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<h2><a name="SECTION002720000000000000000"></a><a name="sec:nodupes"></a>
<br>
7.2 How can I avoid getting duplicate messages? (duplicates option)

</h2>

<p>
Mailman can't completely stop you from getting duplicate messages, but it 
can help.  One common reason people get multiple copies of a mail is that 
the sender has used a "group reply" function to send mail to both the list and 
some number of individuals.  If you want to avoid getting these messages,
Mailman can be set to check and see if you are in the <span class="mailheader">To:</span> or
<span class="mailheader">CC:</span> lines of the message.  If your address appears there,
then Mailman can be told not to deliver another copy to you.

<p>
To turn this on or off using the web interface:

<ol>
<li>Log in to your member options page.  (See Section&nbsp;<a href="node9.html#sec:web">3.1</a> 
	for more details on how to do this.)
</li>
<li>Scroll down to the bottom of the page to the section marked
	"Avoid duplicate copies of messages?" and change the value accordingly.
</li>
</ol>

<p>
This can also be changed for multiple lists at the same time if you are subscribed to 
more than one list on the same domain.  See Section&nbsp;<a href="node34.html#sec:global">10.1</a> for 
information about changing settings globally.

<p>
To turn this on or off using the email interface:

<ol>
<li>Send a mail to <span class="email">LISTNAME-request@DOMAIN</span> with the command
   <var>set&nbsp;duplicates&nbsp;on</var> or <var>set&nbsp;duplicates&nbsp;off</var>.

<p>
Commands can appear
   in either the body or the subject of the message.  (See
   Section&nbsp;<a href="node10.html#sec:email">3.2</a> for more information about sending mail
   commands.)
</li>
<li>Set it to "on" to receive list copies of messages already sent
	to you, set it to "off" to avoid receiving these duplicates.
</li>
</ol>

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<span class="release-info">Release 2.1, documentation updated on September 9, 2010.</span>
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