{"id":64428,"date":"2018-11-22T23:23:11","date_gmt":"2018-11-22T22:23:11","guid":{"rendered":"https:\/\/blog.mailfence.com\/cabecalho-e-mail\/"},"modified":"2025-09-16T16:09:00","modified_gmt":"2025-09-16T14:09:00","slug":"cabecalho-e-mail","status":"publish","type":"post","link":"https:\/\/blog.mailfence.com\/pt\/cabecalho-e-mail\/","title":{"rendered":"Como ler e analisar os campos de cabe\u00e7alho e informa\u00e7\u00f5es sobre SPF, DKIM, SpamAssassin"},"content":{"rendered":"\n<p>Esta postagem de blog explicar\u00e1 como ler e entender o &#8220;cabe\u00e7alho de e-mail&#8221; que acompanha todos os e-mails. Ele cont\u00e9m detalhes sobre o remetente, a rota tomada e o destinat\u00e1rio. Use essas informa\u00e7\u00f5es para evitar e-mails indesejados ou para reconhecer um golpe ou malware entregue por e-mail.<\/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-como-acessar-o-cabecalho-da-mensagem\">Como acessar o cabe\u00e7alho da mensagem<\/h2>\n\n\n\n<p>Na interface da Web do <a href=\"https:\/\/mailfence.com\">Mailfence <\/a>-&gt; Simplesmente v\u00e1 para a sua caixa de correio -&gt; Clique com o bot\u00e3o direito do mouse no e-mail -&gt; Ver c\u00f3digo-fonte<br><\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"201\" height=\"295\" src=\"https:\/\/blog.mailfence.com\/wp-content\/uploads\/2018\/09\/View-source.png\" alt=\"Email Header\" class=\"wp-image-7034\" style=\"object-fit:contain;width:200px;height:299px\" srcset=\"https:\/\/blog.mailfence.com\/wp-content\/uploads\/2018\/09\/View-source.png 201w, https:\/\/blog.mailfence.com\/wp-content\/uploads\/2018\/09\/View-source-109x160.png 109w, https:\/\/blog.mailfence.com\/wp-content\/uploads\/2018\/09\/View-source-167x245.png 167w\" sizes=\"auto, (max-width: 201px) 100vw, 201px\" \/><\/figure>\n\n\n\n<p><br>A maioria dos clientes de e-mail permite acesso ao cabe\u00e7alho da mensagem. A lista a seguir cont\u00e9m alguns clientes populares de e-mail e de webmail.<br>Por favor, consulte o manual do seu cliente de e-mail se o seu cliente de e-mail n\u00e3o estiver inclu\u00eddo nesta lista.<\/p>\n\n\n\n<p><strong>Visualizar o cabe\u00e7alho do e-mail no Gmail do Gmail:<\/strong><\/p>\n\n\n\n<p>Entre na sua conta atrav\u00e9s da interface web e abra a mensagem (clique nela). Clique na &#8220;seta para baixo&#8221; no canto superior direito da mensagem e selecione &#8220;Mostrar original&#8221;.<\/p>\n\n\n\n<p><strong>Veja o cabe\u00e7alho do e-mail no Yahoo Mail Webmail:<\/strong><\/p>\n\n\n\n<p>Entre na sua conta atrav\u00e9s da interface web e abra a mensagem (clique nela). Clique em &#8220;A\u00e7\u00f5es&#8221; e selecione &#8220;Visualizar cabe\u00e7alho completo&#8221;.<\/p>\n\n\n\n<p><strong>Veja o cabe\u00e7alho do e-mail no Hotmail Webmail:<\/strong><\/p>\n\n\n\n<p>Entre na sua conta atrav\u00e9s da interface web e v\u00e1 para a lista de mensagens. Clique com o bot\u00e3o direito na mensagem e selecione &#8220;Visualizar a origem da mensagem&#8221;.<\/p>\n\n\n\n<p><strong>Veja os cabe\u00e7alhos da Internet no MS Outlook:<\/strong><\/p>\n\n\n\n<p>Abra a mensagem no MS Outlook. Agora v\u00e1 para &#8220;Visualizar&#8221; e selecione &#8220;Op\u00e7\u00f5es de mensagem&#8221; ou &#8220;Arquivo&#8221; -&gt; &#8220;Informa\u00e7\u00f5es&#8221; -&gt; &#8220;Propriedades&#8221;. Marque &#8220;Cabe\u00e7alhos da Internet&#8221;.