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Date: Sun, 23 Jan 2011 10:11:33 -0700 (MST)
From: Warren Block <wblock@wonkity.com>
To: Da Rock <freebsd-questions@herveybayaustralia.com.au>
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Cc: freebsd-questions@freebsd.org
Subject: Duplicate mails (was Re: follow up...)
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On Sun, 23 Jan 2011, Da Rock wrote:

> On 01/23/11 07:43, Gary Kline wrote:
>> something else, probly not related to my web/dns troubles is that for days 
>> i seem to be getting "spammed" with multiple copies of some mail.  these dup
>> mail are ones that i _have_ sub'd to.  Just strange that this mail bug
>> happened at the same time that my bind troubles began.
>> 
> Is it related to the threads you have been posting? You'll get multiples of 
> those even if others are replying to replied posts.

% man procmailex | less +/duplicate

shows an effective way to filter out duplicates, if you use or can use 
mail/procmail.