{"id":5576,"date":"2021-01-12T13:57:26","date_gmt":"2021-01-12T13:57:26","guid":{"rendered":"https:\/\/kb.mailfence.com\/kb\/comment-mettre-en-place-une-defense-anti-spoofing-pour-mon-domaine\/"},"modified":"2025-01-21T10:22:37","modified_gmt":"2025-01-21T10:22:37","slug":"defense-usurpation-identite","status":"publish","type":"ht_kb","link":"https:\/\/kb.mailfence.com\/fr\/kb\/defense-usurpation-identite\/","title":{"rendered":"Comment mettre en place une d\u00e9fense anti-spoofing pour mon domaine ?"},"content":{"rendered":"\n<h1 class=\"wp-block-heading has-text-align-center\" id=\"h-obligatoire\">Obligatoire<\/h1>\n\n\n\n<p>Vous n&rsquo;avez pas besoin d&rsquo;effectuer de modifications si vous utilisez uniquement des adresses bas\u00e9es sur le nom de domaine mailfence.com. Cependant, si vous avez <a href=\"https:\/\/kb.mailfence.com\/fr\/?post_type=ht_kb&amp;p=5702\">ajout\u00e9 votre propre nom de domaine<\/a>, vous devez configurer les entr\u00e9es DNS suivantes afin d&#8217;emp\u00eacher l&rsquo;<a href=\"https:\/\/blog.mailfence.com\/fr\/spoofing-protection-spf-dkim-et-dmarc\/\">usurpation d&rsquo;adresse \u00e9lectronique<\/a> et d&rsquo;assurer la d\u00e9livrabilit\u00e9 :<\/p>\n\n\n\n<div class=\"wp-block-ht-block-toc is-style-outline htoc htoc--position-wide toc-list-style-plain\" data-htoc-state=\"expanded\"><span class=\"htoc__title\"><span class=\"ht_toc_title\">Table des mati\u00e8res<\/span><span class=\"htoc__toggle\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\"><g fill=\"#444\"><path d=\"M15 7H1c-.6 0-1 .4-1 1s.4 1 1 1h14c.6 0 1-.4 1-1s-.4-1-1-1z\"><\/path><path d=\"M15 1H1c-.6 0-1 .4-1 1s.4 1 1 1h14c.6 0 1-.4 1-1s-.4-1-1-1zM15 13H1c-.6 0-1 .4-1 1s.4 1 1 1h14c.6 0 1-.4 1-1s-.4-1-1-1z\"><\/path><\/g><\/svg><\/span><\/span><div class=\"htoc__itemswrap\"><ul class=\"ht_toc_list\"><li class=\"\"><a href=\"#h-sender-policy-framework-spf\"><\/a><a href=\"#h-sender-policy-framework-spf\">Sender Policy Framework (SPF) :<\/a><\/li><li class=\"\"><a href=\"#h-domain-keys-identified-mail-dkim\"><\/a><a href=\"#h-domain-keys-identified-mail-dkim\">Courrier identifi\u00e9 par des cl\u00e9s de domaine (DKIM)<\/a><\/li><li class=\"\"><a href=\"#h-domain-based-message-authentication-reporting-and-conformance-dmarc\"><\/a><a href=\"#h-domain-based-message-authentication-reporting-and-conformance-dmarc\">Authentification, notification et conformit\u00e9 des messages par domaine (DMARC)<\/a><\/li><li class=\"\"><a href=\"#h-mail-transfer-agent-strict-transport-security-mta-sts\"><\/a><a href=\"#h-mail-transfer-agent-strict-transport-security-mta-sts\">Agent de transfert de courrier &#8211; S\u00e9curit\u00e9 stricte du transport (MTA-STS)<\/a><\/li><\/ul><\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-sender-policy-framework-spf\">Sender Policy Framework (SPF) :<\/h2>\n\n\n\n<p>1. Acc\u00e9dez \u00e0 votre compte <strong>Param\u00e8tres <strong>\u2192<\/strong><\/strong> <strong>Messages <strong>\u2192<\/strong><\/strong> <strong>Domaines <\/strong>de messagerie.<\/p>\n\n\n\n<p>2. Sur votre <strong>entr\u00e9e de nom de domaine<\/strong>, cliquez sur <strong>SPF<\/strong>.