It sounds to me like it's someone spamming the listname-signoff or listname-unsubscribe address for the list.

There's not much the list owner can do about that short of writing an inbox filter to automatically discard these when they arrive.

Nathan

At 09:54 AM 8/29/2007 -0400, you wrote:
>Good Morning,
>
>I have been receiving a lot of complaints from a particular list owner who states that they receive 3 to 4 bounce back e-mails per day from their list. All of these bounces are sign-off requests and come back to Listserv because they are not valid addresses. Meaning Listserv tries to send the subscriber a notification saying "you are not currently subscribed to this list", however the message gets bounced because the email address doesn't even exist.
>
>As I said the owner receives 3-4 per day. Is this a spammer who is trying to send sign-off requests for random email addresses? Do you have any suggestions that I can use in order to alleviate this influx of error e-mails?
>
>Thanks in advance for your time.