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Current File : /usr/share/doc/postgrey-1.37/README.exim
Using Postgrey with Exim
------------------------
Whilst Postgrey is designed to work with the Postfix MTA it is possible to
get it to work with Exim.  This isn't the only way to get greylisting to
work under Exim[1], and it might not even be the easiest.  Postgrey does,
however, have some advantages over the alternatives that may be useful
depending on your situation.

In order to get Postgrey and Exim to cooperate we need to get Exim to
implement enough of Postfix's access policy delegation protocol[2] to be
able to talk to the Postgrey daemon, which we can do in an acl_smtp_rcpt ACL
in Exim's config file:

 defer log_message = greylisted host $sender_host_address
       set acl_m0  = request=smtpd_access_policy\nprotocol_state=RCPT\nprotocol_name=${uc:$received_protocol}\nhelo_name=$sender_helo_name\nclient_address=$sender_host_address\nclient_name=$sender_host_name\nsender=$sender_address\nrecipient=$local_part@$domain\n\n
       set acl_m0  = ${sg{${readsocket{/var/run/postgrey}{$acl_m0}{5s}{}{action=DUNNO}}}{action=}{}}
       message     = ${sg{$acl_m0}{^\\w+\\s*}{}}
       condition   = ${if eq{${uc:${substr{0}{5}{$acl_m0}}}}{DEFER}{true}{false}}

Whilst this ACL looks complicated, all it really does tells Exim to defer
incoming e-mail if it is greylisted and has no effect once the greylisting
period is over.  It fails safe in the sense that it'll pass all e-mail
without deferring it if it can't talk to Postgrey (the hard-coded
"action=DUNNO").  It's also worth noting that it isn't a full implementation
of Postfix's policy protocol -- it is just enough to get the greylisting job
done in a reasonably sane way.

You'll obviously need to adjust the above ACL to match your setup.  In
particular you might need to change the socket path from /var/run/postgrey. 
You should also check that you're not already using $acl_m0 for something
else (you can change all occurrences of $acl_m0 to any unused variable
between $acl_m1 and $acl_m9 if you are).

Postfix's protocol allows for a policy server to prepend a header on
delivered e-mail, and Postgrey uses this to notify users of how long mail
was delayed for. If you want to make use of this feature, you need the
following ACL somewhere under your defer one:

  warn message     = ${sg{$acl_m0}{^\\w+\\s*}{}}
       condition   = ${if eq{${uc:${substr{0}{7}{$acl_m0}}}}{PREPEND}{true}{false}}

Once you've changed your Exim config, you'll also need to set up and
configure Postgrey.  You do this as you would for Postfix, except that you
need to add the --exim option to the postgrey command line.  This alters the
behavior of Postgrey slightly and makes it close the connection as Exim's
readsocket expansion expects.

You can test your new configuration using Exim's -bh command line option to
emulate SMTP sessions from a variety of different places.

-- 
- Guy Antony Halse <guy@rucus.ru.ac.za>

[1] http://www.greylisting.org/implementations/exim.shtml
[2] http://www.postfix.org/SMTPD_POLICY_README.html

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