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<H3><A NAME="SECTION001629000000000000000">
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6.2.9 Receiver Verification</A>
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Exim's receiver verification feature is very useful - it lets Exim reject
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unrouteable addresses at SMTP time. However, this is most useful for
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externally-originating mail that is addressed to mail in one of your local
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domains. For Mailman list traffic, mail originates on your server, and is
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addressed to random external domains that are not under your control.
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Furthermore, each message is addressed to many recipients
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- up to 500 if you use Mailman's default configuration and don't tweak
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<var>SMTP_MAX_RCPTS</var>.
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Doing receiver verification on Mailman list traffic is a recipe for trouble.
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In particular, Exim will attempt to route every recipient addresses in
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outgoing Mailman list posts. Even though this requires nothing more than a
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few DNS lookups for each address, it can still introduce significant delays.
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Therefore, you should disable recipient verification for Mailman traffic.
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Under Exim 3, put this in your main configuration section:
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<div class="verbatim"><pre>
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receiver_verify_hosts = !127.0.0.1
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Under Exim 4, this is probably already taken care of for you by the default
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recipient verification ACL statement (in the <code>RCPT TO</code> ACL):
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<div class="verbatim"><pre>
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accept domains = +local_domains
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message = unknown user
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which only does recipient verification on addresses in your domain. (That's
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not exactly the same as doing recipient verification only on messages coming
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from non-127.0.0.1 hosts, but it should do the trick for Mailman.)
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<span class="release-info">Release 2.1, documentation updated on December 13, 2005.</span>
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