{"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\/pt\/blog\/administrirovanie\/zimbra-i-zashhita-ot-spama","title":{"rendered":"Zimbra e prote\u00e7\u00e3o contra spam","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Uma das principais tarefas que um administrador de um servidor de e-mail corporativo enfrenta \u00e9 filtrar mensagens que cont\u00eam spam. O dano causado pelo spam \u00e9 claro e compreens\u00edvel: al\u00e9m da amea\u00e7a \u00e0 seguran\u00e7a da informa\u00e7\u00e3o da empresa, ele ocupa espa\u00e7o no disco r\u00edgido do servidor e diminui a efici\u00eancia dos funcion\u00e1rios ao chegar na pasta de \"Mensagens Recebidas\". Separar as mensagens indesejadas da correspond\u00eancia comercial n\u00e3o \u00e9 uma tarefa t\u00e3o simples quanto parece \u00e0 primeira vista. O fato \u00e9 que n\u00e3o existe uma solu\u00e7\u00e3o que garanta um resultado de 100% na filtragem de e-mails indesejados, e um algoritmo de detec\u00e7\u00e3o de mensagens indesejadas mal configurado pode causar muito mais danos \u00e0 empresa do que o pr\u00f3prio spam.<\/p>\n

\"Zimbra
\n<\/a><\/noindex>
\nNo Zimbra Collaboration Suite, a prote\u00e7\u00e3o contra spam \u00e9 implementada por meio da solu\u00e7\u00e3o de software livre Amavis, que realiza SPF, DKIM e suporta listas negras, brancas e cinzas. Al\u00e9m do Amavis, o Zimbra utiliza o antiv\u00edrus ClamAV e o filtro de spam SpamAssassin. Atualmente, o SpamAssassin \u00e9 a solu\u00e7\u00e3o ideal para a filtragem de spam. Seu funcionamento consiste em que cada mensagem recebida \u00e9 verificada em rela\u00e7\u00e3o a express\u00f5es regulares caracter\u00edsticas de mensagens indesejadas. Ap\u00f3s cada verifica\u00e7\u00e3o que \u00e9 acionada, o SpamAssassin atribui uma certa quantidade de pontos \u00e0 mensagem. Quanto mais pontos um e-mail acumular ao final da verifica\u00e7\u00e3o, maior a probabilidade de que a mensagem analisada seja spam.<\/p>\n

Esse sistema de avalia\u00e7\u00e3o de mensagens recebidas permite configurar o filtro de forma bastante flex\u00edvel. Em particular, \u00e9 poss\u00edvel estabelecer o n\u00famero de pontos em que uma mensagem ser\u00e1 considerada suspeita e enviada para a pasta \"Spam\", ou pode-se definir o n\u00famero de pontos em que a mensagem ser\u00e1 exclu\u00edda permanentemente. Configurando o filtro de spam dessa maneira, \u00e9 poss\u00edvel resolver duas quest\u00f5es de uma s\u00f3 vez: primeiro, evitar que espa\u00e7o valioso no disco seja ocupado por mensagens in\u00fateis de spam e, segundo, minimizar o n\u00famero de mensagens comerciais que s\u00e3o perdidas devido ao funcionamento do filtro de spam.<\/p>\n

\"Zimbra
\n
\nO principal problema que pode surgir para os usu\u00e1rios russos do Zimbra \u00e9 a falta de preparo do sistema anti-spam embutido para filtrar spam em l\u00edngua russa imediatamente. A raz\u00e3o para isso reside na aus\u00eancia de regras integradas para texto em cir\u00edlico. Colegas ocidentais resolvem essa quest\u00e3o excluindo incondicionalmente todos os e-mails em russo. E, de fato, \u00e9 pouco prov\u00e1vel que algu\u00e9m em s\u00e3 consci\u00eancia e ju\u00edzo tente corresponder com empresas europeias em russo. No entanto, usu\u00e1rios da R\u00fassia n\u00e3o podem agir assim. Uma solu\u00e7\u00e3o parcial para esse problema pode ser a adi\u00e7\u00e3o de regras russas para o Spamassassin<\/a><\/noindex>, no entanto, sua relev\u00e2ncia e confiabilidade n\u00e3o s\u00e3o garantidas.<\/p>\n

Devido \u00e0 ampla distribui\u00e7\u00e3o e c\u00f3digo-fonte aberto, no Zimbra Collaboration Suite \u00e9 poss\u00edvel incorporar outras, incluindo solu\u00e7\u00f5es comerciais, para garantir a seguran\u00e7a da informa\u00e7\u00e3o. No entanto, a op\u00e7\u00e3o mais otimizada pode ser um sistema de prote\u00e7\u00e3o baseado em nuvem contra amea\u00e7as cibern\u00e9ticas. A configura\u00e7\u00e3o da prote\u00e7\u00e3o em nuvem geralmente \u00e9 realizada tanto pelo fornecedor do servi\u00e7o quanto pelo servidor local. A ess\u00eancia da configura\u00e7\u00e3o \u00e9 que o endere\u00e7o local para e-mails recebidos \u00e9 trocado pelo endere\u00e7o do servidor em nuvem, onde a filtragem de e-mails ocorre, e depois os e-mails que passaram por todas as verifica\u00e7\u00f5es s\u00e3o enviados para o endere\u00e7o da empresa. <\/p>\n

Esse sistema \u00e9 conectado por meio de uma simples substitui\u00e7\u00e3o endere\u00e7o IP<\/a> do servidor POP3 para e-mails recebidos nas entradas MX do servidor para o IP do seu solu\u00e7\u00e3o em nuvem. Em outras palavras, se antes a entrada MX do servidor local parecia algo assim:<\/p>\n

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

\nAp\u00f3s a substitui\u00e7\u00e3o do IP para aquele fornecido pelo seu provedor de servi\u00e7os de seguran\u00e7a em nuvem (vamos supor que seja 26.35.232.80), a entrada mudar\u00e1 para o seguinte:<\/p>\n

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

\nAl\u00e9m disso, durante a configura\u00e7\u00e3o no painel da plataforma em nuvem, ser\u00e1 necess\u00e1rio indicar o endere\u00e7o do dom\u00ednio de onde os e-mails n\u00e3o filtrados chegar\u00e3o, e o endere\u00e7o do dom\u00ednio para onde os e-mails filtrados devem ser enviados. Ap\u00f3s essas a\u00e7\u00f5es, a filtragem do seu e-mail ocorrer\u00e1 nos servidores de uma organiza\u00e7\u00e3o terceirizada, que ser\u00e1 respons\u00e1vel pela seguran\u00e7a da correspond\u00eancia recebida na empresa.<\/p>\n

Dessa forma, o Zimbra Collaboration Suite \u00e9 ideal tanto para pequenas empresas que precisam de uma solu\u00e7\u00e3o de e-mail acess\u00edvel e segura, quanto para grandes corpora\u00e7\u00f5es que trabalham constantemente na redu\u00e7\u00e3o de riscos relacionados a amea\u00e7as cibern\u00e9ticas.<\/p>\n

Para qualquer quest\u00e3o relacionada ao Zextras Suite, voc\u00ea pode entrar em contato com a representante da empresa Zextras, Katerina Triandafili, pelo e-mail katerina@zextras.com.
\n
Fonte: habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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