SpamAssassin

Developed by Apache Software Foundation, SpamAssassin is a Pearl-based email spam-filtering computer program, which can be used as an independent spam filtering application or a subordinate program to other spam filtering programs.

Ways to Work with SpamAssassin

• Integrate the program into a mail server so it will fulfill the automatic filtering of mail sent to the website.
• Integrate with several email clients to be run by individual users.

Spam-filtering Methods of SpamAssassin

• DNS-based blackhole lists and DNS-based whitelists
• Fuzzy-checksum-based spam detection filters
• Hashcash email stamps based on proof-of-work
• Sender Policy Framework and Domain Keys Identified Mail
• URI blacklists which are tracking spam websites

SpamAssassin applies a variety of rules that are used to detect whether mail is spam or not. In the program's documentation, these rules are called "tests." Each test has a particular value, which will be assigned to a message if it matches the criteria. The value can be negative or positive. A positive value means that the message is "spam" and a negative value stands for non-spam.

By combining all the test scores, the program compiles a general score. SpamAssassin sets the score threshold, which defines whether the message is spam or not. Usually, a message has to match multiple tests to be classified as spam. One only test match will not mark it as spam.

SpamAssassin is free software, also called open source.

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