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The gwhitelist script assists mail administrators in placing the google outbound SMTP servers on a Postfix postscreen whitelist. The output format can be changed easily to suit other purposes. Written for /bin/sh Bourne Shell.
Tested under OpenBSD 5.3, FreeBSD 9.1, and Debian GNU/Linux 6.0.6.
Download gwhitelist 1.1 (2KB)
Update, July 30, 2016:
The recent availability of DNS-based IP whitelists has provided me with the whitelisting functionality and information that I need for my very low volume mail server, so I will not be updating gwhitelist in the future.
If you have the need to use gwhitelist-type functionality, I recommend you investigate Steve Jenkins' PostWhite, which has the functionality of gwhitelist, and more.
Thank you for your interest in gwhitelist.