[Fwd: Delivery Status Notification (Failure)]

I can't find an address to complain about the mailing list itself, so apologies but I'm posting directly to this list. Every time I post to this group, I get returned mails about OTHER subscribers' invalid accounts, like the one below. What's up? This seems to be a new phenomenon. Should the postmaster(at)postgresql(dot)org be getting these and discarding them?

Thanks,
Craig

-------- Original Message --------
Subject: Delivery Status Notification (Failure)
Date: Wed, 12 Jul 2006 13:15:16 -0400
From: postmaster(at)usaemail(dot)enpocket(dot)com
To: cjames(at)modgraph-usa(dot)com

This is an automatically generated Delivery Status Notification.

Delivery to the following recipients failed.

martin(at)usaemail(dot)enpocket(dot)com