General reference: http://www.stahl.bau.tu-bs.de/~hildeb/postfix/pop-before-smtp_en.shtml

1. Download the pop-before-smtp.pl RPM from here: http://popbsmtp.sourceforge.net/

   At the time of this writing, the current version was 1.30, and the downloaded file was pop-before-smtp-1.30-2.noarch.rpm.

2. Install the RPM.

3. Install essential Perl modules as follows:

   $ perl -MCPAN -e shell;

   cpan> install File::Tail

   cpan> install Net::Netmask

   cpan> install Date::Parse

4. Replace the default perl script pop-before-smtp-conf.pl:

   $ cp /etc/pop-before-smtp-conf.pl /etc/pop-before-smtp-conf.pl.default

   $ cp /usr/share/doc/pop-before-smtp-1.30/pop-before-smtp-conf.pl /etc

5. Edit /etc/pop-before-smtp-conf.pl:

   Set the log file: $file_tail{'name'} = '/var/log/messages';

   Choose the log-file pattern by uncommenting the lines provided for Cyrus.

6. Start the daemon:

   # nohup pop-before-smtp &

   (Remember to add an rc script to start this at the next system restart.)

7. Add to /etc/postfix/main.cf (or make appropriate modifications to your existing file):

   smtpd_recipient_restrictions =

   permit-mynetworks,

   check_client_access hash:/etc/postfix/pop-before-smtp,

   check_relay_domains

8. Reload postfix with the new configuration:

   # postfix reload

9. Test relaying from an outside network. After you read your mail, your IP address should be added to the pop-before-smtp database, /etc/postfix/pop-before-smtp.db. The command “strings /etc/postfix/pop-before-smtp.db” will show what, if any, addresses have been added.

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