{"id":7822,"date":"2021-03-23T11:17:46","date_gmt":"2021-03-23T11:17:46","guid":{"rendered":"https:\/\/198.27.90.141\/?p=7822"},"modified":"2026-09-29T18:35:20","modified_gmt":"2026-09-29T18:35:20","slug":"o-que-sao-dmarc-dkim-spf","status":"publish","type":"post","link":"https:\/\/gatefy.com\/pt-br\/blog\/o-que-sao-dmarc-dkim-spf\/","title":{"rendered":"O que s\u00e3o DMARC, DKIM e SPF? Por que a sua empresa deve adot\u00e1-los?"},"content":{"rendered":"<p>DMARC, SPF e DKIM s\u00e3o\u00a0<a href=\"https:\/\/gatefy.com\/pt-br\/blog\/razoes-usar-dmarc-proteger-dominio-empresa\/\" target=\"_blank\" rel=\"noopener\">protocolos de autentica\u00e7\u00e3o e valida\u00e7\u00e3o de e-mails<\/a>. S\u00e3o tecnologias que melhoram a seguran\u00e7a de e-mail da sua empresa e ainda garantem que voc\u00ea melhore a taxa ou a capacidade de entrega de e-mails. Todos eles devem ser implantados no DNS do seu nome de dom\u00ednio.<\/p>\n<p>N\u00f3s n\u00e3o vamos mentir. Implantar DMARC, SPF e DKIM pode n\u00e3o ser uma tarefa t\u00e3o simples. Mas vale muito a pena e, para facilitar, existem ferramentas que simplificam a ado\u00e7\u00e3o destes protocolos, como o\u00a0<a href=\"https:\/\/gatefy.com\/pt-br\/protecao-antifraude-dmarc\/\" target=\"_blank\" rel=\"noopener\"><strong>Gatefy Anti-Fraud Protection<\/strong><\/a>.<\/p>\n<p>Depois que voc\u00ea entende a import\u00e2ncia do SPF, DKIM e DMARC e a forma como eles se complementam e atuam na prote\u00e7\u00e3o de e-mail, voc\u00ea percebe que vale a pena investir em aprender sobre eles e como adot\u00e1-los.<\/p>\n<p><a href=\"https:\/\/gatefy.com\/pt-br\/blog\/webinar-seguranca-email-empresa-dmarc-spf-dkim\/\" target=\"_blank\" rel=\"noopener\">Assista aqui ao webinar da Gatefy sobre Seguran\u00e7a de e-mail para empresas com DMARC, SPF e DKIM.<\/a><\/p>\n<h2>Para come\u00e7ar, o que \u00e9 SPF?<\/h2>\n<p><a href=\"https:\/\/gatefy.com\/pt-br\/blog\/o-que-e-spf-sender-policy-framework\/\" target=\"_blank\" rel=\"noopener\">Sender Policy Framework (SPF)<\/a> \u00e9 um protocolo de seguran\u00e7a de e-mail que permite \u00e0 empresa determinar quem pode enviar e-mails do seu dom\u00ednio. Na pr\u00e1tica, a sua empresa especifica quais endere\u00e7os de IP podem enviar e-mail do seu dom\u00ednio.<\/p>\n<p>O SPF \u00e9 muito utilizado para prevenir ataques de personifica\u00e7\u00e3o, quando algu\u00e9m tenta usar o seu dom\u00ednio fingindo ser voc\u00ea. Ou seja, \u00e9 uma \u00f3tima solu\u00e7\u00e3o para combater campanhas de phishing, engenharia social e spam.<\/p>\n<p>Para saber mais sobre o SPF, visite\u00a0<a href=\"http:\/\/www.open-spf.org\/\" target=\"_blank\" rel=\"noopener\">openspf.org<\/a>.<\/p>\n<h2>O que \u00e9 DKIM?<\/h2>\n<p><a href=\"https:\/\/gatefy.com\/pt-br\/blog\/o-que-e-dkim-domainkeys-identified-mail\/\" target=\"_blank\" rel=\"noopener\">DomainKeys Identified Mail (DKIM)<\/a> \u00e9 um protocolo de prote\u00e7\u00e3o de e-mail baseado em criptografia. Ele garante que o conte\u00fado do e-mail \u00e9 leg\u00edtimo e aut\u00eantico. Ou seja, n\u00e3o foi comprometido ou violado.