{"id":53013,"date":"2019-11-21T00:00:00","date_gmt":"2019-11-20T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/zimbra-i-zashhita-ot-spama"},"modified":"2020-02-18T14:00:51","modified_gmt":"2020-02-18T11:00:51","slug":"zimbra-i-zashhita-ot-spama","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/administrirovanie\/zimbra-i-zashhita-ot-spama","title":{"rendered":"Zimbra og spambeskyttelse","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

En af de vigtigste opgaver, som en administrator for en egen e-mailserver i virksomheden st\u00e5r overfor, er filtrering af e-mails, der indeholder spam. Skaden fra spam er \u00e5benlys og forst\u00e5elig: udover truslen mod virksomhedens informationssikkerhed optager den plads p\u00e5 serverens harddisk og reducerer medarbejdernes effektivitet, n\u00e5r den havner i 'Indbakken'. At adskille u\u00f8nsket reklame fra erhvervskorrespondance er ikke s\u00e5 enkel en opgave, som det ser ud ved f\u00f8rste \u00f8jekast. Problemet er, at der ikke findes nogen l\u00f8sning, der garanterer 100% resultater i filtrering af u\u00f8nskede e-mails, og en forkert konfigureret algoritme til identifikation af u\u00f8nsket reklame kan for\u00e5rsage meget mere skade for virksomheden end selve spam'en.<\/p>\n

\"Zimbra
\n<\/a><\/noindex>
\nI Zimbra Collaboration Suite er beskyttelse mod spam implementeret ved hj\u00e6lp af det frit tilg\u00e6ngelige softwarepakke Amavis, som implementerer SPF, DKIM og underst\u00f8tter sorte, hvide samt gr\u00e5 lister. Udover Amavis bruger Zimbra antivirusprogrammet ClamAV og spamfilteret SpamAssassin. I dag er SpamAssassin den optimale l\u00f8sning til filtrering af spam. Dets arbejdsprincip er, at hver indkommende e-mail kontrolleres for at overholde de regul\u00e6re udtryk, der er karakteristiske for u\u00f8nskede reklamer. Efter hver registreret kontrol tildeler SpamAssassin e-mailen et bestemt antal point. Jo flere point der opn\u00e5s ved slutningen af kontrollen, desto h\u00f8jere er sandsynligheden for, at den analyserede e-mail er spam.<\/p>\n

Et s\u00e5dant vurderingssystem for indkommende e-mails giver mulighed for en ret fleksibel ops\u00e6tning af filteret. Is\u00e6r kan man indstille det antal point, hvor en e-mail vil blive betragtet som mist\u00e6nkelig og sendt til 'Spam'-mappen, og man kan ogs\u00e5 indstille det antal point, hvor en e-mail vil blive permanent slettet. Ved at konfigurere spamfilteret p\u00e5 denne m\u00e5de kan man l\u00f8se to problemer med det samme: for det f\u00f8rste undg\u00e5 at fylde v\u00e6rdifuld diskplads med un\u00f8dvendige spam-reklamer, og for det andet maksimalt reducere antallet af forretnings-e-mails, der g\u00e5r tabt p\u00e5 grund af spamfilterets arbejde.<\/p>\n

\"Zimbra
\n
\nHovedproblemet, som russiske brugere af Zimbra kan st\u00e5 over for, er manglen p\u00e5 den indbyggede antispam-system til at filtrere russisk spam fra starten. \u00c5rsagen til dette ligger i frav\u00e6ret af indbyggede regler for kyrillisk tekst. Vesteurop\u00e6iske kolleger l\u00f8ser dette problem ved ubetinget at slette alle e-mails p\u00e5 russisk. Og faktisk, hvem ville v\u00e6re ved sine sansers fulde salvie og fors\u00f8ge at f\u00f8re forretningskorrespondance med europ\u00e6iske virksomheder p\u00e5 russisk? Men brugere fra Rusland kan ikke g\u00f8re det. Delvist kan dette problem l\u00f8ses ved at tilf\u00f8je russiske regler for Spamassassin<\/a><\/noindex>, dog er deres aktualitet og p\u00e5lidelighed ikke garanteret.<\/p>\n

Takket v\u00e6re den store udbredelse og \u00e5bne kildekode kan der i Zimbra Collaboration Suite integreres andre, herunder kommercielle l\u00f8sninger til informationssikkerhed. Dog kan den mest optimale l\u00f8sning v\u00e6re et skybaseret system til beskyttelse mod cybertrusler. Ops\u00e6tningen af den skybaserede beskyttelse udf\u00f8res normalt b\u00e5de fra serviceudbyderens side og fra den lokale server. Essensen af ops\u00e6tningen ligger i, at den lokale adresse for indg\u00e5ende e-mail erstattes med adressen til den skybaserede server, hvor filtreringen af e-mails finder sted, hvorefter de e-mails, der har best\u00e5et alle kontroller, sendes til virksomhedens adresse. <\/p>\n

S\u00e5dan et system tilkobles ved hj\u00e6lp af en simpel udskiftning IP-adresser<\/a> af POP3-serveren for indg\u00e5ende e-mail i MX-posterne p\u00e5 serveren med ip-adressen til din skybaserede l\u00f8sning. Med andre ord, hvis MX-posten for den lokale server tidligere s\u00e5 ud som f\u00f8lger:<\/p>\n

domain.com. IN MX 0 pop
\ndomain.com. IN MX 10 pop
\npop IN A 192.168.1.100<\/p><\/blockquote>\n

\nS\u00e5 efter \u00e6ndringen af ip-adressen til den, som din skytjenesteudbyder giver dig (lad os sige, det vil v\u00e6re 26.35.232.80), vil posten \u00e6ndre sig til f\u00f8lgende:<\/p>\n

domain.com. IN MX 0 pop
\ndomain.com. IN MX 10 pop
\npop IN A 26.35.232.80<\/p><\/blockquote>\n

\nUnder ops\u00e6tningen i den personlige konto p\u00e5 den skybaserede platform vil det ogs\u00e5 v\u00e6re n\u00f8dvendigt at angive dom\u00e6neadressen, fra hvilken den ufilerede e-mail vil komme, samt dom\u00e6neadressen, hvor de filtrerede e-mails skal sendes. Efter disse handlinger vil filtreringen af din e-mail finde sted p\u00e5 serverne hos en tredjepartsorganisation, som vil v\u00e6re ansvarlig for sikkerheden af den indg\u00e5ende e-mail p\u00e5 virksomheden.<\/p>\n

Derfor er Zimbra Collaboration Suite ideel til b\u00e5de sm\u00e5 virksomheder, der har brug for en s\u00e5 billig som mulig, men samtidig sikker l\u00f8sning til e-mail, og store virksomheder, der konstant arbejder p\u00e5 at reducere risiciene forbundet med cybertrusler.<\/p>\n

For alle sp\u00f8rgsm\u00e5l vedr\u00f8rende Zextras Suite kan du kontakte repr\u00e6sentanten for selskabet \u00abZextras\u00bb, Katerina Triandafili, p\u00e5 e-mail katerina@zextras.com
\n
Kilde: habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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