{"id":64470,"date":"2018-01-08T17:47:12","date_gmt":"2018-01-08T16:47:12","guid":{"rendered":"https:\/\/blog.mailfence.com\/spoofing-como-proteja-se\/"},"modified":"2025-09-16T16:09:33","modified_gmt":"2025-09-16T14:09:33","slug":"spoofing-como-proteja-se","status":"publish","type":"post","link":"https:\/\/blog.mailfence.com\/pt\/spoofing-como-proteja-se\/","title":{"rendered":"Spoofing como proteja-se con SPF, DKIM e DMARC"},"content":{"rendered":"\n<p>Dada a natureza aberta e descentralizada do <a href=\"https:\/\/pt.wikipedia.org\/wiki\/Simple_Mail_Transfer_Protocol\">protocolo SMTP<\/a>, o spoofing \u00e9 um problema bastante comum. Todo servidor de e-mail conectado \u00e0 Internet pode enviar um e-mail usando seu endere\u00e7o de e-mail e, assim, falsificar sua identidade.Se estiver usando um <a href=\"https:\/\/blog.mailfence.com\/pt\/proprio-nome-dominio\/\">dom\u00ednio personalizado com o Mailfence<\/a>, recomendamos implantar t\u00e9cnicas de defesa, como SPF, DKIM e DMARC, contra falsifica\u00e7\u00e3o eletr\u00f4nica.<\/p>\n\n\n\t\t<div data-elementor-type=\"section\" data-elementor-id=\"100849\" class=\"elementor elementor-100849 elementor-100761\" data-elementor-post-type=\"elementor_library\">\n\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-124e1725 elementor-section-content-middle elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"124e1725\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-no\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-654e4e21\" data-id=\"654e4e21\" data-element_type=\"column\" data-e-type=\"column\" data-settings=\"{&quot;background_background&quot;:&quot;gradient&quot;}\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-3a3b1a23 elementor-widget elementor-widget-text-editor\" data-id=\"3a3b1a23\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><b>Mailfence &#8211; Sua su\u00edte de produtividade segura<\/b><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2c004279 elementor-widget elementor-widget-text-editor\" data-id=\"2c004279\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Recupere sua privacidade com<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-83e0dd6 elementor-icon-list--layout-inline elementor-align-center elementor-list-item-link-full_width elementor-widget elementor-widget-icon-list\" data-id=\"83e0dd6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"icon-list.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<ul class=\"elementor-icon-list-items elementor-inline-items\">\n\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item elementor-inline-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-envelope-open-text\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M176 216h160c8.84 0 16-7.16 16-16v-16c0-8.84-7.16-16-16-16H176c-8.84 0-16 7.16-16 16v16c0 8.84 7.16 16 16 16zm-16 80c0 8.84 7.16 16 16 16h160c8.84 0 16-7.16 16-16v-16c0-8.84-7.16-16-16-16H176c-8.84 0-16 7.16-16 16v16zm96 121.13c-16.42 0-32.84-5.06-46.86-15.19L0 250.86V464c0 26.51 21.49 48 48 48h416c26.51 0 48-21.49 48-48V250.86L302.86 401.94c-14.02 10.12-30.44 15.19-46.86 15.19zm237.61-254.18c-8.85-6.94-17.24-13.47-29.61-22.81V96c0-26.51-21.49-48-48-48h-77.55c-3.04-2.2-5.87-4.26-9.04-6.56C312.6 29.17 279.2-.35 256 0c-23.2-.35-56.59 29.17-73.41 41.44-3.17 2.3-6 4.36-9.04 6.56H96c-26.51 0-48 21.49-48 48v44.14c-12.37 9.33-20.76 15.87-29.61 22.81A47.995 47.995 0 0 0 0 200.72v10.65l96 69.35V96h320v184.72l96-69.35v-10.65c0-14.74-6.78-28.67-18.39-37.77z\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\"><b>Mensagens<\/b><\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item