Unless he sisnt' send two copies just now, it's his system.  I got one from 
the following received header path (minus the LSOFT paths):

Received: from 212.137.44.177 by WALNUT.EASE.LSOFT.COM (SMTPL release 1.0m)
          with TCP; Fri, 31 Mar 2006 09:23:39 -0500
Received: from avas-checker by relay-outbound-2 with esmtp (Relay-Software
          4.52) id 1FPKXL-0005ds-6Y for [log in to unmask]; Fri, 
31
          Mar 2006 15:23:39 +0100
Received: from relay.nhs.uk by rlavas02 with ESMTP id ASD11721; Fri, 31 Mar
          2006 15:23:38 +0100 (BST)
Received: from [10.49.11.50] (helo=byland) by relay-inbound-3 with esmtpa
          (Relay-Software 4.52) id 1FPKXK-0002gI-AN for
          [log in to unmask]; Fri, 31 Mar 2006 15:23:38 +0100
Received: from sout1lds.nhs.uk ([192.168.112.86]) by byland with Microsoft
          SMTPSVC(6.0.3790.1830); Fri, 31 Mar 2006 15:24:06 +0100
Received: from exchpe.nhsia.nhs.uk ([10.149.115.48]) by sout1lds.nhs.uk with
          Microsoft SMTPSVC(6.0.3790.1830); Fri, 31 Mar 2006 15:23:37 +0100


And the other from this path:

Received: from 212.137.44.177 by WALNUT.EASE.LSOFT.COM (SMTPL release 1.0m)
          with TCP; Fri, 31 Mar 2006 07:43:55 -0500
Received: from avas-checker by relay-outbound-1 with esmtp (Relay-Software
          4.52) id 1FPIyo-0007gH-5m for [log in to unmask]; Fri, 
31
          Mar 2006 13:43:54 +0100
Received: from relay.nhs.uk by rlavas01 with ESMTP id ASI72743; Fri, 31 Mar
          2006 13:43:54 +0100 (BST)
Received: from [10.49.11.50] (helo=byland) by relay-inbound-6 with esmtpa
          (Relay-Software 4.52) id 1FPIyo-0007UJ-JY for
          [log in to unmask]; Fri, 31 Mar 2006 13:43:54 +0100
Received: from sout2lds.nhsia.nhs.uk ([192.168.112.87]) by byland with
          Microsoft SMTPSVC(6.0.3790.1830); Fri, 31 Mar 2006 13:44:22 +0100
Received: from exchpe.nhsia.nhs.uk ([10.149.115.48]) by 
sout2lds.nhsia.nhs.uk
          with Microsoft SMTPSVC(6.0.3790.1830); Fri, 31 Mar 2006 13:43:53 
+0100

Looks like that first exchange server is duplicating the message or his MUA 
is.

--On March 31, 2006 9:32:27 AM -0500 Pete Weiss <[log in to unmask]> wrote:

> Are they *actually* being distributed again by the list?
>
> If so, what are your LOOPCHECK= parms?
>
> It may be necessary to have subscribers self-moderate, or a list-moderator
>
> it may be that that a subscriber's MUA or possibly MTA is effectively
> resending the original
>
> It is really really necessary to see complete RECEIVED headers to start
> to hone in of the problem.
>
> /Pete Weiss
>



--
"Genius might be described as a supreme capacity for getting its possessors
into trouble of all kinds."
-- Samuel Butler