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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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+<span class="release-info">Release 2.1, documentation updated on December 13, 2004.</span>
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