{"id":8774,"date":"2021-01-12T13:57:26","date_gmt":"2021-01-12T13:57:26","guid":{"rendered":"https:\/\/kb.mailfence.com\/kb\/como-configurar-a-defesa-anti-spoofing-para-meu-dominio\/"},"modified":"2025-02-03T09:13:24","modified_gmt":"2025-02-03T09:13:24","slug":"configurar-a-defesa-anti-spoofing","status":"publish","type":"ht_kb","link":"https:\/\/kb.mailfence.com\/pt\/kb\/configurar-a-defesa-anti-spoofing\/","title":{"rendered":"Defesa contra spoofing: Como configurar para o seu dom\u00ednio?"},"content":{"rendered":"\n<p class=\"has-text-align-center\"><\/p>\n\n\n\n<p>Para criar uma defesa contra spoofing, voc\u00ea n\u00e3o precisar\u00e1 fazer nenhuma modifica\u00e7\u00e3o se estiver usando apenas endere\u00e7os baseados no nome de dom\u00ednio mailfence.com. No entanto, se voc\u00ea tiver <a href=\"https:\/\/kb.mailfence.com\/kb\/custom-domain-based-addresses-in-mailfence-account\/\">adicionado seu pr\u00f3prio nome de dom\u00ednio<\/a>, dever\u00e1 configurar as seguintes entradas de DNS para evitar <a href=\"https:\/\/blog.mailfence.com\/pt\/spoofing-como-proteja-se\/\">falsifica\u00e7\u00e3o de e-mail<\/a> e garantir a capacidade de entrega:<\/p>\n\n\n\n<div class=\"wp-block-ht-block-toc  is-style-outline htoc htoc--position-wide toc-list-style-plain\" data-htoc-state=\"expanded\"><span class=\"htoc__title\"><span class=\"ht_toc_title\">\u00cdndice<\/span><span class=\"htoc__toggle\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\"><g fill=\"#444\"><path d=\"M15 7H1c-.6 0-1 .4-1 1s.4 1 1 1h14c.6 0 1-.4 1-1s-.4-1-1-1z\"><\/path><path d=\"M15 1H1c-.6 0-1 .4-1 1s.4 1 1 1h14c.6 0 1-.4 1-1s-.4-1-1-1zM15 13H1c-.6 0-1 .4-1 1s.4 1 1 1h14c.6 0 1-.4 1-1s-.4-1-1-1z\"><\/path><\/g><\/svg><\/span><\/span><div class=\"htoc__itemswrap\"><ul class=\"ht_toc_list\"><li class=\"\"><a href=\"#h-estrutura-de-politica-de-remetente-spf\">Estrutura de pol\u00edtica de remetente (SPF):<\/a><\/li><li class=\"\"><a href=\"#h-correio-identificado-por-chaves-de-dominio-dkim\">Correio identificado por chaves de dom\u00ednio (DKIM)<\/a><\/li><li class=\"\"><a href=\"#h-autenticacao-relatorio-e-conformidade-de-mensagens-baseadas-em-dominio-dmarc\">Autentica\u00e7\u00e3o, relat\u00f3rio e conformidade de mensagens baseadas em dom\u00ednio (DMARC)<\/a><\/li><li class=\"\"><a href=\"#h-agente-de-transferencia-de-correio-seguranca-estrita-de-transporte-mta-sts\">Agente de transfer\u00eancia de correio &#8211; Seguran\u00e7a estrita de transporte (MTA-STS)<\/a><\/li><\/ul><\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-estrutura-de-politica-de-remetente-spf\">Estrutura de pol\u00edtica de remetente (SPF):<\/h2>\n\n\n\n<p>1. Acesse sua conta <strong>Settings <strong>\u2192<\/strong> Messages <strong>\u2192<\/strong> E-mail domains<\/strong>.<\/p>\n\n\n\n<p>2. Na <strong>entrada de<\/strong> seu <strong>nome de dom\u00ednio<\/strong>, clique em <strong>SPF<\/strong>.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"976\" height=\"256\" src=\"https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-3.png\" alt=\"defesa contra spoofing - SPF\" class=\"wp-image-4234\" srcset=\"https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-3.png 976w, https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-3-300x79.png 300w, https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-3-768x201.png 768w, https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-3-50x13.png 50w, https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-3-60x16.png 60w, https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-3-100x26.png 100w\" sizes=\"auto, (max-width: 976px) 100vw, 976px\" \/><figcaption class=\"wp-element-caption\"><strong>Copie<\/strong> o valor do registro SPF para adicion\u00e1-lo ao seu nome de dom\u00ednio, hospedagem ou provedor de servi\u00e7os de DNS.