Russ responds ...

"He has suggested the admin at the host of the list contact IBM; I'm hoping they will, and that this will solve the problem. I'd still like to have an idea how widespread the problem has been (ideally, a list of blocked users so I could email them and asked if they'd wanted to be blocked)."

It would be good if the sysadmin at the site checked, however, you may want to do some checking as well.  You might notify your Listserv site administrator about this.

If this is really peculiar to "IBM's Coboin as one of the spam filter source. " it may be a while in unraveling what is happening.  If you can get them, the SMTP logs at the site may have an explanation of what is happening.  You'll need the Message-ID of the mail in question; the sysadmins need that to search the logs.  There is always a possibility this is related to mail standards, but I thought Listserv 16.* had resolved that.

In the meantime, the suggestions regarding Auto-Delete can be useful (but you can't keep that on too long, the logs just fill up with junk).  Anyway, best of luck (these kind of things can drag on forever).
--Joe

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