{"id":41637,"date":"2012-09-27T11:53:53","date_gmt":"2012-09-27T11:53:53","guid":{"rendered":"https:\/\/wp.lvh.me\/blog\/2012\/09\/27\/o-que-e-e-como-funciona-o-sistema-dkim\/"},"modified":"2022-05-13T16:38:04","modified_gmt":"2022-05-13T16:38:04","slug":"o-que-e-e-como-funciona-o-sistema-dkim","status":"publish","type":"post","link":"https:\/\/wpstaging.mailrelay.com\/pt\/blog\/2012\/09\/27\/o-que-e-e-como-funciona-o-sistema-dkim\/","title":{"rendered":"O que \u00e9, e como funciona o sistema DKIM"},"content":{"rendered":"<p>O sistema DKIM (DomainKeys Identified Mail) \u00e9 uma evolu\u00e7\u00e3o do sistema DomainKeys inicialmente desenvolvido por Yahoo como um mecanismo para que um e-mail possa ser validado por um destinat\u00e1rio, comprovando de forma inequ\u00edvoca que a sua origem \u00e9 realmente a que aparece nos cabe\u00e7alhos do e-mail.<\/p>\n<p>Na verdade n\u00e3o \u00e9 um sistema projetado especificamente para combater o spam, \u00e9 uma tecnologia de autentica\u00e7\u00e3o, mas se utiliza para atingir esse objetivo, dado que o que identifica que os e-mails s\u00e3o leg\u00edtimos. &#8220;Como o pr\u00f3prio usu\u00e1rio pode enviar spam do seu dom\u00ednio e servidores. De fato, se todos os usassem, basicamente os servidores de e-mail poderiam descartar qualquer mensagem que n\u00e3o viesse identificada pelo sistema DKIM como aut\u00eantico, ou pelo menos dos dom\u00ednios que os spammers usam ilegalmente como remetente, para aparentar uma maior credibilidade. Poderiam continuar mandando a partir de dom\u00ednios pr\u00f3prios, por\u00e9m\u00a0rapidamente\u00a0 entrariam em listas de spam. Por esta raz\u00e3o, tamb\u00e9m \u00e9 um sistema muito \u00fatil para combater o phishing.<\/p>\n<p><strong>Como isso funciona?<\/strong><\/p>\n<p>DKIM inclui um cabe\u00e7alho na mensagem com uma assinatura digital do conte\u00fado da mensagem. Isto quer dizer que esta assinatura \u00e9 \u00fanica para cada corpo e cabe\u00e7alho da mensagem. Ao enviar um e-mail, o servidor de destino faz uma pesquisa ao DNS do dom\u00ednio do remetente e, se no campo &#8220;de&#8221; a assinatura DKIM est\u00e1 configurada, recebe a chave p\u00fablica do dom\u00ednio e a usa para descriptografar o valor da assinatura do campo do cabe\u00e7alho e recalcular o valor da assinatura para a mensagem (cabe\u00e7alho e corpo) que recebeu o e-mail.<\/p>\n<p>Estes dois valores devem corresponder e assim se comprova a autenticidade da mensagem, com um sistema de integridade de dados de extremo a extremo\u00a0 (de um m\u00f3dulo que est\u00e1 assinando para um m\u00f3dulo que est\u00e1 validando), o que d\u00e1 ao sistema DKIM muitas vantagens sobre outros sistemas utilizados para evitar o e-mail n\u00e3o desejado, pois o SPF, uma vez que torna mais dif\u00edcil a falsifica\u00e7\u00e3o de identidade do remetente.<\/p>\n<p>O DKIM tem algumas desvantagens inerentes \u00e0 sua opera\u00e7\u00e3o, como o consumo de recursos dos servidores (envolve a realiza\u00e7\u00e3o de processos de criptografia e processos de descodifica\u00e7\u00e3o para cada e-mail, tanto para o emissor quanto para o receptor) ou o problema da modifica\u00e7\u00e3o do conte\u00fado dos e-mails em tr\u00e2nsito (que anula a comprova\u00e7\u00e3o da chave gerada pelo conte\u00fado), mas este problema j\u00e1 est\u00e1 sendo resolvido e \u00e9 cada vez mais utilizado, sendo que melhora muito a reputa\u00e7\u00e3o dos dom\u00ednios que o implementam para realizar os envios das suas mensagens eletr\u00f4nicas. Por este motivo, recomendamos que os usu\u00e1rios de<strong><span style=\"color: #0000ff;\"> Mail<\/span>relay<\/strong> o fa\u00e7am a configura\u00e7\u00e3o para utiliz\u00e1-lo.