<\/figcaption><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-ht-blocks-messages wp-block-hb-message wp-block-hb-message--withicon is-style-info\">Um registro TXT \u00e9 um tipo de <a href=\"https:\/\/pt.wikipedia.org\/wiki\/Sistema_de_Nomes_de_Dom%C3%ADnio\">registro de recurso<\/a> no sistema de nomes de dom\u00ednio (DNS). Leia mais <a href=\"https:\/\/en.wikipedia.org\/wiki\/TXT_record\">aqui<\/a>. <strong>Consulte a documenta\u00e7\u00e3o do seu provedor de servi\u00e7os de nomes de dom\u00ednio para obter as etapas exatas sobre como adicionar um registro TXT.<\/strong> <\/p>\n\n\n\n<p class=\"wp-block-ht-blocks-messages wp-block-hb-message wp-block-hb-message--withicon is-style-info\">Os registros de DNS podem levar algum tempo para se propagar. Voc\u00ea pode usar <a href=\"https:\/\/www.whatsmydns.net\/\">essa ferramenta<\/a> para verificar. <\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-se-os-e-mails-forem-enviados-somente-usando-servidores-mailfence-com-webmail-smtpauth-activesync-encaminhamento-use-o-seguinte-valor-v-spf1-include-spf-mailfence-com-all\">Se os e-mails forem enviados somente usando servidores mailfence.com (webmail, SMTPAuth, ActiveSync, encaminhamento), use o seguinte valor:<br>v=spf1 include:_spf.mailfence.com <strong>-all<\/strong><\/li>\n\n\n\n<li id=\"htoc-se-os-e-mails-tamb-m-forem-enviados-de-outros-servidores-use-o-seguinte-valor-v-spf1-include-spf-mailfence-com-all\">Se os e-mails tamb\u00e9m forem enviados de outros servidores, use o seguinte valor:<br>v=spf1 include:_spf.mailfence.com <strong>~all<\/strong><\/li>\n<\/ul>\n\n\n\n<p>3. Quando o respectivo registro DNS TXT tiver sido inclu\u00eddo com \u00eaxito, clique em <strong>Verify (Verificar<\/strong>).<\/p>\n\n\n\n<p>Observa\u00e7\u00e3o: Caso voc\u00ea planeje<a href=\"https:\/\/pt.wikipedia.org\/wiki\/Sender_Policy_Framework\">&#8220;incluir<\/a>&#8221; v\u00e1rias entradas de registro SPF para continuar autenticando e-mails enviados de outros provedores, esteja ciente do <a href=\"https:\/\/tools.ietf.org\/html\/rfc7208#section-4.6.4\">limite de 10 pesquisas SPF<\/a>, que pode levar \u00e0 falha na autentica\u00e7\u00e3o SPF no lado receptor. Voc\u00ea pode nivelar automaticamente seus registros SPF usando qualquer servi\u00e7o externo de sua escolha, por exemplo, <a href=\"https:\/\/autospf.com\/\">autospf.com<\/a> (vem com um plano gratuito), etc.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-correio-identificado-por-chaves-de-dominio-dkim\"><strong>Correio identificado por chaves de dom\u00ednio (DKIM)<\/strong><\/h2>\n\n\n\n<p>1. Voc\u00ea pode continuar no assistente acima clicando em <strong>Next (Avan\u00e7ar<\/strong>), OU se estiver fazendo isso mais tarde:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li id=\"htoc-acesse-sua-conta-settings-messages-e-mail-domains\">Acesse sua conta <strong>Settings <strong>\u2192<\/strong> Messages <strong>\u2192<\/strong> E-mail domains<\/strong>.<\/li>\n\n\n\n<li id=\"htoc-na-entrada-de-seu-nome-de-dom-nio-clique-em-dkim\">Na <strong>entrada de<\/strong> seu <strong>nome de dom\u00ednio<\/strong>, clique em <strong>DKIM<\/strong>.