Was just notified about this... I thought that the Message-Id is set by Exim but perhaps someone here can tell me where to start looking? I use the Archiveopteryx smtp submit feature so I'm looking here first...

------- Forwarded message -------
From: "Peter Jeremy" <[email protected]>
To: "Mark Felder" <[email protected]>
Cc:
Subject: Re: Enable UNMAP in ZFS
Date: Fri, 18 Jan 2013 15:44:37 -0600

Hi Mark,

On 2013-Jan-18 09:16:50 -0600, Mark Felder <[email protected]> wrote:
To: [email protected],
       Karim Fodil-Lemelin <[email protected]>
Subject: Re: IBM blade server abysmal disk write performances
References: <CAA3ZYrB+4LU=yrqsvyb19se9ywjejyp7gc4j8fptgx2lazm...@mail.gmail.com>
       <[email protected]>
Date: Fri, 18 Jan 2013 09:16:50 -0600
From: Mark Felder <[email protected]>
Message-Id: <[email protected]>
In-Reply-To: <[email protected]>

On 2013-Jan-18 09:16:50 -0600, Mark Felder <[email protected]> wrote:
To: [email protected], Dani <[email protected]>
Subject: Re: Enable UNMAP in ZFS
References: <CAAOK-NAnzq=iUnygw=lmxt3ruhzsm7h+wo2wuoukzvb7k1j...@mail.gmail.com>
Date: Fri, 18 Jan 2013 09:16:50 -0600
From: Mark Felder <[email protected]>
Message-Id: <[email protected]>
In-Reply-To: <CAAOK-NAnzq=iUnygw=lmxt3ruhzsm7h+wo2wuoukzvb7k1j...@mail.gmail.com>

You have a very badly broken email system.  The 'Message-Id' field is
supposed to be globally unique and is used to manage threading by some
MUAs - and I usually delete "duplicate" messages.  The above two
messages have the same Message-Id and Date but completely different
contents and addressees.  Could you please investigate the problem.

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