{"id":18331,"date":"2024-04-04T16:42:50","date_gmt":"2024-04-04T14:42:50","guid":{"rendered":"https:\/\/www.alinto.com\/?p=18331"},"modified":"2024-04-04T16:42:50","modified_gmt":"2024-04-04T14:42:50","slug":"delivrabilite-mail-dmarc","status":"publish","type":"post","link":"https:\/\/www.alinto.com\/fr\/delivrabilite-mail-dmarc\/","title":{"rendered":"D\u00e9livrabilit\u00e9 email : et si on d\u00e9mystifiait le DMARC ?"},"content":{"rendered":"<p><b>D\u00e9but f\u00e9vrier 2024, Google et Yahoo! ont annonc\u00e9 leur volont\u00e9 de mieux contr\u00f4ler l&rsquo;authentification des mails \u00e0 destination de leurs plateformes. Ainsi, les entreprises envoyant plus de 5 000 mails par jour \u00e0 des adresses Google ou Yahoo! devront obligatoirement mettre en place la m\u00e9thode DMARC en plus des protocoles SPF et DKIM. L\u2019occasion pour Alinto de faire le point sur l\u2019int\u00e9r\u00eat de DMARC et son r\u00e9el impact sur la s\u00e9curit\u00e9 du mail.<\/b><\/p>\n<h2><span style=\"font-weight: 400;\">De quoi s\u2019agit-il ?<\/span><\/h2>\n<p><span style=\"font-weight: 400;\"><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-18338 alignleft\" src=\"https:\/\/www.alinto.com\/wp-content\/uploads\/2024\/03\/AdobeStock_233944854-700x467.jpeg\" alt=\"D\u00e9livrabilit\u00e9 du mail\" width=\"359\" height=\"239\" srcset=\"https:\/\/www.alinto.com\/wp-content\/uploads\/2024\/03\/AdobeStock_233944854-700x467.jpeg 700w, https:\/\/www.alinto.com\/wp-content\/uploads\/2024\/03\/AdobeStock_233944854-1024x683.jpeg 1024w, https:\/\/www.alinto.com\/wp-content\/uploads\/2024\/03\/AdobeStock_233944854-768x512.jpeg 768w, https:\/\/www.alinto.com\/wp-content\/uploads\/2024\/03\/AdobeStock_233944854-1536x1024.jpeg 1536w, https:\/\/www.alinto.com\/wp-content\/uploads\/2024\/03\/AdobeStock_233944854-2048x1365.jpeg 2048w, https:\/\/www.alinto.com\/wp-content\/uploads\/2024\/03\/AdobeStock_233944854-500x333.jpeg 500w\" sizes=\"auto, (max-width: 359px) 100vw, 359px\" \/>La m\u00e9thode DMARC, aussi appel\u00e9e Domain-based Message Authentication, Reporting and Conformance, est un protocole de validation d\u2019authenticit\u00e9 des courriels. Il permet aux administrateurs de messagerie d&#8217;emp\u00eacher les pirates informatiques d&rsquo;usurper l&rsquo;identit\u00e9 de leur organisation et de leur domaine.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Concr\u00e8tement, DMARC renforce le contr\u00f4le des mails r\u00e9ceptionn\u00e9s sur une plateforme. Il\u00a0 indique aussi comment traiter ce mail s\u2019il provient d\u2019une source non d\u00e9clar\u00e9e par l\u2019administrateur (tentative d\u2019usurpation). Ainsi, trois solutions sont possibles :<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">soit le mail est tout simplement rejet\u00e9 (politique la plus s\u00e9curis\u00e9e);<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">soit il est mis en quarantaine afin de pouvoir l\u2019examiner avant un \u00e9ventuelle distribution ou le rejet ;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">soit rien n\u2019est fait. et c\u2019est l\u2019anti-spam du destinataire qui d\u00e9cidera de la conduite \u00e0 tenir.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Pour autant, la m\u00e9thode DMARC reste encore peu utilis\u00e9e. En t\u00e9moigne une \u00e9tude de l\u2019<\/span><a href=\"https:\/\/www.afnic.fr\/observatoire-ressources\/papier-expert\/spf-dkim-et-dmarc-ou-en-sommes-nous-sur-le-fr\/\"><span style=\"font-weight: 400;\">AFNIC<\/span><\/a><span style=\"font-weight: 400;\"> datant de mars 2023, selon laquelle moins de 10 % de noms de domaine en .fr ont mis en place la m\u00e9thode DMARC.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">DMARC, SPF, DKIM : quels liens ?