<\/li>\n<\/ol>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"976\" height=\"349\" src=\"https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-4.png\" alt=\"Defesa contra spoofing - DKIM\" class=\"wp-image-4235\" srcset=\"https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-4.png 976w, https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-4-300x107.png 300w, https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-4-768x275.png 768w, https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-4-50x18.png 50w, https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-4-60x21.png 60w, https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-4-100x36.png 100w\" sizes=\"auto, (max-width: 976px) 100vw, 976px\" \/><figcaption class=\"wp-element-caption\"><strong>Copie<\/strong> os valores de nome\/hospedagem e registro DKIM para adicion\u00e1-los ao seu nome de dom\u00ednio, hospedagem ou provedor de servi\u00e7os DNS.<\/figcaption><\/figure>\n<\/div>\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-recomenda-se-que-voc-use-um-par-de-chaves-dkim-de-2048-bits-caso-seu-nome-de-dom-nio-hospedagem-ou-provedor-de-servi-os-de-dns-n-o-ofere-a-suporte-a-valores-txt-de-dns-longos-clique-em-generate-a-1024-bits-key-gerar-uma-chave-de-1024-bits\"><strong>Recomenda-se que voc\u00ea use um par de chaves DKIM de 2048 bits<\/strong>.\nCaso seu nome de dom\u00ednio\/hospedagem ou provedor de servi\u00e7os de DNS n\u00e3o ofere\u00e7a suporte a valores TXT de DNS longos, clique em &#8220;generate a 1024 bits key&#8221; (gerar uma chave de 1024 bits). <\/li>\n\n\n\n<li id=\"htoc-para-alterar-ou-alternar-o-par-de-chaves-dkim-consulte-este-artigo-da-kb\">Para alterar (ou alternar) o par de chaves DKIM, consulte <a href=\"https:\/\/kb.mailfence.com\/pt\/?post_type=ht_kb&amp;p=6344\">este artigo da KB<\/a>.<\/li>\n<\/ul>\n\n\n\n<p>3. Quando o respectivo registro DNS TXT tiver sido inclu\u00eddo com \u00eaxito, clique em <strong>Verify (Verificar<\/strong>).<\/p>\n\n\n\n<p class=\"wp-block-ht-blocks-messages wp-block-hb-message wp-block-hb-message--withicon is-style-info\">Os registros de DNS podem levar algum tempo para se propagar. Voc\u00ea pode usar <a href=\"https:\/\/www.whatsmydns.net\/\">essa ferramenta<\/a> para verificar. <\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Se uma ferramenta externa verificar a exist\u00eancia de sua chave DKIM, mas a valida\u00e7\u00e3o ainda falhar no Mailfence, <em>configure <a href=\"https:\/\/tools.ietf.org\/html\/draft-allman-dkim-ssp-02\">a pol\u00edtica de assinatura DKIM<\/a><\/em> criando o seguinte <strong>registro DNS TXT<\/strong>:<br>Name\/Host: <strong>_domainkey<\/strong><br>Valor: <strong>o=~<\/strong>\n<ul class=\"wp-block-list\">\n<li id=\"htoc-o-refere-se-a-alguns-mas-nem-todos-os-e-mails-desse-dom-nio-s-o-assinados\">&#8220;o=~&#8221; refere-se a &#8220;alguns, mas nem todos os e-mails desse dom\u00ednio s\u00e3o assinados&#8221;.<\/li>\n\n\n\n<li id=\"htoc-o-refere-se-a-todos-os-e-mails-deste-dom-nio-s-o-assinados\">&#8220;o=-&#8221; refere-se a &#8220;todos os e-mails deste dom\u00ednio s\u00e3o assinados&#8221;.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li id=\"htoc-os-e-mails-s-ser-o-assinados-pelo-dkim-depois-que-o-respectivo-registro-dkim-tiver-sido-validado\">Os e-mails s\u00f3 ser\u00e3o assinados pelo DKIM depois que o respectivo registro DKIM tiver sido validado. (defesa contra spoofing)<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator aligncenter has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading has-text-align-center\" id=\"h-opcional\">Opcional<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-autenticacao-relatorio-e-conformidade-de-mensagens-baseadas-em-dominio-dmarc\"><strong>Autentica\u00e7\u00e3o, relat\u00f3rio e conformidade de mensagens baseadas em dom\u00ednio (DMARC)<\/strong><\/h2>\n\n\n\n<p>1. Voc\u00ea pode continuar no assistente acima clicando em <strong>Next (Avan\u00e7ar<\/strong>), OU se estiver fazendo isso mais tarde:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li id=\"htoc-acesse-sua-conta-settings-messages-e-mail-domains1\">Acesse sua conta <strong>Settings <strong>\u2192<\/strong> Messages \u2192 E-mail domains<\/strong>.