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+<link rel="first" href="mailman-install.html" title='GNU mailman - installation Manual' />
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+<title>6.2.9 Receiver Verification</title>
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+<h3><a name="SECTION001629000000000000000">
+6.2.9 Receiver Verification</a>
+</h3>
+
+<p>
+Exim's receiver verification feature is very useful - it lets Exim reject
+unrouteable addresses at SMTP time. However, this is most useful for
+externally-originating mail that is addressed to mail in one of your local
+domains. For Mailman list traffic, mail originates on your server, and is
+addressed to random external domains that are not under your control.
+Furthermore, each message is addressed to many recipients
+- up to 500 if you use Mailman's default configuration and don't tweak
+<var>SMTP_MAX_RCPTS</var>.
+
+<p>
+Doing receiver verification on Mailman list traffic is a recipe for trouble.
+In particular, Exim will attempt to route every recipient addresses in
+outgoing Mailman list posts. Even though this requires nothing more than a
+few DNS lookups for each address, it can still introduce significant delays.
+Therefore, you should disable recipient verification for Mailman traffic.
+
+<p>
+Under Exim 3, put this in your main configuration section:
+
+<p>
+<div class="verbatim"><pre>
+ receiver_verify_hosts = !127.0.0.1
+</pre></div>
+
+<p>
+Under Exim 4, this is probably already taken care of for you by the default
+recipient verification ACL statement (in the <code>RCPT TO</code> ACL):
+
+<p>
+<div class="verbatim"><pre>
+ accept domains = +local_domains
+ endpass
+ message = unknown user
+ verify = recipient
+</pre></div>
+
+<p>
+which only does recipient verification on addresses in your domain. (That's
+not exactly the same as doing recipient verification only on messages coming
+from non-127.0.0.1 hosts, but it should do the trick for Mailman.)
+
+<p>
+
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+<hr />
+<span class="release-info">Release 2.1, documentation updated on December 5, 2007.</span>
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