<\/p>\n\n\n\n<p><b>Veja o cabe\u00e7alho do e-mail&nbsp;no Thunderbird:<\/b><\/p>\n\n\n\n<p>Abra a mensagem, clique em &#8220;Visualizar&#8221; e selecione &#8220;Origem da mensagem&#8221;.<\/p>\n\n\n\n<p><b>Veja o cabe\u00e7alho do e-mail&nbsp;no MS Windows Mail (e no MS Outlook Express):<\/b><\/p>\n\n\n\n<p>Selecione a mensagem na lista, clique com o bot\u00e3o direito nela e selecione &#8220;Propriedades&#8221; e v\u00e1 para &#8220;Detalhes&#8221;.<\/p>\n\n\n\n<p>Nota: <em>as instru\u00e7\u00f5es mencionadas acima podem variar dependendo da vers\u00e3o do cliente de email que voc\u00ea est\u00e1 usando.<\/em><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-como-usar-campos-de-cabecalho-de-e-mail\">Como usar campos de cabe\u00e7alho de e-mail<\/h2>\n\n\n\n<p>Usaremos o seguinte cabe\u00e7alho de mensagem de amostra. A fonte em azul descrever\u00e1 o que cada um dos campos comuns em um cabe\u00e7alho de e-mail representa e como essas informa\u00e7\u00f5es podem ser usadas de maneira \u00fatil.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">Campos padr\u00e3o de cabe\u00e7alho de e-mail<\/pre>\n\n\n\n<pre class=\"wp-block-preformatted\">Recebido: de sender_mail_server ([bbb.bbb.bbb.bbb])\npor recipient_mail_exchanger (envelope de &lt;example@gmail.com&gt;) com ESMTPS<\/pre>\n\n\n\n<p><span style=\"color: #3366ff;\">A mensagem foi recebida pelo recipient_mail_exchanger do servidor sender_mail_server com um endere\u00e7o IP bbb.bbb.bbb.bbb em STARTTLS (&#8220;S&#8221; na tag ESMTP significa secure).<\/span><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">for &lt;example@mailfence.com&gt; ; Wed, 7 Sep 2018 12:35:32 +0200 (CEST)\nReturn-Path: example@gmail.com<\/pre>\n\n\n\n<p><span style=\"color: #3366ff;\">LO servidor de e-mail envia um e-mail de notifica\u00e7\u00e3o para o endere\u00e7o especificado aqui, quando a mensagem \u00e9 retornada ao remetente ou n\u00e3o pode ser entregue. Esse endere\u00e7o \u00e9 comumente chamado de &#8220;endere\u00e7o de resposta&#8221; e pode ser diferente do endere\u00e7o de e-mail do remetente.<\/span><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">Received: by xyz.google.com with SMTP id abc.xyz\nfor &lt;example@mailfence.com&gt;; Wed, 07 Sep 2018 03:35:32 -0700 (PDT)<\/pre>\n\n\n\n<pre class=\"wp-block-preformatted\"><strong>... \n<\/strong><\/pre>\n\n\n\n<pre class=\"wp-block-preformatted\"><span style=\"color: #3366ff;\">A mensagem passa por todos esses servidores de email (ou MTAs) (geralmente de 1 a 3) de sender_mail_server para recipient_mail_exchanger.<\/span><\/pre>\n\n\n\n<pre class=\"wp-block-preformatted\">Received: from \u2018Sender_display_name\u2019 ([<em>aaa.aaa.aaa.aaa<\/em>])<\/pre>\n\n\n\n<p><span style=\"color: #3366ff;\">A mensagem foi enviada do dispositivo do remetente com o endere\u00e7o IP aaa.aaa.aaa.aaa. Voc\u00ea tamb\u00e9m encontrar\u00e1 no campo de cabe\u00e7alho X-Originating-IP. Esse endere\u00e7o IP \u00e9 suprimido principalmente por clientes de e-mail amig\u00e1veis \u00e0 privacidade, pois pode revelar detalhes sobre a localiza\u00e7\u00e3o do remetente.