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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>
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7.2 How can I avoid getting duplicate messages? (duplicates option)
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Mailman can't completely stop you from getting duplicate messages, but it
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can help. One common reason people get multiple copies of a mail is that
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the sender has used a "group reply" function to send mail to both the list and
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some number of individuals. If you want to avoid getting these messages,
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Mailman can be set to check and see if you are in the <span class="mailheader">To:</span> or
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<span class="mailheader">CC:</span> lines of the message. If your address appears there,
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then Mailman can be told not to deliver another copy to you.
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To turn this on or off using the web interface:
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<li>Log in to your member options page. (See Section <a href="node9.html#sec:web">3.1</a>
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for more details on how to do this.)
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<li>Scroll down to the bottom of the page to the section marked
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"Avoid duplicate copies of messages?" and change the value accordingly.
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This can also be changed for multiple lists at the same time if you are subscribed to
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more than one list on the same domain. See Section <a href="node34.html#sec:global">10.1</a> for
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information about changing settings globally.
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To turn this on or off using the email interface:
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<li>Send a mail to <span class="email">LISTNAME-request@DOMAIN</span> with the command
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<var>set duplicates on</var> or <var>set duplicates off</var>.
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in either the body or the subject of the message. (See
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Section <a href="node10.html#sec:email">3.2</a> for more information about sending mail
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<li>Set it to "on" to receive list copies of messages already sent
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to you, set it to "off" to avoid receiving these duplicates.
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<span class="release-info">Release 2.1, documentation updated on January 11, 2009.</span>
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