#rev 2018-11-22 maegger
#rev 2020-09-04 maegger

= Spamprotection =
We use [[https://spamassassin.apache.org/|SpamAssassin]] to classify email and block spam (unsolicited bulk email). !SpamAssassin itself uses some tools like:
 * Pyzor - Pyzor is a collaborative, networked system to detect and block spam using digests of messages.
 * Razor - Vipul's Razor is a distributed, collaborative, spam detection and filtering network
 * Bayes Filtering - The Bayesian classifier in Spamassassin tries to identify spam by looking at what are called tokens; words or short character sequences that are commonly found in spam or ham.
 * Autowhitelisting - The Auto-!WhiteList tracks scores from messages previously received and adjusts the message score, either by boosting messages from senders who send ham or penalizing senders who have sent spam previously.

= How does it work? =
!SpamAssassin looks at every incoming e-mail and assigns "SPAM-points" according to many different [[https://cwiki.apache.org/confluence/display/SPAMASSASSIN/CustomRulesets|rules]] about what SPAM mails contain. For example a mail gets some points if it contains a line written all UPERCASE, if there is a unsubscribe URL or if it speaks about mortgage rates. If the sum of the points surpasses a certain amount, then it is marked as "SPAM" and is rejected

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[[CategoryMAIL]]