{"id":5276,"date":"2025-12-19T17:31:56","date_gmt":"2025-12-19T17:31:56","guid":{"rendered":"https:\/\/mgcomdev.wpenginepowered.com\/glossary\/email-spoofing-2\/"},"modified":"2026-09-14T14:36:29","modified_gmt":"2026-09-14T14:36:29","slug":"usurpation-email","status":"publish","type":"glossary","link":"https:\/\/www.mailgun.com\/fr\/glossaire\/usurpation-email\/","title":{"rendered":"Usurpation d&#8217;email"},"content":{"rendered":"<h1>Usurpation d&#8217;email<\/h1>\n<p><span data-contrast=\"none\">L&rsquo;usurpation d&#8217;email est la pratique consistant \u00e0 falsifier les en-t\u00eates d&#8217;email \u2013 en particulier l&rsquo;adresse \u00ab\u00a0De\u00a0\u00bb \u2013 pour faire croire qu&rsquo;un message a \u00e9t\u00e9 envoy\u00e9 par une autre personne.\u00a0<\/span><span data-contrast=\"none\">Elle est<\/span><span data-contrast=\"none\"> couramment utilis\u00e9e dans les campagnes de hame\u00e7onnage et <\/span><span data-contrast=\"none\">d&rsquo;escroquerie<\/span><span data-contrast=\"none\"> pour se faire passer pour des marques, des organisations ou des personnes de confiance.<\/span><span data-ccp-props=\"{\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"none\">L&rsquo;usurpation implique g\u00e9n\u00e9ralement\u00a0:<\/span><span data-ccp-props=\"{\">\u00a0<\/span><\/p>\n<ul>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"93\" data-list-defn-props=\"{\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">Falsifier l&rsquo;adresse de l&rsquo;en-t\u00eate \u00ab\u00a0De\u00a0\u00bb (celle visible par les utilisateurs et utilisatrices)<\/span><span data-ccp-props=\"{\">\u00a0<\/span><\/li>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"93\" data-list-defn-props=\"{\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">Contourner ou \u00e9chouer aux contr\u00f4les d&rsquo;authentification (comme SPF, DKIM et DMARC)<\/span><span data-ccp-props=\"{\">\u00a0<\/span><\/li>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"93\" data-list-defn-props=\"{\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">Envoyer depuis des serveurs ou adresses IP non autoris\u00e9s pour exploiter la confiance envers le domaine<\/span><span data-ccp-props=\"{\">\u00a0<\/span><\/li>\n<\/ul>\n<p><span data-contrast=\"none\">Les emails usurp\u00e9s <\/span><span data-contrast=\"none\">ne n\u00e9cessitent pas<\/span><span data-contrast=\"none\"> d&rsquo;acc\u00e9der \u00e0 l&rsquo;infrastructure de l&rsquo;exp\u00e9diteur usurp\u00e9\u00a0: ils s&rsquo;appuient sur une authentification de domaine faible ou absente pour passer inaper\u00e7us.<\/span><span data-ccp-props=\"{\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"none\">L&rsquo;activation de DMARC avec des politiques strictes aide les titulaires de domaines \u00e0 emp\u00eacher des tiers non autoris\u00e9s d&rsquo;usurper leur domaine. Les destinataires peuvent \u00e9galement utiliser ces signaux d&rsquo;authentification pour rejeter ou mettre en quarantaine les messages suspects.<\/span><span data-ccp-props=\"{\">\u00a0<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Usurpation d&#8217;email L&rsquo;usurpation d&#8217;email est la pratique consistant \u00e0 falsifier les en-t\u00eates d&#8217;email \u2013 en particulier l&rsquo;adresse \u00ab\u00a0De\u00a0\u00bb \u2013 pour faire croire qu&rsquo;un message a \u00e9t\u00e9 envoy\u00e9 par une autre personne.\u00a0Elle est couramment utilis\u00e9e dans les campagnes de hame\u00e7onnage et d&rsquo;escroquerie pour se faire passer pour des marques, des organisations ou des personnes de confiance.\u00a0 [&hellip;]<\/p>\n","protected":false},"author":1,"template":"","meta":{"_acf_changed":false},"class_list":["post-5276","glossary","type-glossary","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Usurpation d&#039;email \u2013 Glossaire des termes d&#039;email | Mailgun<\/title>\n<meta name=\"description\" content=\"Les cybercriminels utilisent l&#039;usurpation d&#039;email pour inciter les destinataires \u00e0 ouvrir un spam. 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