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+<link rel="first" href="mailman-member.html" title='GNU mailman - list Member Manual' />
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+<title>7.2 How can I avoid getting duplicate messages? (duplicates option)
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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>
+
+<p>
+
+<div class="navigation">
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+<hr />
+<span class="release-info">Release 2.1, documentation updated on December 5, 2007.</span>
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