[Dovecot] Removal of mailist duplicates?

[Peter Bell]

On Thursday, 16 June, 2011 07:38 PM, Charles Marcus wrote:
> On 2011-06-16 7:38 AM, Ron Leach wrote:
>> I usually reply (all) to lists AND suppress the copy going to the OP.
>
> I used to have to do that, so I sure was glad when Thunderbird
> implemented the Reply-To-List function... now I just press CTRL-SHIFT-L,
> and if nothing happens I know the list is one of the brain dead ones
> that doesn't have proper list headers (like the yahoo lists), and then I
> fall back to the old CTRL-SHIFT-R (Reply All) and then delete the one to
> the OP...
>

Indeed, both respondents to my post have taken care to only reply to 
list, however, here is an extract from the headers of an old post:

 > To: Peter Bell <peter at bellfamily.org.uk>
 > In-Reply-To: <4DCA7AC2.7010801 at bellfamily.org.uk>
 > References: <4DCA0409.4030702 at bellfamily.org.uk>
 > 	<2D2123E9-1CDC-4563-95B8-4575771DEC00 at iki.fi>
 > 	<4DCA7AC2.7010801 at bellfamily.org.uk>
 > Content-Type: text/plain; charset="ISO-8859-15"
 > Date: Wed, 11 May 2011 15:26:32 +0300
 > Message-ID: <1305116792.10421.191.camel at hurina>
 > Mime-Version: 1.0
 > X-Mailer: Evolution 2.32.2
 > Content-Transfer-Encoding: 7bit
 > Cc: Dovecot Mailing List <dovecot at dovecot.org>
 > Subject: Re: [Dovecot] Error messages in log
 > X-BeenThere: dovecot at dovecot.org
 > X-Mailman-Version: 2.1.14
 > Precedence: list
 > Reply-To: Dovecot Mailing List <dovecot at dovecot.org>
 > List-Id: Dovecot Mailing List <dovecot.dovecot.org>

I would have expected to see two copies of this post - preferably one in 
my normal inbox, the other redirected by pigeonhole, to my dovecot 
mailist folder.  However, I could only find a single copy (in my dovecot 
folder) so have to believe that something, somewhere, eliminated the 
duplicate.

My curiosity was aroused because I received a reply on another mailist, 
before I had configured a separate folder and sieve filter for it.  In 
that case, the message which survived was the one sent directly to my 
inbox - the copy to the mailist disappeared.  This makes me think the 
the duplicate removal must be happening somewhere in 
pigeonhole/dovecot/thunderbird since none of the stages before those 
would have any knowledge about the existence of the separate folder. 
However, I have have searched in the configurations, and failed to find 
any configuration setting which controls duplicate removal.

I'm not unhappy that I only see a single copy, but I would like to know 
what became of the other one - I feel uneasy when things disappear 
without explanation!

BTW, I used Thunderbird's 'reply list' button when posting this, so the 
only copy should be the one to the mailist.

-- 
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Peter Bell                                Mob: +63 (0) 9287 340 343
Tagum City, Philippines.                  Tel: +63 (0) 84 400 5085
email/msn: peter at bellfamily.org.uk        Tel: +44 (0) 118 331 0000