<\/span><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">by sender_server_domain_name with ESMTPSA id abc_xyz_123\nfor &lt;example@mailfence.com&gt;\n(version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128\/128);\nWed, 07 Sep 2018 03:35:31 -0700 (PDT)<\/pre>\n\n\n\n<p><span style=\"color: #3366ff;\">Depois de receber uma mensagem do dispositivo do remetente com o endere\u00e7o IP &#8220;aaa.aaa.aaa.aaa&#8221;, o servidor de email sender_server_domain_name transfere a mensagem para STARTTLS (na tag ESMTP, &#8220;S&#8221; significa seguro e &#8220;A&#8221; As informa\u00e7\u00f5es tamb\u00e9m incluem a vers\u00e3o TLS e o conjunto de criptografia usado pelo protocolo STARTTLS.<em><br><\/em><\/span><span style=\"color: #ff0000;\">Alguns podem tentar simular as informa\u00e7\u00f5es de roteamento, e seu servidor de e-mail deve avis\u00e1-lo de que algo estava errado com a transfer\u00eancia de sender_server_domain_name para recipient_mail_exchanger.<\/span><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">From: example@gmail.com<\/pre>\n\n\n\n<p><span style=\"color: #3366ff;\">Endere\u00e7o do remetente da mensagem.<\/span><br><span style=\"color: #ff0000;\">Este poderia ser facilmente imitado, ou poderia aparecer no formul\u00e1rio examp1e@gmail.com ou example@gmai1.com (&#8216;1&#8217; e &#8216;sendo muito similar).<\/span><\/p>\n\n\n\n<p>Confira nossos posts sobre <a href=\"https:\/\/blog.mailfence.com\/pt\/o-que-e-phishing\/\">phishing<\/a> e <a href=\"https:\/\/blog.mailfence.com\/pt\/o-que-e-engenharia-social\/\">engenharia social<\/a> para mais detalhes.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">To: example@mailfence.com<\/pre>\n\n\n\n<p><span style=\"color: #3366ff;\">Endere\u00e7o do destinat\u00e1rio da mensagem.<\/span><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">Subject: Leaving Gmail!<\/pre>\n\n\n\n<p><span style=\"color: #3366ff;\">Objeto da mensagem<\/span><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">Date: Wed, 7 Sep 2018 12:35:29 +0200\nMessage-ID: 000601d30978hc36040$819a20c0$@gmail.com<\/pre>\n\n\n\n<p><span style=\"color: #3366ff;\">Data e ID da mensagem.<\/span><\/p>\n\n\n\n<p><span style=\"color: #ff0000;\">Se a data mencionada aqui for diferente da data mencionada no \u00faltimo cabe\u00e7alho recebido (a parte superior), isso pode indicar um problema de entrega de mensagens OU um <a href=\"https:\/\/pt.wikipedia.org\/wiki\/Ataque_man-in-the-middle\">ataque MITM<\/a>. \u00c9 aconselh\u00e1vel ter cautela em tais casos.<\/span><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">MIME-Version: 1.0\nContent-Type: multipart\/alternative;<\/pre>\n\n\n\n<p><span style=\"color: #3366ff;\">Vers\u00e3o e tipo <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Multipurpose_Internet_Mail_Extensions\">MIME<\/a><\/span><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">X-Mailer: Microsoft Outlook 16.0<\/pre>\n\n\n\n<p><span style=\"color: #3366ff;\">O cliente de e-mail (ou MUA) usado para enviar esta mensagem. Esta linha \u00e9 mais frequentemente exclu\u00edda por clientes de e-mail com consci\u00eancia de privacidade.