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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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+<span class="release-info">Release 2.1, documentation updated on December 5, 2007.</span>
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