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-<H3><A NAME="SECTION0016210000000000000000">
-6.2.10 SMTP Callback</A>
-</H3>
-
-<P>
-Exim's SMTP callback feature is an even more powerful way to detect bogus
-sender addresses than normal sender verification. Unfortunately, lots of
-servers send bounce messages with a bogus address in the header, and there are
-plenty that send bounces with bogus envelope senders (even though they're
-supposed to just use an empty envelope sender for bounces).
-
-<P>
-In order to ensure that Mailman can disable/remove bouncing addresses, you
-generally want to receive bounces for Mailman lists, even if those bounces are
-themselves not bounceable. Thus, you might want to disable SMTP callback on
-bounce messages.
-
-<P>
-With Exim 4, you can accomplish this using something like the following in
-your <code>RCPT TO</code> ACL:
-
-<P>
-<div class="verbatim"><pre>
- # Accept bounces to lists even if callbacks or other checks would fail
- warn message = X-WhitelistedRCPT-nohdrfromcallback: Yes
- condition = \
- ${if and {{match{$local_part}{(.*)-bounces\+.*}} \
- {exists {MAILMAN_HOME/lists/$1/config.pck}}} \
- {yes}{no}}
- {yes}{no}}
-
- accept condition = \
- ${if and {{match{$local_part}{(.*)-bounces\+.*}} \
- {exists {MAILMAN_HOME/lists/$1/config.pck}}} \
- {yes}{no}}
- {yes}{no}}
-
- # Now, check sender address with SMTP callback.
- deny !verify = sender/callout=90s
-</pre></div>
-
-<P>
-If you also do SMTP callbacks on header addresses, you'll want something like
-this in your <code>DATA</code> ACL:
-
-<P>
-<div class="verbatim"><pre>
- deny !condition = $header_X-WhitelistedRCPT-nohdrfromcallback:
- !verify = header_sender/callout=90s
-</pre></div>
-
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-<span class="release-info">Release 2.1, documentation updated on December 13, 2005.</span>
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