<\/span><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">Content-Type: text\/plain;\ncharset=\"UTF-8\"\nContent-Transfer-Encoding: quoted-printable<\/pre>\n\n\n\n<p><span style=\"color: #3366ff;\">Esta \u00e9 uma mensagem multiparte <a href=\"https:\/\/pt.wikipedia.org\/wiki\/MIME\">no formato MIME (Multipurpose Internet Mail Extensions)<\/a>. Esse \u00e9 um <a href=\"https:\/\/en.wikipedia.org\/wiki\/Internet_Standard\">padr\u00e3o da Internet<\/a> que amplia o formato das mensagens de e-mail para oferecer suporte a rich text, arquivos e outros conte\u00fados ativos.<\/span><\/p>\n\n\n\n<p><span style=\"color: #3366ff;\">&nbsp;<em>&lt;&lt; Corpo da mensagem &gt;&gt; (corpo da mensagem)<\/em><\/span><\/p>\n\n\n\n<p><strong>Ol\u00e1,<\/strong><\/p>\n\n\n\n<p><strong>Chega de viola\u00e7\u00f5es de privacidade e pr\u00e1ticas comerciais duvidosas pelo Gmail!<\/strong><br><strong>Este \u00e9 meu \u00faltimo e-mail do Gmail, pois finalmente decidi entrar para o Mailfence!<\/strong><\/p>\n\n\n\n<p><strong>Sauda\u00e7\u00f5es,<\/strong><br><strong>Usu\u00e1rio consciente da privacidade!<\/strong><\/p>\n\n\n\n<p><strong>&#8212;&#8212; = _ NextPart_000_0007_01D44514.EEC24AC0 &#8230;&#8212;&#8212; = _ NextPart_000_0007_01D44514.EEC24AC0&#8211;<\/strong><\/p>\n\n\n\n<p><span style=\"color: #3366ff;\"><em>&lt;&lt; corpo da mensagem &gt;&gt;<\/em><\/span><\/p>\n\n\n\n<p><span style=\"color: #ff0000;\">O corpo da mensagem pode conter links prejudiciais, como &#8220;example.com&#8221;, que podem conter um link de hipertexto para &#8220;linkmalveillant.com&#8221;<br>Confira nossos posts sobre <a href=\"https:\/\/blog.mailfence.com\/pt\/o-que-e-phishing\/\">phishing<\/a> e <a href=\"https:\/\/blog.mailfence.com\/pt\/o-que-e-engenharia-social\/\">engenharia social<\/a> para mais detalhes.<\/span><\/p>\n\n\n\n<p>Estrutura de Pol\u00edtica de Remetente (SPF)<br>O SPF \u00e9 uma estrutura para evitar a falsifica\u00e7\u00e3o do endere\u00e7o do remetente. Ele \u00e9 usado para descrever qual servidor de email tem permiss\u00e3o para enviar mensagens para um determinado dom\u00ednio (remetente). Assim, o SPF permite evitar os endere\u00e7os de e-mail de um remetente simulado. O resultado (Recebido-SPF) pode ser neutro, passar (&#8216;passar&#8217;) ou falhar (&#8216;falhar&#8217;).<\/p>\n\n\n\n<p>Seguindo o exemplo da mensagem acima:<\/p>\n\n\n\n<p>Recebido-SPF: passe<br>O resultado da valida\u00e7\u00e3o \u00e9 &#8220;n\u00e3o&#8221; porque o endere\u00e7o IP do remetente_servidor_domain_nome tem permiss\u00e3o para enviar e-mails para o dom\u00ednio &#8220;gmail.com&#8221;.<\/p>\n\n\n\n<p>Se o resultado da valida\u00e7\u00e3o for &#8220;falha&#8221;, \u00e9 prov\u00e1vel que algu\u00e9m tenha tentado falsificar o endere\u00e7o de e-mail e \/ ou o conte\u00fado do remetente.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-sender-policy-framework-spf\">Sender Policy Framework (SPF)<\/h3>\n\n\n\n<p>O SPF \u00e9 uma estrutura para evitar a falsifica\u00e7\u00e3o do endere\u00e7o do remetente. Ele \u00e9 usado para descrever qual servidor de e-mail tem permiss\u00e3o para enviar mensagens para um determinado dom\u00ednio (remetente). Assim, o SPF permite evitar os endere\u00e7os de e-mail de um remetente simulado. O resultado (Recebido-SPF) pode ser neutro, passar (&#8216;passar&#8217;) ou falhar (&#8216;falhar&#8217;).