What is SpamAssassin?

SpamAssassin is a prominent spam filter that scores emails using different spam detection techniques like authentication checks, content screening, DNS-based spam detection, and more. The assessment comes in the form of multiple tests, all of which collectively return an aggregate score. A message is graded as being spam or not based on this aggregate score. In most cases, an email with a SpamAssassin score of 5 or more is considered spam.

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