<\/p>\n<p>Na pr\u00e1tica, o DKIM funciona usando uma chave privada e uma chave p\u00fablica. A chave privada \u00e9 usada para criptografar uma assinatura nos cabe\u00e7alhos dos e-mails enviados. Por outro lado, a chave p\u00fablica, publicada no DNS de um dom\u00ednio, \u00e9 usada para descriptografar a assinatura e verificar a autenticidade do e-mail.<\/p>\n<p>O DKIM \u00e9 muito utilizado para impedir ataques do tipo \u201cman in the middle\u201d e campanhas de\u00a0<a href=\"https:\/\/gatefy.com\/pt-br\/blog\/casos-reais-famosos-bec-business-email-compromise\/\" target=\"_blank\" rel=\"noopener\">BEC (Business Email Compromise)<\/a>, garantindo que o e-mail n\u00e3o foi modificado durante a jornada entre o remetente e o destinat\u00e1rio.<\/p>\n<p>Para saber mais sobre DKIM, acesse\u00a0<a href=\"http:\/\/dkim.org\/\" target=\"_blank\" rel=\"noopener\">dkim.org<\/a>.<\/p>\n<h2>O que \u00e9 DMARC?<\/h2>\n<p style=\"box-sizing: border-box; outline: none; margin-left: 0px; margin-right: 0px; padding: 0px; font-size: var(--font20); line-height: 1.7em; color: #000000; font-family: roboto, Helvetica, sans-serif;\">Domain-based Message Authentication Reporting &amp; Conformance (DMARC) \u00e9 um protocolo de seguran\u00e7a de e-mail que usa o SPF e o DKIM para padronizar a maneira como e-mails s\u00e3o autenticados e validados.<\/p>\n<p style=\"box-sizing: border-box; outline: none; margin-left: 0px; margin-right: 0px; padding: 0px; font-size: var(--font20); line-height: 1.7em; color: #000000; font-family: roboto, Helvetica, sans-serif;\">Na pr\u00e1tica, o DMARC fornece instru\u00e7\u00f5es de a\u00e7\u00e3o para servidores de e-mails em casos de ataques e de falhas de autentica\u00e7\u00e3o. Al\u00e9m disso, o DMARC fornece\u00a0<a style=\"box-sizing: border-box; outline: none; margin-left: 0px; margin-right: 0px; padding: 0px; text-decoration-line: none;\" href=\"https:\/\/gatefy.com\/pt-br\/blog\/o-que-sao-rua-e-ruf-dmarc\/\" target=\"_blank\" rel=\"noopener\">relat\u00f3rios para o propriet\u00e1rio do dom\u00ednio<\/a>, permitindo que ele tenha visibilidade e controle sobre o uso do seu dom\u00ednio e da sua marca.<\/p>\n<p style=\"box-sizing: border-box; outline: none; margin-left: 0px; margin-right: 0px; padding: 0px; font-size: var(--font20); line-height: 1.7em; color: #000000; font-family: roboto, Helvetica, sans-serif;\">Para saber mais sobre DMARC, acesse\u00a0<a style=\"box-sizing: border-box; outline: none; margin-left: 0px; margin-right: 0px; padding: 0px; text-decoration-line: none;\" href=\"http:\/\/dmarc.org\/\" target=\"_blank\" rel=\"noopener\">dmarc.org<\/a>.<\/p>\n<h2>Por que a sua empresa deveria adotar DMARC, SPF e DKIM<\/h2>\n<p>O e-mail \u00e9 t\u00e3o popular que se tornou o principal vetor de amea\u00e7as cibern\u00e9ticas.\u00a0<a href=\"https:\/\/gatefy.com\/pt-br\/blog\/relatorio-da-verizon-ransomware-phishing-bec\/\" target=\"_blank\" rel=\"noopener\">Dados da Verizon<\/a>\u00a0apontam, por exemplo, que de cada 10 tentativas de infec\u00e7\u00e3o usando malware, 9 acontecem via e-mails.