<\/p>\n\n\n\n<p>Seguindo o exemplo da mensagem acima:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">Received-SPF: pass<\/pre>\n\n\n\n<p><span style=\"color: #3366ff;\">O resultado da valida\u00e7\u00e3o \u00e9 &#8220;n\u00e3o&#8221; porque o endere\u00e7o IP do remetente_servidor_domain_nome tem permiss\u00e3o para enviar e-mails para o dom\u00ednio &#8220;gmail.com&#8221;.<\/span><\/p>\n\n\n\n<p><span style=\"color: #ff0000;\">Se o resultado da valida\u00e7\u00e3o for &#8220;falha&#8221;, \u00e9 prov\u00e1vel que algu\u00e9m tenha tentado falsificar o endere\u00e7o de e-mail e \/ ou o conte\u00fado do remetente.<\/span><\/p>\n\n\n\n<p>O Mailfence suporta o <a href=\"https:\/\/blog.mailfence.com\/pt\/mailfence-implementa-spf-sender-policy-framework\/\">SPF<\/a> e tamb\u00e9m incentiva os usu\u00e1rios de <a href=\"https:\/\/blog.mailfence.com\/pt\/spoofing-como-proteja-se\/\">dom\u00ednios personalizados<\/a> a us\u00e1-lo.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-domain-keys-identified-mail-dkim\">Domain Keys Identified Mail (DKIM)<\/h3>\n\n\n\n<p>O DKIM \u00e9 um m\u00e9todo de associar um nome de dom\u00ednio a um e-mail, permitindo que uma organiza\u00e7\u00e3o verifique a assinatura (criptogr\u00e1fica) para garantir que a mensagem foi enviada pelo propriet\u00e1rio reivindicado e que n\u00e3o foi enviada. mudou durante o tr\u00e2nsito.<\/p>\n\n\n\n<p>A partir do exemplo da mensagem acima :<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">DKIM-Signature: v=1; a=rsa-sha256; c=relaxed\/relaxed;\n        d=gmail.com; s=20161025;\n        h=from:to:subject:date:message-id:mime-version:thread-index\n         :content-language;\n        bh=fZjxO4TdlsVYWA6YIXoMF8AS+FOsm2lV1tfhDvYZNQo=;\n        b=cMSUNWMGENp4jXuFTInBnZi6Sq2ZcjhBNA0ht8rSEt1SR8b0gGmiiZZ4l52lGSCum5\n         lRtmPPtt\/tgnqubiLBBW2fatlarhjo6qRp7FRE9IsE6XBIl6muTGS\/kUDwEm9NGXjQRp\n         nxmHp4\/JKDKrYHg8cKsm+yr3k17hNXHITIrb9VAh2CtEKpAxSYN3MsC4QplXdnLArQju\n         U3jAnJf0lLZwZcygBbZSY7ENEAtHSbHpt6LLeQKlzosYARoakAH3j8EaAAAu1TfyAYE4\n         +u7ENqUzddifO6Qty3E2I4Soq00SbOO+e64WIUZ0gxoARQqeuAN7H\/jaOkC4t5mhWmkb\n         aEFA==<\/pre>\n\n\n\n<p><span style=\"color: #3366ff;\">A mensagem cont\u00e9m uma assinatura<a href=\"http:\/\/www.dkim.org\/ietf-dkim.htm#dkimsig\"> DKIM<\/a> v\u00e1lida (formatada de acordo com o padr\u00e3o).<\/span><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">dkim=pass<\/pre>\n\n\n\n<p><span style=\"color: #3366ff;\">O resultado da valida\u00e7\u00e3o \u00e9 &#8216;pass&#8217;.<br><\/span><span style=\"color: #3366ff;\"><span style=\"color: #ff0000;\">Se o resultado da valida\u00e7\u00e3o for &#8216;falhar&#8217;, \u00e9 muito prov\u00e1vel que a mensagem tenha sido adulterada ou modificada durante o tr\u00e2nsito e \/ ou que a mensagem seja spam.<\/span><\/span><\/p>\n\n\n\n<p>O Mailfence suporta o <a href=\"https:\/\/fr.wikipedia.org\/wiki\/DomainKeys_Identified_Mail\">DKIM<\/a> para usu\u00e1rios regulares por padr\u00e3o. O Mailfence tamb\u00e9m incentiva <a href=\"https:\/\/blog.mailfence.com\/pt\/spoofing-como-proteja-se\/\">usu\u00e1rios de dom\u00ednio personalizados a us\u00e1-lo.