<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Pour autant, afin d\u2019\u00eatre un tant soit peu efficace, le DMARC doit surtout \u00eatre coupl\u00e9 avec les protocoles <a href=\"https:\/\/www.alinto.com\/fr\/authentification-email-protocole-spf\/\">SPF<\/a> et <a href=\"https:\/\/www.alinto.com\/fr\/authentification-email-protocole-dkim\/\">DKIM<\/a>. Utilis\u00e9s ensemble, ils prot\u00e8gent les exp\u00e9diteurs et destinataires contre les mails frauduleux au m\u00eame titre que le DMARC. Revenons donc aux protocoles SPF et DKIM.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Tout d\u2019abord, le protocole SPF. Il s\u2019agit d\u2019un m\u00e9canisme d\u2019authentification de la provenance des courriers \u00e9lectroniques. Il permet aux administrateurs de domaines exp\u00e9diteurs de sp\u00e9cifier les adresses IP autoris\u00e9es \u00e0 envoyer des mails en leur nom. Ainsi, lors de la r\u00e9ception d\u2019un mail, le serveur de messagerie du destinataire peut v\u00e9rifier si l\u2019adresse IP de l\u2019exp\u00e9diteur est autoris\u00e9e par le domaine d&rsquo;origine \u00e0 envoyer des courriels. Si c\u2019est le cas, le courriel est alors consid\u00e9r\u00e9 comme l\u00e9gitime.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">DKIM, quant \u00e0 lui, a \u00e9t\u00e9 con\u00e7u pour v\u00e9rifier l\u2019authenticit\u00e9 du domaine d\u2019envoi et l\u2019int\u00e9grit\u00e9 d\u2019un courriel. Il permet aux fournisseurs de services de messagerie de v\u00e9rifier que les mails re\u00e7us proviennent bel et bien du domaine indiqu\u00e9 et n\u2019ont pas \u00e9t\u00e9 alt\u00e9r\u00e9s lors de leur transit.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Pour qu\u2019un message passe la validation DMARC, il est imp\u00e9ratif qu\u2019il ait \u00e9t\u00e9 authentifi\u00e9 par SPF et DKIM. Le d\u00e9ploiement de DMARC n\u00e9cessite donc pr\u00e9alablement le d\u00e9ploiement des protocoles SPF et DKIM.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">DMARC, v\u00e9ritable int\u00e9r\u00eat ou effet marketing ?<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">C\u2019est donc avec la ferme intention de lutter contre le spam que Google et Yahoo! ont d\u00e9cid\u00e9 de durcir les contr\u00f4les d&rsquo;authentification des mails qui sont destin\u00e9s \u00e0 leurs plateformes.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">N\u00e9anmoins, au regard du r\u00f4le que jouent les protocoles SPF et DKIM, d\u2019aucuns pourraient se demander si la m\u00e9thode DMARC est v\u00e9ritablement n\u00e9cessaire. Chez Alinto, nous y voyons aussi un effet marketing de la part des deux g\u00e9ants de la tech, et ce, pour plusieurs raisons :<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Tout d\u2019abord, la m\u00e9thode DMARC est inop\u00e9rante sans les protocoles SPF et DKIM. Ces deux-l\u00e0 agissent comme un premier filtre pour identifier la provenance des mails. Et souvent le DMARC n\u2019ajoute rien puisque le SPF peut produire les m\u00eames effets, notamment s\u2019il est param\u00e9tr\u00e9 pour rejeter tous les mails ayant une provenance douteuse.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Dans la majorit\u00e9 des cas, les entreprises configurent leur DMARC (p=none) afin de laisser la main \u00e0 l\u2019anti-spam du destinataire et le laisser g\u00e9rer les autorisations et blocages de mails. Ainsi, pour bien se prot\u00e9ger, il reste n\u00e9cessaire d\u2019avoir une solution de s\u00e9curit\u00e9 contre le phishing, via les anti spam qui tirent aujourd\u2019hui parti de l\u2019IA et d\u2019am\u00e9liorations continues des techniques de filtrage.