Bruce,

Usually when I see this, an external mail server is restoring email by
redelivering on the To: line instead of just the local recipient on the
smtp level, and that of course sends the mail back to the listserv for
everyone to get it again.

What you should do to verify is look at the *full* headers of the
duplicates, specifically for a common domain source before it's
received by the listserv. And of course date and time stamps will
reflect it sat there for a day.

-Jim

--
Jim Serwinowski                 [log in to unmask]
UB Listserv Administrator       http://listserv.buffalo.edu


On Wed, 4 Mar 2009, Goll,Bruce wrote:

> Date: Wed, 4 Mar 2009 14:17:43 -0500
> From: "Goll,Bruce" <[log in to unmask]>
> Reply-To: LISTSERV site administrators' forum <[log in to unmask]>
> To: [log in to unmask]
> Subject: Duplicate Messages
>
> For some reason today one of our lists is resending all of the messages
> it already delivered yesterday.  In some cases some messages are being
> sent multiple times, but not all messages from the list.  Subscribers
> (4000+) are finding this to be quite annoying.  Messages all have
> yesterdays time stamp and date that the original messages had when first
> posted.  Any idea what might be causing this to happen?  I have had this
> happen to different lists at different times over the past few years but
> have never been able to pinpoint a cause for the problem.  It always
> stops sending duplicates on its own but has never resent the previous
> days postings, has always been the current days postings that were going
> out as duplicates.
>
>
>
> Any assistance or ideas would be greatly appreciated.
>
>
>
> Thanks
>
> Bruce
>
>
>
> ********************
>
> Bruce E. Goll
>
> Sr. Systems Engineer
>
> OCLC, Inc.
>
> 6565 Kilgour Place
>
> Dublin, OH 43017
>
> Office: 614-764-6224
>
> Mobile: 614-783-6693
>
> Fax: 614-718-7060
>
>
>
>
>