Duplicate key found error

Dear all,

I have one member of the list whose submissions are being quietly
dropped - nothing they send gets through.  The log shows a 'Duplicate
key found' error:

Receipt-To: -iRea	   2873
formail: Duplicate key found:<[email protected]>
formail: Duplicate key found:<[email protected]>
From [email protected] Sat Oct 19 11:39:25 2002
 Subject: Test
  Folder:  formail -R"From X-From_:" -iDate: -iReturn-Receipt-To:
-iRea	   2257

I got them to send the message to me too, and the headers are below:

X-Apparently-To: [email protected] via 216.136.226.176; 19 Oct 2002
08:39:29 -0700 (PDT)
Return-Path: <[email protected]>
Received: from 195.92.193.211 (EHLO cmailm4.svr.pol.co.uk)
(195.92.193.211) by mta537.mail.yahoo.com with SMTP; 19 Oct 2002
08:39:29 -0700 (PDT)
Received: from modem-2863.antelope.dialup.pol.co.uk ([217.134.27.47]
helo=computer) by cmailm4.svr.pol.co.uk with smtp (Exim 3.35 #1) id
182vhE-000538-00; Sat, 19 Oct 2002 16:39:24 +0100
Message-ID: <001b01c27785$7598d060$2f1b86d9@computer>
From: "xxxxxx xxxx" <[email protected]>
To: <[email protected]>
Subject: Test
Date: Sat, 19 Oct 2002 16:35:55 +0100
MIME-Version: 1.0
Content-Type: multipart/alternative;
boundary="----=_NextPart_000_0010_01C2778D.98921600"
X-Priority: 3
X-MSMail-Priority: Normal
X-Mailer: Microsoft Outlook Express 6.00.2600.0000
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000
Content-Length: 538

Could you help me diagnose why the error occurs?

many thanks

'o-Dzin




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