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+<link rel="first" href="mailman-install.html" title='GNU Mailman - Installation Manual' />
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+<title>6.3.3 Performance notes</title>
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+<H3><A NAME="SECTION001633000000000000000">
+6.3.3 Performance notes</A>
+</H3>
+
+<P>
+One of the surest performance killers for Sendmail users is when Sendmail is
+configured to synchronously verify the recipient's host via DNS. If it does
+this for messages posted to it from Mailman, you will get horrible
+performance. Since Mailman usually connects via <code>localhost</code>
+(i.e. 127.0.0.1) to the SMTP port of Sendmail, you should be sure to configure
+Sendmail to <strong>not</strong> do DNS verification synchronously for localhost
+connections.
+
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+<div class='online-navigation'>
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+<hr />
+<span class="release-info">Release 2.1, documentation updated on December 13, 2004.</span>
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