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"976\" height=\"256\" src=\"https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-3.png\" alt=\"d\u00e9fense contre l'usurpation d'identit\u00e9 - SPF\" class=\"wp-image-4234\" srcset=\"https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-3.png 976w, https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-3-300x79.png 300w, https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-3-768x201.png 768w, https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-3-50x13.png 50w, https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-3-60x16.png 60w, https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-3-100x26.png 100w\" sizes=\"auto, (max-width: 976px) 100vw, 976px\" \/><figcaption class=\"wp-element-caption\"><strong>Copiez<\/strong> la valeur de l&rsquo;enregistrement SPF pour l&rsquo;ajouter \u00e0 votre nom de domaine, votre h\u00e9bergement ou votre fournisseur de services DNS.<\/figcaption><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-ht-blocks-messages wp-block-hb-message wp-block-hb-message--withicon is-style-info\">Un enregistrement TXT est un type d&rsquo;<a href=\"https:\/\/fr.wikipedia.org\/wiki\/Domain_Name_System\">enregistrement de ressources<\/a> dans le syst\u00e8me de noms de domaine (DNS).<br>Pour en savoir plus <a href=\"https:\/\/en.wikipedia.org\/wiki\/TXT_record\">, cliquez ici<\/a>. <strong>Veuillez vous r\u00e9f\u00e9rer \u00e0 la documentation de votre fournisseur de services de noms de domaine pour conna\u00eetre les \u00e9tapes exactes de l&rsquo;ajout d&rsquo;un enregistrement TXT.<\/strong> <\/p>\n\n\n\n<p class=\"wp-block-ht-blocks-messages wp-block-hb-message wp-block-hb-message--withicon is-style-info\">La propagation des enregistrements DNS peut prendre un certain temps.\nVous pouvez utiliser <a href=\"\">cet outil<\/a> pour v\u00e9rifier. <\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Si les courriels sont envoy\u00e9s uniquement via les serveurs de mailfence.com (webmail, SMTPAuth, ActiveSync, forwarding), utilisez la valeur suivante :<br>v=spf1 include:_spf.mailfence.com <strong>-all<\/strong><\/li>\n\n\n\n<li>Si les courriers \u00e9lectroniques sont \u00e9galement envoy\u00e9s \u00e0 partir d&rsquo;autres serveurs, utilisez la valeur suivante :<br>v=spf1 include:_spf.mailfence.com <strong>~all<\/strong><\/li>\n<\/ul>\n\n\n\n<p>3. Une fois que l&rsquo;enregistrement DNS TXT correspondant a \u00e9t\u00e9 inclus avec succ\u00e8s, cliquez sur <strong>V\u00e9rifier<\/strong>.<\/p>\n\n\n\n<p>Remarque : si vous pr\u00e9voyez d<a href=\"https:\/\/fr.wikipedia.org\/wiki\/Sender_Policy_Framework\">&lsquo;\u00a0\u00bbinclure<\/a>\u00a0\u00bb plusieurs enregistrements SPF pour continuer \u00e0 authentifier les mails envoy\u00e9s par d&rsquo;autres fournisseurs, veuillez tenir compte de la <a href=\"https:\/\/tools.ietf.org\/html\/rfc7208#section-4.6.4\">limite de 10 recherches SPF<\/a>, qui peut entra\u00eener l&rsquo;\u00e9chec de l&rsquo;authentification SPF du c\u00f4t\u00e9 du destinataire. Vous pouvez automatiquement aplatir vos enregistrements SPF en utilisant le service externe de votre choix, par exemple <a href=\"https:\/\/autospf.com\/\">autospf.com<\/a> (fourni avec un plan gratuit), etc.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-courrier-identifie-par-des-cles-de-domaine-dkim\"><strong>Courrier identifi\u00e9 par des cl\u00e9s de domaine (DKIM)<\/strong><\/h2>\n\n\n\n<p>1. Vous pouvez soit continuer dans l&rsquo;assistant ci-dessus en cliquant sur <strong>Suivant<\/strong>, OU si vous le faites plus tard :<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Allez dans votre compte <strong>Param\u00e8tres <strong>\u2192<\/strong><\/strong> <strong>Messages <strong>\u2192<\/strong><\/strong> <strong>Domaines <\/strong>de messagerie.