> On of my list owners is being plagued with "was delivered" error messages. > He has gotten at least some 20+ errors. He can't tell exactly who from or > who to or who by; the subject line to him keeps changing, the one below is: > ATKINS-NEW: error report from PROTRADER.COM. Did someone post a message > that asked for an acknowledgement that it was read? How could Listserv let > such go through? Don. The sample message you sent is a delivery receipt from Microsoft Exchange. I've seen the same effect (lots of delivery receipts from different addresses). I believe it is caused by an Exchange user requesting a delivery receipt for a message sent to the list. The request is buried in the base64 encoded MS-TNEF file, which LISTSERV does not understand. You may be able to identify the culprit by looking for the original message with the subject mentioned in the delivery receipts.