{"id":65,"date":"2025-09-10T19:30:29","date_gmt":"2025-09-10T19:30:29","guid":{"rendered":"https:\/\/www.dae-pro.fr\/blog\/?p=65"},"modified":"2025-09-10T19:30:30","modified_gmt":"2025-09-10T19:30:30","slug":"securite-des-emails-pourquoi-le-spf-et-le-dkim-ne-suffisent-plus","status":"publish","type":"post","link":"https:\/\/www.dae-pro.fr\/blog\/securite-des-emails-pourquoi-le-spf-et-le-dkim-ne-suffisent-plus\/","title":{"rendered":"S\u00e9curit\u00e9 des emails : pourquoi le SPF et le DKIM ne suffisent plus\u00a0?"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Les emails restent l\u2019un des vecteurs les plus utilis\u00e9s pour <strong>les attaques informatiques<\/strong>, qu\u2019il s\u2019agisse de phishing, de spam ou d\u2019usurpation d\u2019identit\u00e9. Historiquement, les protocoles SPF et DKIM ont \u00e9t\u00e9 adopt\u00e9s pour authentifier les exp\u00e9diteurs et limiter les fraudes. Pourtant, face \u00e0 la sophistication croissante des attaques, ces solutions ne garantissent plus une s\u00e9curit\u00e9 compl\u00e8te.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>SPF et DKIM : comment ces protocoles prot\u00e8gent vos emails<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>SPF (Sender Policy Framework)<\/strong> permet de v\u00e9rifier que l\u2019adresse IP d\u2019un serveur exp\u00e9diteur est autoris\u00e9e \u00e0 envoyer des emails pour un domaine donn\u00e9. Cela aide \u00e0 r\u00e9duire l\u2019usurpation d\u2019adresse.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>DKIM (DomainKeys Identified Mail)<\/strong> ajoute une signature cryptographique aux emails, permettant au serveur r\u00e9cepteur de confirmer que le message n\u2019a pas \u00e9t\u00e9 modifi\u00e9 et qu\u2019il provient bien du domaine indiqu\u00e9.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ces deux protocoles ont largement contribu\u00e9 \u00e0 <strong>r\u00e9duire le spam et les tentatives de phishing basiques<\/strong>, en renfor\u00e7ant la fiabilit\u00e9 des exp\u00e9diteurs.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Pourquoi SPF et DKIM ne suffisent plus&nbsp;?<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Malgr\u00e9 leur efficacit\u00e9 initiale, SPF et DKIM pr\u00e9sentent des limites face aux menaces modernes\u202f:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Absence de v\u00e9rification du contenu<\/strong> : un email peut \u00eatre authentifi\u00e9 mais contenir du phishing ou des liens malveillants.<\/li>\n\n\n\n<li><strong>Faux positifs ou d\u00e9faillances techniques<\/strong> : certaines configurations erron\u00e9es ou d\u00e9faillantes peuvent laisser passer des emails malveillants.<\/li>\n\n\n\n<li><strong>Usurpation plus sophistiqu\u00e9e<\/strong> : les attaquants utilisent des techniques comme le spoofing de sous-domaines ou des compromis de serveurs l\u00e9gitimes, \u00e9chappant aux v\u00e9rifications SPF et DKIM.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Ainsi, se reposer uniquement sur ces deux protocoles <strong>ne prot\u00e8ge pas contre les attaques avanc\u00e9es<\/strong> et peut donner une fausse impression de s\u00e9curit\u00e9.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Les nouvelles mesures pour renforcer la s\u00e9curit\u00e9 des emails<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Pour compl\u00e9ter SPF et DKIM, plusieurs strat\u00e9gies et technologies sont aujourd\u2019hui recommand\u00e9es\u202f:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>DMARC (Domain-based Message Authentication, Reporting &amp; Conformance)<\/strong>\u202f: ce protocole permet de d\u00e9finir comment les serveurs r\u00e9cepteurs doivent traiter les emails \u00e9chouant aux v\u00e9rifications SPF et DKIM, et fournit des rapports sur les tentatives d\u2019usurpation.<\/li>\n\n\n\n<li><strong>Filtrage avanc\u00e9 et analyse du contenu<\/strong>\u202f: les solutions modernes d\u00e9tectent les liens malveillants, les pi\u00e8ces jointes suspectes et le phishing bas\u00e9 sur le contenu.<\/li>\n\n\n\n<li><strong>Authentification multi-facteur et protection des bo\u00eetes mail<\/strong>\u202f: m\u00eame si un email l\u00e9gitime est compromis, l\u2019acc\u00e8s au compte est prot\u00e9g\u00e9.<\/li>\n\n\n\n<li><strong>Sensibilisation des utilisateurs<\/strong>\u202f: former les \u00e9quipes \u00e0 identifier les emails suspects reste indispensable pour r\u00e9duire le risque humain.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Ces mesures permettent de <strong>prot\u00e9ger les communications tout en limitant la propagation des menaces<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A LIRE AUSSI <a href=\"https:\/\/www.dae-pro.fr\/blog\/shadow-it-comment-detecter-les-applications-non-declarees-dans-lentreprise\/\" target=\"_blank\" rel=\"noreferrer noopener\">Shadow IT : comment d\u00e9tecter les applications non d\u00e9clar\u00e9es dans l\u2019entreprise\u00a0?<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Cas concrets : attaques contournant SPF et DKIM<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Plusieurs incidents r\u00e9cents montrent que <strong>les attaques peuvent passer malgr\u00e9 SPF et DKIM<\/strong>\u202f:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Des campagnes de phishing utilisant des sous-domaines proches du domaine original pour tromper les filtres.<\/li>\n\n\n\n<li>Des emails envoy\u00e9s depuis des serveurs compromis mais l\u00e9gitimes, valid\u00e9s par SPF et DKIM.<\/li>\n\n\n\n<li>Des attaques cibl\u00e9es combinant emails et r\u00e9seaux sociaux, rendant la simple authentification insuffisante.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Ces exemples illustrent l\u2019importance de <strong>mettre en place des protections compl\u00e9mentaires<\/strong> pour s\u00e9curiser les \u00e9changes \u00e9lectroniques.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Les emails restent l\u2019un des vecteurs les plus utilis\u00e9s pour les attaques informatiques, qu\u2019il s\u2019agisse de phishing, de spam ou d\u2019usurpation d\u2019identit\u00e9. Historiquement, les protocoles<\/p>\n","protected":false},"author":2,"featured_media":66,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-65","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cyber-securite"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>S\u00e9curit\u00e9 des emails : pourquoi le SPF et le DKIM ne suffisent plus\u00a0? - DAE-Pro<\/title>\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.dae-pro.fr\/blog\/securite-des-emails-pourquoi-le-spf-et-le-dkim-ne-suffisent-plus\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"S\u00e9curit\u00e9 des emails : pourquoi le SPF et le DKIM ne suffisent plus\u00a0? - DAE-Pro\" \/>\n<meta property=\"og:description\" content=\"Les emails restent l\u2019un des vecteurs les plus utilis\u00e9s pour les attaques informatiques, qu\u2019il s\u2019agisse de phishing, de spam ou d\u2019usurpation d\u2019identit\u00e9. 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