<\/p>\n<p><a href=\"https:\/\/gatefy.com\/pt-br\/blog\/bec-phishing-continuam-moda-diz-relatorio-fbi\/\" target=\"_blank\" rel=\"noopener\">De acordo com o FBI<\/a>, o golpe de phishing, que geralmente ocorre via e-mails, \u00e9 o tipo de cibercrime mais cometido no mundo.<\/p>\n<p>Al\u00e9m disso, os ataques de BEC representam quase a metade de todo o preju\u00edzo causado por ciberataques no ano passado. Em 2019, os golpes de BEC causaram perdas de USD 1,7 bilh\u00e3o.<\/p>\n<p>Em outras palavras, um dos principais motivos para a ado\u00e7\u00e3o de DMARC, SPF e DKIM \u00e9 justamente combater e detectar amea\u00e7as, como\u00a0<a href=\"https:\/\/gatefy.com\/pt-br\/blog\/como-o-spam-prejudica-sua-empresa\/\" target=\"_blank\" rel=\"noopener\">spam<\/a>, phishing, BEC, personifica\u00e7\u00e3o e golpes de C-level.<\/p>\n<p>Juntos, esses tr\u00eas protocolos de seguran\u00e7a de e-mail impedem que a marca da sua empresa seja usada em golpes e fraudes que podem afetar os seus funcion\u00e1rios, clientes e parceiros.<\/p>\n<p>Outras raz\u00f5es para implantar DMARC, SPF e DKIM s\u00e3o: garantir que os seus e-mails sejam confi\u00e1veis, ganhar visibilidade sobre o seu dom\u00ednio, e ainda melhorar a sua capacidade de entrega de e-mails.<\/p>\n<h2>Governos de v\u00e1rios pa\u00edses t\u00eam adotado o DMARC<\/h2>\n<p>Nos \u00faltimos anos, governos de v\u00e1rios pa\u00edses t\u00eam investido forte na ado\u00e7\u00e3o do DMARC.<\/p>\n<p>Tudo come\u00e7ou com o Reino Unido, em 2016, exigindo que os \u00f3rg\u00e3os do governo implementassem o DMARC e os outros protocolos de seguran\u00e7a de e-mail.<\/p>\n<p>Em 2017, foi a vez dos Estados Unidos. No ano de 2018, os governos da Holanda e da Nova Zel\u00e2ndia tamb\u00e9m fizeram a mesma exig\u00eancia sobre a ado\u00e7\u00e3o do DMARC. Em 2019, a Austr\u00e1lia tamb\u00e9m.<\/p>\n<p>Em 2020, o Canad\u00e1 e a Dinamarca est\u00e3o colocando em pr\u00e1tica uma pol\u00edtica de ado\u00e7\u00e3o massiva de prote\u00e7\u00e3o para os dom\u00ednios de e-mail do governo.<\/p>\n<p>A prop\u00f3sito, devido ao DMARC, o Reino Unido j\u00e1 impediu, no prazo de um ano, que cerca de 80 milh\u00f5es de e-mails falsificados entrassem em dom\u00ednios governamentais. \u00c9 um n\u00famero impressionante.<\/p>\n<p>Se os governos est\u00e3o adotando o DMARC, por que a sua empresa n\u00e3o poderia adot\u00e1-lo tamb\u00e9m?<\/p>\n<h2>Como implantar DMARC, DKIM e SPF<\/h2>\n<p>N\u00f3s sempre recomendamos que a implanta\u00e7\u00e3o de DMARC, DKIM e SPF sejam feitas em etapas. A maneira mais f\u00e1cil \u00e9 come\u00e7ar com o\u00a0SPF, depois passar para o DKIM e, por fim, adotar o DMARC.<\/p>\n<p>Para evitar erros de configura\u00e7\u00e3o e perda de tempo e dinheiro, \u00e9 preciso estudar em detalhes os protocolos. O DMARC e o DKIM, inclusive, s\u00e3o conhecidos por serem dif\u00edceis de serem configurados.<\/p>\n<p>A boa not\u00edcia \u00e9 que h\u00e1 solu\u00e7\u00f5es que facilitam essa implanta\u00e7\u00e3o. Com a ajuda do Gatefy Anti-Fraud Protection, a sua empresa adota DMARC, DKIM e SPF de modo f\u00e1cil e r\u00e1pido. \u00c9 muito simples.<\/p>\n<p>Deste modo, voc\u00ea tem visibilidade e controle sobre os seus dom\u00ednios, inclusive, recebendo informa\u00e7\u00f5es sobre qualquer atividade maliciosa que possa afetar os seus funcion\u00e1rios, clientes e parceiros.