• Perl >= 5.6.0
• Net::Server (Perl Module)
• IO::Multiplex (Perl Module)
• BerkeleyDB (Perl Module)
• Berkeley DB >= 4.1 (Library)
• Digest::SHA (Perl Module, only for --privacy option)
• NetAddr::IP

See POD documentation in postgrey. Execute:

perldoc postgrey

See also Postgrey's homepage:

http://postgrey.schweikert.ch/

There is a mailing-list for the discussion of postgrey, where you can also ask for help in case of trouble. To subscribe, send a mail with subject 'subscribe' to:

[email protected] 

There is also a mailing-list archive, where you might find answers:

http://lists.ee.ethz.ch/wws/arc/postgrey