<\/li>\n\n\n\n<li>Sur votre <strong>entr\u00e9e de nom de domaine<\/strong>, cliquez sur <strong>DKIM<\/strong>.<\/li>\n<\/ol>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"976\" height=\"349\" src=\"https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-4.png\" alt=\"d\u00e9fense contre l'usurpation d'identit\u00e9 - DKIM\" class=\"wp-image-4235\" srcset=\"https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-4.png 976w, https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-4-300x107.png 300w, https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-4-768x275.png 768w, https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-4-50x18.png 50w, https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-4-60x21.png 60w, https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-4-100x36.png 100w\" sizes=\"auto, (max-width: 976px) 100vw, 976px\" \/><figcaption class=\"wp-element-caption\"><strong>Copiez<\/strong> les valeurs de DKIM Name\/Host et d&rsquo;enregistrement pour les ajouter \u00e0 votre nom de domaine, votre h\u00e9bergement ou votre fournisseur de services DNS.<\/figcaption><\/figure>\n<\/div>\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Il est recommand\u00e9 d&rsquo;utiliser une paire de cl\u00e9s DKIM de 2048 bits<\/strong>.\nSi votre nom de domaine\/h\u00e9bergeur ou votre fournisseur de services DNS ne supporte pas les valeurs DNS TXT longues, cliquez sur \u00ab\u00a0g\u00e9n\u00e9rer une cl\u00e9 de 1024 bits\u00a0\u00bb. <\/li>\n\n\n\n<li>Pour modifier (ou changer) votre paire de cl\u00e9s DKIM, consultez <a href=\"https:\/\/kb.mailfence.com\/fr\/?post_type=ht_kb&amp;p=5343\">cet article de la base de donn\u00e9es.<\/a><\/li>\n<\/ul>\n\n\n\n<p>3. Une fois que l&rsquo;enregistrement DNS TXT correspondant a \u00e9t\u00e9 inclus avec succ\u00e8s, cliquez sur <strong>V\u00e9rifier<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-ht-blocks-messages wp-block-hb-message wp-block-hb-message--withicon is-style-info\">La propagation des enregistrements DNS peut prendre un certain temps.\nVous pouvez utiliser <a href=\"\">cet outil<\/a> pour v\u00e9rifier. <\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Si un outil externe v\u00e9rifie l&rsquo;existence de votre cl\u00e9 DKIM mais que la validation \u00e9choue toujours au niveau de Mailfence, <em>mettez en place une <a href=\"https:\/\/tools.ietf.org\/html\/draft-allman-dkim-ssp-02\">politique de signature DKIM<\/a><\/em> en cr\u00e9ant l&rsquo;<strong>enregistrement DNS TXT<\/strong> suivant :<br>Name\/Host : <strong>_domainkey<\/strong><br>Valeur : <strong>o=~<\/strong>\n<ul class=\"wp-block-list\">\n<li>o=~&rsquo; signifie que \u00ab\u00a0certains courriers de ce domaine sont sign\u00e9s, mais pas tous\u00a0\u00bb.<\/li>\n\n\n\n<li>o=-\u00a0\u00bb signifie que \u00ab\u00a0tous les courriels de ce domaine sont sign\u00e9s\u00a0\u00bb.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Les courriers \u00e9lectroniques ne seront sign\u00e9s DKIM qu&rsquo;apr\u00e8s validation de l&rsquo;enregistrement DKIM correspondant.