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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 5, 2007.</span>
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