The SpamAssassin system is software for analyzing email messages, determining how likely they are to be spam, and reporting its conclusions. It is a rule-based system that compares different parts of email messages with a large set of rules. Each rule adds or removes points from a message's spam score. A message with a high enough score is reported to be spam. Many spam-checking systems are available. SpamAssassin has become popular for several reasons:.
It uses a large number of different kinds of rules and weights them according to their checks. Rules that have been demonstrated to be more effective at discriminating spam from non-spam email are given higher weightings. It is easy to tune the scores associated with each rule or to add new rules based on regular expressions. SpamAssassin can adapt to each system's email environment, learning to recognize which senders are to be trusted and to identify new kinds of spam.
It can report spam to several different spam clearinghouses and can be configured to create spam traps—email addresses that are used only to forward spam to a clearinghouse. The approach, to filter spam in SpamAssassin is more sophisticated than the simple keyword matching provided by most SMTP anti-virus software.
SpamAssassin uses a scoring system : messages are tagged as spam only when they have enough spam characteristics in total. This in combination with other features results in very few false positives. SpamAssassin doesn't block spam. Instead, it tags messages as probable spam by changing the Subject line and message headers. All automated spam filters will produce some false positives wanted e-mail mistakenly tagged as spam and false negatives spam not identified as such.
SpamAssassin identifies probable spam e-mail, but leaves the choice of what to do with it up to you. You can instruct the users how to add rules to their e-mail software to delete identified messages or, better yet, move them to a folder for later review.
The method shown here only tags suspected spam. No automated deletion is performed, but the filter script can be changed without too much effort to sideline or delete suspected spam if that's what you want.
SpamAssassin is build from several Perl modules. We recommend to installing it manually as described below. The SpamAssassin documentation describes how to install and configure the software.
We installed each module with make, make test and make install. We recommend making some changes to local. You should whitelist the e-mail addresses of well-known legitimate senders to avoid the chance of them being mis-identified by the SpamAssassin default rules. How many hits before a message is considered spam.
Specially all RBL lookups should be deactived in the Postfix configuration file main. The purpose of this program is to provide a daemonized version of the SpamAssassin executable. Looking for tips to improve your existing installation? Click here for a variety of topics in our Wiki that might help. Sent here because you received an e-mail message which was modified by SpamAssassin?
Please read this end-user notice. Apache SpamAssassin 3. All future releases and bug fixes will be in the 4. If you do not update to 3. There are a number of functional patches, improvements as well as security reasons to upgrade to 3. Wide-spectrum : SpamAssassin uses a wide variety of local and network tests to identify spam signatures. This makes it harder for spammers to identify one aspect which they can craft their messages to work around. You to can become part of the team. Here's how:.
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