<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-a-pontuacao-de-spam\">A pontua\u00e7\u00e3o de spam<\/h3>\n\n\n\n<p>programas de detec\u00e7\u00e3o de spam comumente usado (por exemplo <a href=\"https:\/\/en.wikipedia.org\/wiki\/Apache_SpamAssassin\">SpamAssassin<\/a> &#8211; Ingl\u00eas link) instalado em servidores de correio apresentar um relat\u00f3rio detalhado para cada mensagem. Eles fazem isso adicionando linhas e um relat\u00f3rio no cabe\u00e7alho do e-mail.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">X-Spam-Flag: NO<\/pre>\n\n\n\n<p><span style=\"color: #3366ff;\">Resultado da detec\u00e7\u00e3o de spam.<\/span><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">X-Spam-Status: No hits=-1.2 required=4.7<\/pre>\n\n\n\n<p><span style=\"color: #3366ff;\">Resultado da detec\u00e7\u00e3o de spam com a pontua\u00e7\u00e3o. Uma pontua\u00e7\u00e3o abaixo de 5 indica (na maioria dos sistemas) n\u00e3o spam, entre 5 e 15, provavelmente, spam, e mais de 15 definitivamente spam.<\/span><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">symbols=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FROM,HTML_MESSAGE,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,RDNS_NONE,SPF_PASS device=ccc.ccc.ccc.ccc<\/pre>\n\n\n\n<p><span style=\"color: #3366ff;\">Os programas de detec\u00e7\u00e3o de spam n\u00e3o s\u00f3 verificar o remetente da mensagem, mas tamb\u00e9m o formato eo conte\u00fado da mensagem para gerar a sua pontua\u00e7\u00e3o final de spam. Por exemplo, estrutura de mensagem, SPF + DKIM, <a href=\"https:\/\/fr.wikipedia.org\/wiki\/DNS_Black_Listing\">DNSBL<\/a>, regras customizadas &#8230;<\/span><\/p>\n\n\n\n<p><span style=\"color: #ff0000;\">Enquanto a pontua\u00e7\u00e3o geral de spam \u00e9 entre 5 e 15 ou mais de 15, \u00e9 prov\u00e1vel que a mensagem \u00e9 suspeito ou se \u00e9 spam. No entanto, a decis\u00e3o final ainda \u00e9 feita pelo <strong>recipient_mail_exchanger<\/strong><\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-outros-campos-de-cabecalho-de-e-mail\">Outros campos de cabe\u00e7alho de e-mail<\/h3>\n\n\n\n<p>Pode haver muitos outros campos de cabe\u00e7alho de mensagem padr\u00e3o \/ confi\u00e1veis, al\u00e9m de campos de cabe\u00e7alho de mensagem n\u00e3o padr\u00e3o \/ personalizados. Ambos tamb\u00e9m podem ser encontrados nos cabe\u00e7alhos de e-mail. Aqui est\u00e3o alguns exemplos:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Authentication-Results<\/strong> &#8211; relat\u00f3rio de autenticidade de sender_server_domain_name (baseado em SPF, DKIM e outros resultados).<\/li>\n\n\n\n<li><strong>List-ID<\/strong> &#8211; uma refer\u00eancia de <a href=\"https:\/\/pt.wikipedia.org\/wiki\/Lista_de_discuss%C3%A3o\">lista de discuss\u00e3o<\/a><\/li>\n\n\n\n<li><strong>List-Unsubscribe<\/strong> &#8211; uma refer\u00eancia direta que pode ser usada para cancelar a assinatura de uma lista de discuss\u00e3o.