From: Terry Carmen (terrycnysupport.com)
Date: Sun Feb 03 2008 - 20:09:42 CST

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I'm working on a Postfix Policy server, and I'm a little confused about
the SMTPD_POLICY_README.html#protocol section.

According to my understanding, the example shows connecting to a policyd
server via a TCP socket, however there also seems to be a Perl script
involved

    1 /etc/postfix/master.cf:
    2 127.0.0.1:9998 inet n n n - 0
spawn
    3 user=nobody argv=/usr/bin/perl /usr/libexec/postfix/greylist.pl
    4
    5 /etc/postfix/main.cf:
    6 127.0.0.1:9998_time_limit = 3600

My understanding of other processes that connect to TCP sockets is that
it's a network operation that could connect to anywhere on the net, and
doesn't require any local files. According to the above sample, Postfix
should connect to a policy server listening on port 9998 on IP
127.0.0.1, send a number of name/value pairs, then listen for a
response. How is Perl and a local script involved in this transaction?

Thanks!

Terry

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