Debian/Ubuntu Tips and Tricks

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Debian/Ubuntu Tips and Tricks

Postfix and Postgrey: A proactive approach to spam filtering

Posted by chantra on 23rd November 2006

This entry is part 1 of 2 in the series Postfix and Postgrey: A proactive approach to spam filtering

Greylisting is yet another way for preventing your mailbox getting full of spam. A famous spam fighter software is spamassassin which filter emails. Greylisting won't replace such softwares but it will behave as a powerful proactive barrier which will reduce the amount of spam getting through your mail server.

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Postfix and Postgrey: A proactive approach to spam filtering — page 2

Posted by chantra on 23rd November 2006

This entry is part 2 of 2 in the series Postfix and Postgrey: A proactive approach to spam filtering

4. Tweaking up Postgrey

4.1. Postgrey Configuration files

There is two main configuration files in /etc/postgrey: whitelist_clients and whitelist_recipients.

In whitelist_clients, you can define a list of mail server that you do not want to greylist. Either because there are hosts that you trust, or because there are host that it is an issue to greylist.
Client addresses can be specified as follow:

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