<\/li>\n\n\n\n<li><strong>Envio Autom\u00e1tico<\/strong> &#8211; indica que uma mensagem foi gerada automaticamente por um sistema (por exemplo, mensagens de notifica\u00e7\u00e3o, &#8230;)<\/li>\n\n\n\n<li>&#8230;<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-campos-de-cabecalho-de-e-mail-e-mensagens-criptografadas-de-ponta-a-ponta\">Campos de cabe\u00e7alho de e-mail e <a href=\"https:\/\/blog.mailfence.com\/pt\/criptografia-simetrica\/\">mensagens criptografadas<\/a> de ponta a ponta<\/h2>\n\n\n\n<p>Os campos de cabe\u00e7alho de e-mail geralmente s\u00e3o lidos independentemente do corpo da mensagem que <a href=\"https:\/\/blog.mailfence.com\/pt\/criptografia-e-mail-ponta-a-ponta-como-funciona\/\">\u00e9 criptografado de ponta a ponta<\/a> e deve ser lido pelo cliente (por exemplo, quem mant\u00e9m a chave privada em um sistema <a href=\"https:\/\/pt.wikipedia.org\/wiki\/Criptografia_de_chave_p%C3%BAblica\">criptogr\u00e1fico de chave p\u00fablica<\/a>). Aqui est\u00e3o alguns dos campos de cabe\u00e7alho de mensagem comuns que podem indicar uma mensagem criptografada e \/ ou assinada.<\/p>\n\n\n\n<p>Com base na mensagem de amostra acima:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">Content-Type: multipart\/signed; micalg=pgp-sha1; protocol=\"application\/pgp-signature\"\n....\nContent-Type: application\/pgp-signature\nContent-Description: OpenPGP digital signature\nContent-Disposition: attachment<\/pre>\n\n\n\n<p><span style=\"color: #3366ff;\">Indica um tipo MIME &#8216;multipart \/ signed&#8217; para a mensagem assinada do OpenPGP enviada como um anexo. As assinaturas do OpenPGP tamb\u00e9m podem ser enviadas on-line (n\u00e3o como um anexo).<\/span><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">Content-Type: multipart\/encrypted; protocol=\"application\/pgp-encrypted\"; \n...\nContent-Type: application\/octet-stream; name=encrypted.asc\nContent-Transfer-Encoding: ... (base64, 7bit, ...)\nContent-Description: OpenPGP encrypted message\nContent-Disposition: inline; filename=...<\/pre>\n\n\n\n<p>&#8230; <span style=\"color: #3366ff;\"><br>Indica um tipo MIME &#8216;multipart \/ criptografado&#8217; para a mensagem criptografada do OpenPGP enviada como um anexo. As mensagens criptografadas do OpenPGP tamb\u00e9m podem ser enviadas on-line (n\u00e3o como um anexo).<\/span><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">-----BEGIN PGP SIGNATURE-----\n...\n-----END PGP SIGNATURE-----<\/pre>\n\n\n\n<p><span style=\"color: #3366ff;\">Indica o in\u00edcio e o fim de uma assinatura do OpenPGP.<\/span><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">-----BEGIN PGP MESSAGE-----\n...\n-----END PGP MESSAGE-----<\/pre>\n\n\n\n<p><span style=\"color: #3366ff;\">Indica o in\u00edcio e o fim de uma mensagem criptografada do OpenPGP.<\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-protegendo-cabecalhos-de-e-mail-com-criptografia-de-ponta-a-ponta\">Protegendo cabe\u00e7alhos de e-mail com criptografia de ponta a ponta<\/h3>\n\n\n\n<p>Use criptografia de ponta a ponta e assinaturas digitais para verificar a legitimidade dos cabe\u00e7alhos das mensagens.<\/p>\n\n\n\n<p>O Mailfence integra os campos de <strong>From<\/strong>&nbsp;(<strong>De)<\/strong>,&nbsp; <strong>To (Para)<\/strong><b>&nbsp;<\/b>e <strong>Time-stamp (<\/strong>carimbo de hora<strong>)&nbsp;<\/strong>no corpo da mensagem antes de assin\u00e1-lo e \/ ou criptograf\u00e1-lo. Isso permite que o destinat\u00e1rio verifique:<\/p>\n\n\n\n<figure class=\"wp-block-image alignleft\"><img loading=\"lazy\" decoding=\"async\" width=\"176\" height=\"31\" src=\"https:\/\/blog.mailfence.com\/wp-content\/uploads\/2018\/11\/Digital_signature_validation_message.jpg\" alt=\"Cabe\u00e7alho