Nyckelord<\/a> eller nyckelfraser
\n- Hashcash-systemet (Proof-of-Work)
\n- DIM och SPF
\n- URL-listor som produceras av sp\u00e5rare som uribl.com.<\/p>\nBayesianskt filter<\/h2>\n
Ut\u00f6ver de mer eller mindre statiska filtreringssystemen har SpamAssassin en Bayesiansk filtreringsalgoritm som kan \"l\u00e4ra sig\" vissa heuristiker, dvs. \u00e5terkommande, utm\u00e4rkande element, fr\u00e5n skr\u00e4ppost som redan har skickats och p\u00e5 s\u00e5 s\u00e4tt anpassa sig till anv\u00e4ndarens beteende. Systemet bygger p\u00e5 Byssians begrepp om sannolikhet, men har ofta kritiserats eftersom ett ol\u00e4rt filtreringssystem ofta ger falska positiva resultat.<\/p>\n
F\u00f6r att f\u00f6rhindra detta rekommenderas en mer detaljerad kontroll av de e-postmeddelanden som klassificeras som skr\u00e4ppost. Bayes-filtret inneh\u00e5ller ett verktyg, som kan anropas via kommandoraden sa-learn, med vars hj\u00e4lp antingen enskilda e-postmeddelanden eller hela brevl\u00e5dor kan skannas f\u00f6r heuristik. Om denna process har genomf\u00f6rts n\u00e5gra g\u00e5nger minskar antalet falska positiva resultat avsev\u00e4rt.<\/p>\n
Nuvarande utveckling<\/h2>\n
I samband med de senaste uppdateringarna till versionerna 3.3 och 3.4 har SpamAssassin f\u00e5tt en ny viktig funktion som f\u00f6rv\u00e4ntas p\u00e5verka resursanv\u00e4ndningen. \u00c4ven om det har gjorts vissa optimeringar av prestanda tidigare \u00e4r det nya att programmet nu beter sig som en deterministisk \u00e4ndlig automat. H\u00e5rdvaran kan i princip b\u00e4ttre anpassa sig till DEA eftersom de m\u00f6jliga tillst\u00e5nden alltid \u00e4r deterministiska, dvs. f\u00f6rutbest\u00e4mda. Ett l\u00e4mpligt programmerat system - t.ex. dagens serverh\u00e5rdvara - kan s\u00e5ledes reservera och frig\u00f6ra resurser p\u00e5 ett tidskritiskt s\u00e4tt.<\/p>\n
Programst\u00f6d<\/h2>\n
Som redan n\u00e4mnts \u00e4r den h\u00f6ga flexibiliteten i programkoden ett unikt f\u00f6rs\u00e4ljningsargument, men SpamAssassin har ocks\u00e5 ett framg\u00e5ngsrikt API som m\u00f6jligg\u00f6r datautbyte med m\u00e5nga andra program. N\u00e4r det g\u00e4ller projekt med \u00f6ppen k\u00e4llkod \u00e4r det bland annat de ofta anv\u00e4nda e-postklienterna Mozilla Thunderbird, KMail, Novell Evolution eller exotiska program som Citadel eller Claws Mail. I kommersiella produkter \u00e4r SpamAssassin redan integrerat i programkoden. Detta g\u00e4ller till exempel Icewarp-servern, McAfee SpamKiller, Mac OS X-servern eller Sophos PureMessage.<\/p>","protected":false},"excerpt":{"rendered":"
Pro Tag werden 28 Milliarden SPAM-Mails versendet. Das ist ein Gro\u00dfteil des gesamten E-Mail-Verkehrs und kaum ein E-Mail-Konto bleibt von den unerw\u00fcnschten Werbemails verschont. Die bisher einzige M\u00f6glichkeit, sein Postfach vor ihnen zu sch\u00fctzen, ist ein guter und funktionierender Spam-Filter. Auch SpamAssassin ist ein solcher Spam-Filter, jedoch macht ihn vor allem sein buchst\u00e4blich handverlesener Algorithmus 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