{"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\/hr\/blog\/administrirovanie\/zimbra-i-zashhita-ot-spama","title":{"rendered":"Zimbra i za\u0161tita od spam-a","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Jedan od klju\u010dnih zadataka koji stoji pred administratorom vlastitog po\u0161tanskog poslu\u017eitelja u tvrtki je filtracija e-mailova koji sadr\u017ee spam. \u0160teta koju spam uzrokuje o\u010dita je i jasna: osim prijetnje informati\u010dkoj sigurnosti poduze\u0107a, zauzima prostor na tvrdom disku poslu\u017eitelja, a tako\u0111er smanjuje u\u010dinkovitost zaposlenika kada se pojavi u \u201ePristigloj po\u0161ti\u201c. Odvojiti ne\u017eeljenu po\u0161tu od poslovne korespondencije nije tako jednostavan zadatak kao \u0161to se na prvi pogled \u010dini. Naime, rje\u0161enje koje jam\u010di stopostotni rezultat u filtriranju ne\u017eeljenih e-mailova jednostavno ne postoji, a nepravilno pode\u0161en algoritam za prepoznavanje ne\u017eeljene po\u0161te mo\u017ee nanijeti poduze\u0107u daleko ve\u0107u \u0161tetu nego sam spam.<\/p>\n

\"Zimbra
\n<\/a><\/noindex>
\nU Zimbra Collaboration Suite za\u0161tita od spama ostvaruje se uz pomo\u0107 slobodnog softverskog paketa Amavis, koji implementira SPF, DKIM i podr\u017eava crne, bijele i siva popisa. Osim Amavisa, u Zimbri se koriste antivirus ClamAV i spam filter SpamAssassin. Danas je SpamAssassin optimalno rje\u0161enje za filtriranje spama. Na\u010din njegovog rada je takav da se svaki dolazni e-mail provjerava prema regularnim izrazima karakteristi\u010dnim za ne\u017eeljene poruke. Nakon svake uspje\u0161ne provjere, SpamAssassin dodjeljuje e-mailu odre\u0111eni broj bodova. \u0160to vi\u0161e bodova skupi na kraju provjere, ve\u0107a je vjerojatnost da je analizirani e-mail spam.<\/p>\n

Ovakav sustav ocjenjivanja dolaznih e-mailova omogu\u0107uje prili\u010dno fleksibilno pode\u0161avanje filtera. Konkretno, mo\u017ee se postaviti broj bodova pri kojem \u0107e e-mail biti prepoznat kao sumnjiv i premje\u0161ten u mapu \u201eSpam\u201c, a mo\u017ee se postaviti i broj bodova pri kojem \u0107e se e-mail trajno brisati. Pode\u0161avanjem spam filtera na taj na\u010din, mogu\u0107e je rije\u0161iti odmah dva pitanja: prvo, izbje\u0107i punjenje dragocjenog diska beskorisnim spam po\u0161iljkama, i drugo, maksimalno smanjiti broj poslovnih e-mailova koji su proma\u0161eni zbog rada spam filtera.<\/p>\n

\"Zimbra
\n
\nGlavni problem s kojim se suo\u010davaju ruski korisnici Zimbre jest nespremnost ugra\u0111enog antispam sustava za filtriranje ruskojezi\u010dnog spama iz kutije. Uzrok le\u017ei u nedostatku ugra\u0111enih pravila za \u0107irilicu. Zapadni kolege taj problem rje\u0161avaju bezuvjetnim brisanjem svih poruka na ruskom jeziku. I doista, te\u0161ko da bi netko tko je pri zdravoj pameti poku\u0161ao voditi poslovnu korespondenciju s europskim tvrtkama na ruskom jeziku. Me\u0111utim, korisnici iz Rusije ne mogu tako postupiti. Djelomi\u010dno se taj problem mo\u017ee rije\u0161iti dodavanjem ruskih pravila za Spamassassin<\/a><\/noindex>, no njihova relevantnost i pouzdanost nisu zajam\u010deni.<\/p>\n

Zahvaljuju\u0107i velikoj ra\u0161irenosti i otvorenom izvoru, u Zimbra Collaboration Suite mogu\u0107e je integrirati i druga, uklju\u010duju\u0107i komercijalna, rje\u0161enja za osiguranje informati\u010dke sigurnosti. Me\u0111utim, najoptimalnija opcija mo\u017ee biti obla\u010dni sustav za\u0161tite od cyber prijetnji. Postavljanje obla\u010dne za\u0161tite obi\u010dno se provodi kako sa strane pru\u017eatelja usluga, tako i sa strane lokalnog poslu\u017eitelja. Bit postavljanja sastoji se u tome da se lokalna adresa za dolaznu po\u0161tu zamjenjuje adresom obla\u010dnog poslu\u017eitelja, gdje se vr\u0161i filtriranje poruka, a zatim se poruke koje su pro\u0161le sve provjere \u0161alju na adresu poduze\u0107a. <\/p>\n

Takav sustav se povezuje jednostavnom promjenom IP adrese<\/a> POP3 poslu\u017eitelja za dolaznu po\u0161tu u MX zapisu poslu\u017eitelja na IP adresu va\u0161eg obla\u010dnog rje\u0161enja. Drugim rije\u010dima, ako je ranije MX zapis lokalnog poslu\u017eitelja izgledao otprilike ovako:<\/p>\n

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

\nNakon promjene IP adrese na onu koju vam pru\u017ea pru\u017eatelj usluga obla\u010dne sigurnosti (pretpostavimo da \u0107e to biti 26.35.232.80), zapis \u0107e se promijeniti u sljede\u0107e:<\/p>\n

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

\nTako\u0111er, tijekom postavljanja u osobnom ra\u010dunu obla\u010dne platforme bit \u0107e potrebno navesti adresu domene s koje \u0107e dolaziti nefiltrirana e-po\u0161ta, kao i adresu domene na koju bi trebale biti poslane filtrirane poruke. Nakon ovih koraka filtriranje va\u0161e po\u0161te odvijat \u0107e se na poslu\u017eiteljima tre\u0107e strane, koja \u0107e biti odgovorna za sigurnost dolazne po\u0161te u poduze\u0107u.<\/p>\n

Stoga, Zimbra Collaboration Suite je odli\u010dan izbor za mala poduze\u0107a kojima je potrebna ekonomski povoljna, ali istodobno sigurna e-mail rje\u0161enja, kao i za velika poduze\u0107a koja kontinuirano rade na smanjenju rizika od kibernetskih prijetnji.<\/p>\n

Za sve upite vezane uz Zextras Suite mo\u017eete kontaktirati predstavnicu kompanije \u201eZextras\u201c Katarinu Triandafiliidi na e-mail adresu katerina@zextras.com
\n
Izvor: habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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