elementor-inline-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-far-calendar-alt\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M148 288h-40c-6.6 0-12-5.4-12-12v-40c0-6.6 5.4-12 12-12h40c6.6 0 12 5.4 12 12v40c0 6.6-5.4 12-12 12zm108-12v-40c0-6.6-5.4-12-12-12h-40c-6.6 0-12 5.4-12 12v40c0 6.6 5.4 12 12 12h40c6.6 0 12-5.4 12-12zm96 0v-40c0-6.6-5.4-12-12-12h-40c-6.6 0-12 5.4-12 12v40c0 6.6 5.4 12 12 12h40c6.6 0 12-5.4 12-12zm-96 96v-40c0-6.6-5.4-12-12-12h-40c-6.6 0-12 5.4-12 12v40c0 6.6 5.4 12 12 12h40c6.6 0 12-5.4 12-12zm-96 0v-40c0-6.6-5.4-12-12-12h-40c-6.6 0-12 5.4-12 12v40c0 6.6 5.4 12 12 12h40c6.6 0 12-5.4 12-12zm192 0v-40c0-6.6-5.4-12-12-12h-40c-6.6 0-12 5.4-12 12v40c0 6.6 5.4 12 12 12h40c6.6 0 12-5.4 12-12zm96-260v352c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V112c0-26.5 21.5-48 48-48h48V12c0-6.6 5.4-12 12-12h40c6.6 0 12 5.4 12 12v52h128V12c0-6.6 5.4-12 12-12h40c6.6 0 12 5.4 12 12v52h48c26.5 0 48 21.5 48 48zm-48 346V160H48v298c0 3.3 2.7 6 6 6h340c3.3 0 6-2.7 6-6z\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\"><b>Calend\u00e1rios<\/b><\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item elementor-inline-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-far-folder\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M464 128H272l-54.63-54.63c-6-6-14.14-9.37-22.63-9.37H48C21.49 64 0 85.49 0 112v288c0 26.51 21.49 48 48 48h416c26.51 0 48-21.49 48-48V176c0-26.51-21.49-48-48-48zm0 272H48V112h140.12l54.63 54.63c6 6 14.14 9.37 22.63 9.37H464v224z\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\"><b>Documentos<\/b><\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item elementor-inline-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-users-cog\" viewBox=\"0 0 640 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M610.5 341.3c2.6-14.1 2.6-28.5 0-42.6l25.8-14.9c3-1.7 4.3-5.2 3.3-8.5-6.7-21.6-18.2-41.2-33.2-57.4-2.3-2.5-6-3.1-9-1.4l-25.8 14.9c-10.9-9.3-23.4-16.5-36.9-21.3v-29.8c0-3.4-2.4-6.4-5.7-7.1-22.3-5-45-4.8-66.2 0-3.3.7-5.7 3.7-5.7 7.1v29.8c-13.5 4.8-26 12-36.9 21.3l-25.8-14.9c-2.9-1.7-6.7-1.1-9 1.4-15 16.2-26.5 35.8-33.2 57.4-1 3.3.4 6.8 3.3 8.5l25.8 14.9c-2.6 14.1-2.6 28.5 0 42.6l-25.8 14.9c-3 1.7-4.3 5.2-3.3 8.5 6.7 21.6 18.2 41.1 33.2 57.4 2.3 2.5 6 3.1 9 1.4l25.8-14.9c10.9 9.3 23.4 16.5 36.9 21.3v29.8c0 3.4 2.4 6.4 5.7 7.1 22.3 5 45 4.8 66.2 0 3.3-.7 5.7-3.7 5.7-7.1v-29.8c13.5-4.8 26-12 36.9-21.3l25.8 14.9c2.9 1.7 6.7 1.1 9-1.4 15-16.2 26.5-35.8 33.2-57.4 1-3.3-.4-6.8-3.3-8.5l-25.8-14.9zM496 368.5c-26.8 0-48.5-21.8-48.5-48.5s21.8-48.5 48.5-48.5 48.5 21.8 48.5 48.5-21.7 48.5-48.5 48.5zM96 224c35.3 0 64-28.7 64-64s-28.7-64-64-64-64 28.7-64 64 28.7 64 64 64zm224 32c1.9 0 3.7-.5 5.6-.6 8.3-21.7 20.5-42.1 36.3-59.2 7.4-8 17.9-12.6 28.9-12.6 6.9 0 13.7 1.8 19.6 5.3l7.9 4.6c.8-.5 1.6-.9 2.4-1.4 7-14.6 11.2-30.8 11.2-48 0-61.9-50.1-112-112-112S208 82.1 208 144c0 61.9 50.1 112 112 112zm105.2 194.5c-2.3-1.2-4.6-2.6-6.8-3.9-8.2 4.8-15.3 9.8-27.5 9.8-10.9 0-21.4-4.6-28.9-12.6-18.3-19.8-32.3-43.9-40.2-69.6-10.7-34.5 24.9-49.7 25.8-50.3-.1-2.6-.1-5.2 0-7.8l-7.9-4.6c-3.8-2.2-7-5-9.8-8.1-3.3.2-6.5.6-9.8.6-24.6 0-47.6-6-68.5-16h-8.3C179.6 288 128 339.6 128 403.2V432c0 26.5 21.5 48 48 48h255.4c-3.7-6-6.2-12.8-6.2-20.3v-9.2zM173.1 274.6C161.5 263.1 145.6 256 128 256H64c-35.3 0-64 28.7-64 64v32c0 17.7 14.3 32 32 32h65.9c6.3-47.4 34.9-87.3 75.2-109.4z\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\"><b>Grupos<\/b><\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-436babb elementor-align-center elementor-widget elementor-widget-button\" data-id=\"436babb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/mailfence.com\/pt\/#pricing\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Crie