By looking at the headers *very carefully* you should be able to determine if the LISTSERV's mail client, as opposed to the poster's mail client, is resending.  It may help to have the very original list distrbution to compare against the duplicate's headers.

Having no explicitly defined LOOPCHECK= is the default and is the best anti-loop settings for a "normal" list e.g., the default may not be appropriate if the list is the target of legit. automation messages.

At 09:53 3/31/2006 Friday, Eggleston Scott wrote:
>I have checked the headers of the resent messages
>and they have a sent date/time stamp of a few days before
>the received data/time stamp.
>
>It appears to be resending the original messages out.
>
>I am a novice with List server and Mail relaying in general.
>
>I assume the loopcheck parms will configured on our relays ?