<\/li>\n\n\n\n<li id=\"htoc-na-entrada-do-seu-nome-de-dom-nio-clique-em-qualquer-uma-das-entradas-de-dns-dmarc-opcional\">Na entrada do seu nome de dom\u00ednio, <strong>clique em qualquer uma das entradas de DNS<\/strong> <strong>\u2192<\/strong> <strong>DMARC (opcional)<\/strong>.<\/li>\n<\/ol>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"342\" src=\"https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-7-1024x342.png\" alt=\"\" class=\"wp-image-4239\" srcset=\"https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-7-1024x342.png 1024w, https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-7-300x100.png 300w, https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-7-768x256.png 768w, https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-7-50x17.png 50w, https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-7-60x20.png 60w, https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-7-100x33.png 100w, https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-7.png 1075w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\"><strong>Copie<\/strong> os valores do DMARC Name\/Host e do registro para adicion\u00e1-los ao seu nome de dom\u00ednio, hospedagem ou provedor de servi\u00e7os de DNS.<\/figcaption><\/figure>\n<\/div>\n\n\n<p>2. Antes de clicar em validar:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A entrada DMARC sugerida \u00e9 <em>somente de relat\u00f3rio<\/em> (ou seja, voc\u00ea receber\u00e1 relat\u00f3rios DMARC indicando tentativas de falsifica\u00e7\u00e3o de seus endere\u00e7os baseados em dom\u00ednio).\nCertifique-se de que voc\u00ea substituiu &#8220;[YOUR-EMAIL-ADDRESS]&#8221; por um <strong>endere\u00e7o existente baseado no nome de dom\u00ednio que acabou de adicionar<\/strong>.\nVoc\u00ea receber\u00e1 um relat\u00f3rio DMARC (por exemplo, diariamente) de servidores de e-mail que suportam o envio de relat\u00f3rios DMARC agregados.  \n<ul class=\"wp-block-list\">\n<li id=\"htoc-se-o-endere-o-de-e-mail-na-tag-rua-mailto-n-o-for-baseado-em-um-nome-de-dom-nio-que-voc-acabou-de-adicionar-ser-necess-ria-uma-autoriza-o-de-relat-rio-externo\">Se o endere\u00e7o de e-mail na tag <strong>rua=mailto:<\/strong> n\u00e3o for baseado em um nome de dom\u00ednio que voc\u00ea acabou de adicionar, ser\u00e1 necess\u00e1ria <a href=\"https:\/\/dmarc.org\/2015\/08\/receiving-dmarc-reports-outside-your-domain\/\">uma autoriza\u00e7\u00e3o de relat\u00f3rio externo<\/a>.<\/li>\n\n\n\n<li id=\"htoc-voc-pode-parar-de-receber-relat-rios-dmarc-a-qualquer-momento\">Voc\u00ea pode <a href=\"https:\/\/kb.mailfence.com\/kb\/how-can-i-stop-receiving-dmarc-reports\/\">parar de receber relat\u00f3rios DMARC<\/a> a qualquer momento.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li id=\"htoc-o-p-especifica-a-a-o-a-ser-tomada-para-e-mails-que-falharem-no-dmarc-e-nenhum-significa-basicamente-n-o-fazer-nada-se-houver-falha-no-spf-e-ou-dkim-e-seguir-a-pol-tica-do-destinat-rio-as-outras-op-es-s-o-quarentena-e-rejei-o-certifique-se-de-que-voc-entenda-os-riscos-envolvidos-na-entrega-de-e-mails-antes-de-usar-uma-pol-tica-diferente-de-nenhuma\">O <strong>&#8216;p=&#8217;<\/strong> especifica a a\u00e7\u00e3o a ser tomada para e-mails que falharem no DMARC e <em>nenhum<\/em> significa basicamente n\u00e3o fazer nada (se houver falha no SPF e\/ou DKIM) e seguir a pol\u00edtica do destinat\u00e1rio. As outras op\u00e7\u00f5es s\u00e3o <em>quarentena<\/em> e <em>rejei\u00e7\u00e3o<\/em>. Certifique-se de que voc\u00ea entenda os <a href=\"https:\/\/pt.wikipedia.org\/wiki\/DMARC\">riscos envolvidos na entrega de e-mails<\/a> antes de usar uma pol\u00edtica diferente de <em>nenhuma<\/em>.