sua conta gratuita no Mailfence<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-sender-policy-framework-spf\"><strong>Sender Policy Framework (SPF)<\/strong><\/h2>\n\n\n\n<p>Em sua conta do Mailfence, acesse <strong>Configura\u00e7\u00f5es da conta -&gt; Mensagens -&gt; Dom\u00ednios de e-mail -&gt; Clique em sua lista de dom\u00ednios personalizados: SPF<\/strong><\/p>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img decoding=\"async\" src=\"https:\/\/blog.mailfence.com\/wp-content\/uploads\/2018\/01\/domain_3.png\" alt=\"Spoofing como proteja-se\" style=\"width:628px;height:auto\"\/><\/figure>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>Depois que o respectivo registro DNS tiver sido inclu\u00eddo com sucesso, clique em <strong>Validar<\/strong> &#8220;.<\/p>\n\n\n\n<p>O registro do <a href=\"https:\/\/pt.wikipedia.org\/wiki\/Sender_Policy_Framework\">Sender Policy Framework<\/a> (SPF) informa ao destinat\u00e1rio quais hosts ou endere\u00e7os IP podem enviar emails para seu dom\u00ednio. Voc\u00ea precisar\u00e1 adicionar registros DNS do tipo &#8216;TXT&#8217; com o nome &#8216;@&#8217; (se o campo estiver presente) por meio de seu provedor de dom\u00ednio, registrador de dom\u00ednio ou provedor de DNS. Recomendamos consultar a documenta\u00e7\u00e3o de ajuda do seu provedor para obter informa\u00e7\u00f5es espec\u00edficas adicionando registros TXT.<\/p>\n\n\n\n<p>No seu registro SPF, voc\u00ea pode &#8220;incluir&#8221; o seguinte dom\u00ednio _spf.mailfence.com com os seguintes valores:<\/p>\n\n\n\n<p>Se os emails s\u00f3 forem enviados usando os servidores mailfence.com (webmail, SMTP autenticado, envio):<\/p>\n\n\n\n<div>&nbsp;<strong><span style=\"font-family: Consolas, Monaco, monospace;\">v=spf1 include:_spf.mailfence.com -all<\/span><\/strong><\/div>\n\n\n\n<div>&nbsp;<\/div>\n\n\n\n<div>Se os emails tamb\u00e9m puderem ser enviados de outros servidores, use:<\/div>\n\n\n\n<div>&nbsp;<\/div>\n\n\n\n<div><strong><span style=\"font-family: Consolas, Monaco, monospace;\">v=spf1 include:_spf.mailfence.com ~all<\/span><\/strong><\/div>\n\n\n\n<div>Ele ajudar\u00e1 a proteger seu dom\u00ednio contra hackers \/ spammers que enviam e-mails com cabe\u00e7alhos usurpados e adicionam mais legitimidade aos e-mails que voc\u00ea envia.<\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-domain-keys-identified-mail-dkim\"><strong>Domain Keys Identified Mail (DKIM)<\/strong><\/h2>\n\n\n\n<p>Em sua conta do Mailfence, v\u00e1 para <strong>Configura\u00e7\u00f5es -&gt; Mensagens -&gt; Dom\u00ednios de e-mail -&gt; Clique em sua lista de dom\u00ednios personalizados: DKIM<\/strong>.<\/p>\n\n\n\n<p>Siga as instru\u00e7\u00f5es mencionadas.<\/p>\n\n\n\n<p>Depois que o respectivo registro DNS tiver sido inclu\u00eddo com sucesso, clique em <strong>Validar<\/strong>.<\/p>\n\n\n\n<p>O DKIM (<a href=\"https:\/\/fr.wikipedia.org\/wiki\/DomainKeys_Identified_Mail\">Domain Keys Identified Mail<\/a>) \u00e9 um padr\u00e3o de autentica\u00e7\u00e3o de e-mail que criptograficamente verifica se um e-mail \u00e9 enviado por servidores autorizados e n\u00e3o foi modificado durante o envio. Se voc\u00ea quiser que habilitemos a assinatura DKIM (recomendada) para os e-mails enviados pelos nossos servidores com um endere\u00e7o de remetente contendo seu dom\u00ednio, envie-nos um e-mail para nos solicitar.<\/p>\n\n\n\n<p>Por favor inclua seu dom\u00ednio e o nome de login de sua conta nesta notifica\u00e7\u00e3o para que possamos inform\u00e1-lo assim que o ativarmos em seu dom\u00ednio.