<\/p>\n<p><a href=\"https:\/\/gatefy.com\/pt-br\/protecao-antifraude-dmarc\/\" target=\"_blank\" rel=\"noopener\"><strong>Leia mais sobre a nossa solu\u00e7\u00e3o DMARC aqui.<\/strong><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>DMARC, SPF e DKIM s\u00e3o\u00a0protocolos de autentica\u00e7\u00e3o e valida\u00e7\u00e3o de e-mails. S\u00e3o tecnologias que melhoram a seguran\u00e7a de e-mail da sua empresa e ainda garantem que voc\u00ea melhore a taxa ou a capacidade de entrega de e-mails. Todos eles devem ser implantados no DNS do seu nome de dom\u00ednio. N\u00f3s n\u00e3o vamos mentir. Implantar DMARC, [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":7823,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2,37],"tags":[],"class_list":["post-7822","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-educacao"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>DMARC, DKIM e SPF: o que s\u00e3o e por que adot\u00e1-los? - Gatefy<\/title>\n<meta name=\"description\" content=\"DMARC, DKIM e SPF s\u00e3o protocolos de autentica\u00e7\u00e3o de e-mail, que fortalecem a seguran\u00e7a da empresa e melhoram sua capacidade de entrega.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/gatefy.com\/pt-br\/blog\/o-que-sao-dmarc-dkim-spf\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"DMARC, DKIM e SPF: o que s\u00e3o e por que adot\u00e1-los? - Gatefy\" \/>\n<meta property=\"og:description\" content=\"DMARC, DKIM e SPF s\u00e3o protocolos de autentica\u00e7\u00e3o de e-mail, que fortalecem a seguran\u00e7a da empresa e melhoram sua capacidade de entrega.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/gatefy.com\/pt-br\/blog\/o-que-sao-dmarc-dkim-spf\/\" \/>\n<meta property=\"og:site_name\" content=\"Gatefy\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/gatefy\" \/>\n<meta property=\"article:published_time\" content=\"2021-03-23T11:17:46+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-09-29T18:35:20+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/gatefy.com\/wp-content\/uploads\/2021\/03\/dmarc-dkim-spf.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"800\" \/>\n\t<meta property=\"og:image:height\" content=\"400\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Gatefy\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@gatefy_security\" \/>\n<meta name=\"twitter:site\" content=\"@gatefy_security\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"Gatefy\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. tempo de leitura\" \/>\n\t<meta name=\"twitter:data2\" content=\"9 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/gatefy.com\\\/pt-br\\\/blog\\\/o-que-sao-dmarc-dkim-spf\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/gatefy.com\\\/pt-br\\\/blog\\\/o-que-sao-dmarc-dkim-spf\\\/\"},\"author\":{\"name\":\"Gatefy\",\"@id\":\"https:\\\/\\\/gatefy.com\\\/pt-br\\\/#\\\/schema\\\/person\\\/b305fce8ec3405a5f903af11c0b6bd94\"},\"headline\":\"O que s\u00e3o DMARC, DKIM e SPF? 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