Schryen, Guido2018-01-162018-01-1620042004https://dl.gi.de/handle/20.500.12116/12413Spam as unsolicited email has certainly crossed the border of just being bothersome. In 2003, it surpassed legitimate email — growing to more than 50% of all Internet emails. Annually, it causes economic harms of several billion Euros. Fighting spam, beside legal approaches especially technical means are deployed in practical systems, mainly focussing on blocking and filtering mechanisms.This article introduces into the spam field and describes, assesses, and classifies the currently most important approaches against spam.BlockingEmailFilteringLightweight Mail Transfer Agent Authentication Protocol (LMAP)SpamSpoofingText/Journal Article1861-8936