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Cela dit, le DMARC demeure important pour la r\u00e9putation, notamment de domaines dont il est tentant d&rsquo;usurper l&rsquo;identit\u00e9 (grandes entreprises, services publics, financiers,&#8230;).\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Chez Alinto, nous pensons qu&rsquo;abondance de biens ne nuit pas et nous conseillons de mettre en place une politique DMARC et le faisons pour nos clients. Nous rappelons aussi que la meilleure s\u00e9curisation et politique d\u2019authentification, en r\u00e9ponse aux directives de Google et Yahoo! passent surtout par la bonne mise en \u0153uvre des protocoles SPF et DKIM, tout autant que la qualit\u00e9 des antispams d\u00e9ploy\u00e9s.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>D\u00e9but f\u00e9vrier 2024, Google et Yahoo! ont annonc\u00e9 leur volont\u00e9 de mieux contr\u00f4ler l&rsquo;authentification des mails (&#8230;)<\/p>\n","protected":false},"author":22,"featured_media":18334,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[123],"tags":[],"class_list":["post-18331","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-emails"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>D\u00e9livrabilit\u00e9 email : et si on d\u00e9mystifiait le DMARC ? - Alinto<\/title>\n<meta name=\"description\" content=\"DMARC est un protocole crucial pour les entreprises envoyant plus de 5000 mails par jour \u00e0 des adresses Google ou Yahoo!.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.alinto.com\/fr\/delivrabilite-mail-dmarc\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"D\u00e9livrabilit\u00e9 email : et si on d\u00e9mystifiait le DMARC ? - Alinto\" \/>\n<meta property=\"og:description\" content=\"DMARC est un protocole crucial pour les entreprises envoyant plus de 5000 mails par jour \u00e0 des adresses Google ou Yahoo!.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.alinto.com\/fr\/delivrabilite-mail-dmarc\/\" \/>\n<meta property=\"og:site_name\" content=\"Alinto\" \/>\n<meta property=\"article:published_time\" content=\"2024-04-04T14:42:50+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.alinto.com\/wp-content\/uploads\/2024\/03\/AdobeStock_298810361-scaled.jpeg\" \/>\n\t<meta property=\"og:image:width\" content=\"2560\" \/>\n\t<meta property=\"og:image:height\" content=\"1498\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Juliette Pointurier\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Juliette Pointurier\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.alinto.com\\\/fr\\\/delivrabilite-mail-dmarc\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.alinto.com\\\/fr\\\/delivrabilite-mail-dmarc\\\/\"},\"author\":{\"name\":\"Juliette Pointurier\",\"@id\":\"https:\\\/\\\/www.alinto.com\\\/fr\\\/#\\\/schema\\\/person\\\/19b0e75d7222bc9feeeb7b84d90f95b9\"},\"headline\":\"D\u00e9livrabilit\u00e9 email : et si on d\u00e9mystifiait le DMARC ?\",\"datePublished\":\"2024-04-04T14:42:50+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.alinto.com\\\/fr\\\/delivrabilite-mail-dmarc\\\/\"},\"wordCount\":844,\"publisher\":{\"@id\":\"https:\\\/\\\/www.alinto.com\\\/fr\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.alinto.com\\\/fr\\\/delivrabilite-mail-dmarc\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.alinto.com\\\/wp-content\\\/uploads\\\/2024\\\/03\\\/AdobeStock_298810361-scaled.jpeg\",\"articleSection\":[\"Emails\"],\"inLanguage\":\"fr-FR\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.alinto.com\\\/fr\\\/delivrabilite-mail-dmarc\\\/\",\"url\":\"https:\\\/\\\/www.alinto.com\\\/fr\\\/delivrabilite-mail-dmarc\\\/\",\"name\":\"D\u00e9livrabilit\u00e9 email : et si on d\u00e9mystifiait le DMARC ? 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