do e-mail\" class=\"wp-image-7955\" srcset=\"https:\/\/blog.mailfence.com\/wp-content\/uploads\/2018\/11\/Digital_signature_validation_message.jpg 176w, https:\/\/blog.mailfence.com\/wp-content\/uploads\/2018\/11\/Digital_signature_validation_message-160x28.jpg 160w\" sizes=\"auto, (max-width: 176px) 100vw, 176px\" \/><\/figure>\n\n\n\n<p>&nbsp;From: example@gmail.com<br>To: example@mailfence.com<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Se os endere\u00e7os <strong>From (De)<\/strong> e <strong>To (Para)<\/strong> corresponderem realmente aos endere\u00e7os do remetente e do destinat\u00e1rio inclu\u00eddos no corpo da mensagem assinada e \/ ou criptografada. Isso ajuda a detectar poss\u00edveis falsifica\u00e7\u00f5es do endere\u00e7o do remetente \/ destinat\u00e1rio.<\/li>\n\n\n\n<li>Se a data de envio da mensagem corresponder (ou estiver substancialmente pr\u00f3xima) do timestamp inclu\u00eddo no corpo da mensagem assinada e \/ ou criptografada. Isso ajuda a detectar um poss\u00edvel <a href=\"https:\/\/en.wikipedia.org\/wiki\/Replay_attack\">ataque de repeti\u00e7\u00e3o<\/a>&nbsp;(Replay Attack) na mensagem.<\/li>\n<\/ul>\n\n\n\n<p>A inclus\u00e3o dos campos de cabe\u00e7alho de mensagem reais no corpo de uma <a href=\"https:\/\/blog.mailfence.com\/pt\/criptografia-simetrica\/\">mensagem criptografada<\/a> tamb\u00e9m pode ajudar a evitar vazamentos de metadados (por exemplo, <a href=\"https:\/\/github.com\/autocrypt\/memoryhole\">cabe\u00e7alhos de e-mail seguros<\/a>).<\/p>\n\n\n\n<p>Muitas ferramentas de terceiros para analisar o cabe\u00e7alho da mensagem (https:\/\/testconnectivity.microsoft.com\/, https:\/\/toolbox.googleapps.com\/apps\/messageheader\/, https:\/\/mxtoolbox.com\/ EmailHeaders.aspx, &#8230;) produz um relat\u00f3rio de f\u00e1cil leitura a partir dos dados nesse cabe\u00e7alho de mensagem. No entanto, por favor, note que voc\u00ea ter\u00e1 que compartilhar o cabe\u00e7alho da sua mensagem com esses servi\u00e7os &#8230;<\/p>\n\n\n\n<p>O Mailfence \u00e9 uma solu\u00e7\u00e3o de mensagens seguras e privadas que oferece aos usu\u00e1rios controle total sobre seus dados.<\/p>\n\n\n\n<p><em>Junte-se \u00e0 luta pela privacidade online e pela liberdade digital.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Esta postagem de blog explicar\u00e1 como ler e entender o &#8220;cabe\u00e7alho de e-mail&#8221; que acompanha todos os e-mails. Ele cont\u00e9m detalhes sobre o remetente, a rota tomada e o destinat\u00e1rio. Use essas informa\u00e7\u00f5es para evitar e-mails indesejados ou para reconhecer um golpe ou malware entregue por e-mail. Como acessar o cabe\u00e7alho da mensagem Na interface [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":85833,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1379],"tags":[],"class_list":["post-64428","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 v27.4 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Campos de cabe\u00e7alho do e-mail e informa\u00e7\u00f5es sobre SPF, DKIM.<\/title>\n<meta name=\"description\" content=\"A maioria dos clientes de e-mail permite acesso ao cabe\u00e7alho da mensagem. 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