<\/p>\n<div>\n<div style=\"color: #ffffff; background-color: #0573be; padding: 15px; padding-top: 2px; margin-bottom: 10px;\">\n<h4><strong>Como configurar o sistema DKIM para utiliza\u00e7\u00e3o com<span style=\"color: #0000ff;\"> Mail<\/span>relay?<\/strong><\/h4>\n<p>Se voc\u00ea \u00e9 um usu\u00e1rio da vers\u00e3o Enterprise (a standard n\u00e3o a inclui) solicite a equipe de <strong><span style=\"color: #0000ff;\">Mail<\/span>relay<\/strong> a ativa\u00e7\u00e3o do sistema.<\/p>\n<p>Ap\u00f3s fazer isso, entre em contato com sua hospedagem ou webmaster e explique que no dom\u00ednio a ser utilizado como remetente, por exemplo meudominio.com deve ser criado esse subdom\u00ednio relativo a este dom\u00ednio:<br \/>\ndkim._domainkey.meudominio.com<\/p>\n<p>e configure esses registros em TXT em cada um deles da forma correta, como mostrado:<\/p>\n<p>para dkim._domainkey.midominio.com um registro TXT (tudo na mesma linha, sem quebras):<\/p>\n<div style=\"width: 570px; word-break: break-all;\">k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDSAHkvh8dRCsiMTud+hfC+MX2MgmO8PQHHcGxoim7mI+FhgOiOS5WgBUpZsZ60M2eLhBbJkMFLjC1OS0xDf9suh+Tl4tVirMXnWIS+zrR1xLX15\/ItB7+x8FG4HHR5aD8BB4OHCTk3WjzF5YU\/KFx0riP\/wsU7Z5XRK6OwwNcCTQIDAQAB;<\/div>\n<p>Para poder validar a configura\u00e7\u00e3o, voc\u00ea pode simplesmente enviar um email de teste atrav\u00e9s da sua conta da Mailrelay usando o dom\u00ednio remetente onde voc\u00ea configurou o DKIM, para o Gmail ou Yahoo, e clicar na op\u00e7\u00e3o Mostrar original. Se a configura\u00e7\u00e3o est\u00e1 correta e j\u00e1 propagou, no cabe\u00e7alho da mensagem, voc\u00ea dever\u00e1 ver o texto dkim=pass<\/p>\n<\/div>\n<p><a href=\"http:\/\/mailrelay.com\/es\/alta\/index\/key\/blog\/campaign\/M-RED-B\/\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" title=\"mailrelay_email_marketing\" src=\"https:\/\/wpstaging.mailrelay.com\/wp-content\/uploads\/2012\/07\/mailrelay_email_marketing.jpg\" alt=\"Mailrelay, email marketing\" \/><\/a><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>O sistema DKIM (DomainKeys Identified Mail) \u00e9 uma evolu\u00e7\u00e3o do sistema DomainKeys inicialmente desenvolvido por Yahoo como um mecanismo para que um e-mail possa ser validado por um destinat\u00e1rio, comprovando de forma inequ\u00edvoca que a sua origem \u00e9 realmente a que aparece nos cabe\u00e7alhos do e-mail. Na verdade n\u00e3o \u00e9 um sistema projetado especificamente para [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":968,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","footnotes":""},"categories":[67,66],"tags":[],"class_list":["post-41637","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-avanzado","category-tutoriales"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>O que \u00e9, e como funciona o sistema DKIM - Mailrelay<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"O que \u00e9, e como funciona o sistema DKIM - Mailrelay\" \/>\n<meta property=\"og:description\" content=\"O sistema DKIM (DomainKeys Identified Mail) \u00e9 uma evolu\u00e7\u00e3o do sistema DomainKeys inicialmente desenvolvido por Yahoo como um mecanismo para que um e-mail possa ser validado por um destinat\u00e1rio, comprovando de forma inequ\u00edvoca que a sua origem \u00e9 realmente a que aparece nos cabe\u00e7alhos do e-mail. 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