Category Archives: SPAM

SpamAssassin

The four “score sets” are computed to account for configurations in which certain rules are never used. For example, score sets 0 and 1 assume that Bayes has been disabled, while sets 2 and 3 are used when Bayes is enabled. Sets 0 and 2 are used when network tests have been disabled, whereas sets 1 and 3 are used… (more…)

Postfix

Building a high-performance mail delivery system is one thing; building one that does not knock over other systems is a different story. Some mailers suffer from the thundering herd syndrome: they literally flood other systems with mail. Postfix tries to be a fast mailer and a good neighbor at the same time. On the inbound side, the Postfix SMTP server… (more…)

Spam

Most people talk of the percentage that spam makes up of all email sent, which is a useful rough measure of the global impact of spam. The actual percentage in any inbox will of course vary hugely, depending on the average rate at which people receive other email. A better measure to gauge the impact on your own inbox might… (more…)

Killing

There are numerous ways to prevent spam from reaching your inbox, the most popular is probably SpamAssassin. Greylisting will not replace spam filtering software like SA but it will serve as a powerful first hurdle for spam thus reducing the ammount of spam entering the system at all. It should rather be seen as an addition to all the other… (more…)

How

The HowtoForge guide is great for everything however if you have a very busy mail server running Spam Assasin on 1000s of message per minute is a CPU killer. The best answer is to stop the mail before it hits Spam Assasin with a range of RBL (Realtime Blacklists) and RHBL (Same but different), Greylistings and Helo Checks. http://www.howtoforge.com/virtual_postfix_antispam