<\/p>\n\n\n\n<p>Nota: Todos os e-mails est\u00e3o atualmente assinados com a chave de dom\u00ednio DKIM do Mailfence.com, portanto, voc\u00ea n\u00e3o precisar\u00e1 instalar nada na sua zona DNS. Isso elimina a necessidade de gerar uma chave DKIM, gerenciar, girar e descartar com seguran\u00e7a as chaves privadas DKIM que est\u00e3o comprometidas ou desatualizadas ou desatualizadas com seus usu\u00e1rios.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-domain-based-message-authentication-reporting-and-conformance-dmarc\"><strong>Domain-based Message Authentication, Reporting and Conformance (DMARC)<\/strong><\/h2>\n\n\n\n<p>Em sua conta do Mailfence, acesse <strong>Configura\u00e7\u00f5es da conta -&gt; Mensagens -&gt; Dom\u00ednios de e-mail -&gt; Clique em sua lista de dom\u00ednios personalizados: DMARC<\/strong><\/p>\n\n\n\n<p>Siga as instru\u00e7\u00f5es mencionadas.<\/p>\n\n\n\n<p>Depois de se referir a SPF e DKIM, uma pergunta que um servidor de recep\u00e7\u00e3o ao receber um e-mail que n\u00e3o conseguiu passar estes postos de controle. Este \u00e9 o lugar onde a mensagem de autentica\u00e7\u00e3o baseado no (<a href=\"https:\/\/pt.wikipedia.org\/wiki\/DMARC#DKIM_%28DomainKeys_Identified_Mail%29\">Mensagem baseada em Dom\u00ednio de autentica\u00e7\u00e3o, Relat\u00f3rios e Conformidade, ou DMARC<\/a>) campo, elabora\u00e7\u00e3o de relat\u00f3rios e conformidade vem em permitir que o propriet\u00e1rio do dom\u00ednio para especificar o que deve acontecer com e-mails n\u00e3o conseguiu passar os controlos de seguran\u00e7a, bem como receber relat\u00f3rios \/ retornos.<\/p>\n\n\n\n<p>Registrador de dom\u00ednio, ou provedor de DNS, voc\u00ea precisar\u00e1 adicionar um registro DNS do tipo &#8216;TXT&#8217; com o nome &#8216;_dmarc&#8217; (que ser\u00e1 um registro TXT como _dmarc.seudominio.com; \/ domain \/ aceita\u00e7\u00e3o do provedor de DNS). Recomendamos consultar a documenta\u00e7\u00e3o de ajuda do seu provedor para obter informa\u00e7\u00f5es espec\u00edficas adicionando registros TXT.<\/p>\n\n\n\n<p>Nota: se voc\u00ea j\u00e1 tiver um registro TXT do DNS com o nome&#8221; _dmarc &#8220;para o seu dom\u00ednio, edite esse registro em vez de criar um novo. Isso \u00e9 importante para voc\u00ea n\u00e3o ter v\u00e1rios registros DMARC para um determinado dom\u00ednio.<\/p>\n\n\n\n<p class=\"has-text-align-left\"><strong>v=DMARC1; p=none; rua=reports@yourdomain.com;<\/strong><\/p>\n\n\n\n<p>O &#8220;p =&#8221; especifica a a\u00e7\u00e3o a ser tomada para e-mails n\u00e3o conseguiu passar DMARC e aqui, &#8220;none&#8221; significa na pr\u00e1tica n\u00e3o fazer nada, e siga a pol\u00edtica de acolhimento. As outras op\u00e7\u00f5es s\u00e3o quarentena e rejei\u00e7\u00e3o, no entanto, a afirma\u00e7\u00e3o acima \u00e9 o modo &#8220;\u00fanico relat\u00f3rio&#8221; (recomendado), e n\u00e3o tem efeito sobre a distribui\u00e7\u00e3o de e-mail. Se voc\u00ea planeja usar a quarentena ou rejei\u00e7\u00e3o, por isso certifique-se de <a href=\"https:\/\/pt.wikipedia.org\/wiki\/DMARC#DKIM_%28DomainKeys_Identified_Mail%29\">compreender os riscos<\/a> que surgem para a distribui\u00e7\u00e3o de seu e-mail.<\/p>\n\n\n\n<p>O endere\u00e7o de e-mail que voc\u00ea precisa especificar em &#8220;rua = mailto:&#8221; \u00e9 onde voc\u00ea receber\u00e1 relat\u00f3rios DMARC de outros provedores de servi\u00e7os. Substitua este endere\u00e7o por um endere\u00e7o real que voc\u00ea possui. Pode ser qualquer endere\u00e7o de e-mail em que voc\u00ea gostaria de receber relat\u00f3rios DMARC para seu dom\u00ednio personalizado, por exemplo:<br><strong><span style=\"font-size: 10.0pt; font-family: 'Arial',sans-serif; color: black;\">v=DMARC1; p=none; rua=mailto:email@foo.bar;<\/span><\/strong><\/p>\n\n\n\n<p>Depois