<\/li>\n\n\n\n<li id=\"htoc-se-voc-j-tiver-um-registro-dns-txt-com-o-nome-host-dmarc-para-o-seu-dom-nio-edite-esse-registro-em-vez-de-criar-um-novo-isso-importante-pois-voc-n-o-pode-ter-v-rios-registros-dmarc-para-um-determinado-dom-nio\">Se voc\u00ea j\u00e1 tiver um registro DNS TXT com o nome\/host <strong>&#8220;_dmarc&#8221;<\/strong> para o seu dom\u00ednio, edite esse registro em vez de criar um novo.\nIsso \u00e9 importante, pois voc\u00ea n\u00e3o pode ter v\u00e1rios registros DMARC para um determinado dom\u00ednio. <\/li>\n<\/ul>\n\n\n\n<p>3. Quando o respectivo registro DNS TXT tiver sido inclu\u00eddo com \u00eaxito, clique em <strong>Verify (Verificar<\/strong>).<\/p>\n\n\n\n<p class=\"wp-block-ht-blocks-messages wp-block-hb-message wp-block-hb-message--withicon is-style-info\">Os registros de DNS podem levar algum tempo para se propagar. Voc\u00ea pode usar <a href=\"https:\/\/www.whatsmydns.net\/\">essa ferramenta<\/a> para verificar.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-agente-de-transferencia-de-correio-seguranca-estrita-de-transporte-mta-sts\"><strong>Agente de transfer\u00eancia de correio &#8211; Seguran\u00e7a estrita de transporte<\/strong> (<strong><strong>MTA-STS<\/strong><\/strong>)<\/h2>\n\n\n\n<p>Consulte <a href=\"https:\/\/blog.mailfence.com\/pt\/mailfence-continua-melhorando-seguranca-para-seus-usuarios\/\">este post do blog<\/a> para saber mais sobre : defesa contra spoofing, o suporte do Mailfence ao DANE e ao MTA-STS.<\/p>\n\n\n\n<p>Voc\u00ea pode definir o MTA-STS para seu nome de dom\u00ednio (a pol\u00edtica do Mailfence MTA-STS pode ser encontrada <a href=\"https:\/\/mta-sts.mailfence.com\/.well-known\/mta-sts.txt\">aqui<\/a>). Se voc\u00ea n\u00e3o tiver uma hospedagem dispon\u00edvel para o seu dom\u00ednio, poder\u00e1 usar uma <a href=\"https:\/\/emailsecurity.blog\/hosting-your-mta-sts-policy-using-github-pages\">p\u00e1gina do Github<\/a>. <\/p>\n","protected":false},"excerpt":{"rendered":"<p>Para criar uma defesa contra spoofing, voc\u00ea n\u00e3o precisar\u00e1 fazer nenhuma modifica\u00e7\u00e3o se estiver usando apenas endere\u00e7os baseados no nome de dom\u00ednio mailfence.com. No entanto, se voc\u00ea tiver adicionado seu pr\u00f3prio nome de dom\u00ednio, dever\u00e1 configurar as seguintes entradas de DNS para evitar falsifica\u00e7\u00e3o de e-mail e garantir a capacidade&#8230;<\/p>\n","protected":false},"author":1,"comment_status":"closed","ping_status":"closed","template":"","format":"standard","meta":{"footnotes":""},"ht-kb-category":[1200],"ht-kb-tag":[],"class_list":["post-8774","ht_kb","type-ht_kb","status-publish","format-standard","hentry","ht_kb_category-dominio-personalizado-pt"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.6 (Yoast SEO v27.6) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Defesa contra spoofing: Como configurar para o seu dom\u00ednio? - Mailfence Support<\/title>\n<meta name=\"description\" content=\"Configure a defesa contra spoofing adicionando registros SPF, DKIM e DMARC para evitar a falsifica\u00e7\u00e3o de e-mails e garantir suas entregas\" \/>\n<meta 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