headers? 
--Joe

________________________________________
From: LISTSERV list owners' forum [[log in to unmask]] on behalf of Eric Johnson [[log in to unmask]]
Sent: Wednesday, February 23, 2011 11:25 AM
To: [log in to unmask]
Subject: Re: What does this mean?

We have no accounts at this provider.

Eric Johnson