que o respectivo registro DNS tiver sido inclu\u00eddo com sucesso, clique em <strong>Validar<\/strong><\/p>\n\n\n\n<p>Posteriormente, se voc\u00ea gostaria de parar de receber relat\u00f3rios DMARC para seu dom\u00ednio personalizado, basta excluir a entrada DMARC dos seus registros DNS<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-nota-de-anexo-relativa-ao-spf-ao-dkim-e-ao-dmarc\">Nota de anexo relativa ao SPF, ao DKIM e ao DMARC:<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Quando voc\u00ea edita um registro DNS existente, pode levar algum tempo at\u00e9 que as altera\u00e7\u00f5es sejam levadas em considera\u00e7\u00e3o (de algumas horas a alguns dias, dependendo do valor TTL dos registros anteriores).<\/li>\n\n\n\n<li>Existem v\u00e1rias ferramentas externas que voc\u00ea pode usar para testar ainda mais o SPF (por exemplo, http:\/\/www.kitterman.com\/spf\/validate.html), o DKIM (por exemplo, http:\/\/dkimvalidator.com) ou ambos (por exemplo, https:\/\/www.mail-tester.com).<\/li>\n<\/ul>\n\n\n\n<div class=\"tlid-input input\">\n<div class=\"source-wrap\">\n<div class=\"input-full-height-wrapper tlid-input-full-height-wrapper\">\n<div class=\"source-input\">&nbsp;<\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-a-defesa-final-contra-a-falsificacao-assinaturas-digitais\"><span class=\"tlid-translation translation\"><span title=\"\">A defesa final contra a falsifica\u00e7\u00e3o: assinaturas digitais<\/span><\/span><\/h2>\n\n\n\n<p><span class=\"tlid-translation translation\"><span class=\"\" title=\"\">Al\u00e9m de toda a prote\u00e7\u00e3o contra roubo e falsifica\u00e7\u00e3o de identidade usando <a href=\"https:\/\/blog.mailfence.com\/pt\/mailfence-implementa-spf-sender-policy-framework\/\">SPF<\/a>, DKIM e DMARC, o Mailfence oferece a capacidade de assinar digitalmente seus emails com assinaturas OpenPGP.<\/span> <span class=\"\" title=\"\">Em nossa opini\u00e3o, esta \u00e9 a defesa final contra falsifica\u00e7\u00e3o e falsifica\u00e7\u00e3o.<\/span> <span class=\"\" title=\"\">Voc\u00ea pode escolher um par de chaves OpenPGP de sua escolha e ter controle total sobre este par de chaves.<\/span> <span class=\"\" title=\"\">Voc\u00ea tamb\u00e9m pode decidir a qualquer momento quais e-mails deseja assinar ou n\u00e3o &#8211; ou pode assinar todos os seus e-mails enviados por padr\u00e3o.<\/span><\/span><\/p>\n\n\n\n<p><span class=\"\" title=\"\">Voc\u00ea tem d\u00favidas sobre SPF, DKIM e DMARC?<\/span> <span class=\"\" title=\"\">N\u00e3o hesite em entrar em contato com nosso departamento de suporte.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Dada a natureza aberta e descentralizada do protocolo SMTP, o spoofing \u00e9 um problema bastante comum. Todo servidor de e-mail conectado \u00e0 Internet pode enviar um e-mail usando seu endere\u00e7o de e-mail e, assim, falsificar sua identidade.Se estiver usando um dom\u00ednio personalizado com o Mailfence, recomendamos implantar t\u00e9cnicas de defesa, como SPF, DKIM e DMARC, [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":85875,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1379],"tags":[],"class_list":["post-64470","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seguranca-de-email"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.2 (Yoast SEO v27.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Spoofing: como proteja-se com SPF, DKIM e DMARC<\/title>\n<meta name=\"description\" content=\"Dada a natureza aberta e descentralizada do protocolo SMTP, o spoofing \u00e9 um problema bastante comum. 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