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator aligncenter has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading has-text-align-center\" id=\"h-en-option\">En option<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-authentification-notification-et-conformite-des-messages-par-domaine-dmarc\"><strong>Authentification, notification et conformit\u00e9 des messages par domaine (DMARC)<\/strong><\/h2>\n\n\n\n<p>1. Vous pouvez soit continuer dans l&rsquo;assistant ci-dessus en cliquant sur <strong>Suivant<\/strong>, OU si vous le faites plus tard :<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Allez dans votre compte <strong>Param\u00e8tres <strong>\u2192<\/strong><\/strong> <strong>Messages \u2192 Domaines <\/strong>de messagerie.<\/li>\n\n\n\n<li>Sur votre entr\u00e9e de nom de domaine, <strong>cliquez sur l&rsquo;une des entr\u00e9es DNS<\/strong> <strong>\u2192<\/strong> <strong>DMARC (optionnel<\/strong>).<\/li>\n<\/ol>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"342\" src=\"https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-7-1024x342.png\" alt=\"d\u00e9fense contre l'usurpation d'identit\u00e9 - DMARC\" class=\"wp-image-4239\" srcset=\"https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-7-1024x342.png 1024w, https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-7-300x100.png 300w, https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-7-768x256.png 768w, https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-7-50x17.png 50w, https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-7-60x20.png 60w, https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-7-100x33.png 100w, https:\/\/kb.mailfence.com\/wp-content\/uploads\/2024\/06\/image-7.png 1075w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\"><strong>Copiez<\/strong> les valeurs DMARC Name\/Host et record pour les ajouter \u00e0 votre nom de domaine, votre h\u00e9bergement ou votre fournisseur de services DNS.<\/figcaption><\/figure>\n<\/div>\n\n\n<p>2. Avant de cliquer sur valider :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>L&rsquo;entr\u00e9e DMARC sugg\u00e9r\u00e9e est un <em>rapport uniquement<\/em> (c&rsquo;est-\u00e0-dire que vous recevrez des rapports DMARC indiquant les tentatives d&rsquo;usurpation de vos adresses bas\u00e9es sur le domaine).\nAssurez-vous que vous avez remplac\u00e9 \u00ab\u00a0[YOUR-EMAIL-ADDRESS]\u00a0\u00bb par une <strong>adresse existante bas\u00e9e sur le nom de domaine que vous venez d&rsquo;ajouter<\/strong>.\nVous recevrez un rapport DMARC (par exemple, sur une base quotidienne) des serveurs de messagerie qui supportent l&rsquo;envoi de rapports DMARC agr\u00e9g\u00e9s.  \n<ul class=\"wp-block-list\">\n<li>Si l&rsquo;adresse \u00e9lectronique figurant dans la balise <strong>rua=mailto :<\/strong> n&rsquo;est pas bas\u00e9e sur un nom de domaine que vous venez d&rsquo;ajouter, <a href=\"https:\/\/dmarc.org\/2015\/08\/receiving-dmarc-reports-outside-your-domain\/\">une autorisation de rapport externe<\/a> sera n\u00e9cessaire.<\/li>\n\n\n\n<li>Vous pouvez <a href=\"https:\/\/kb.mailfence.com\/fr\/?post_type=ht_kb&amp;p=5646\">cesser de recevoir des rapports DMARC<\/a> \u00e0 tout moment.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Le param\u00e8tre <strong>\u00ab\u00a0p=\u00a0\u00bb<\/strong> sp\u00e9cifie l&rsquo;action \u00e0 entreprendre pour les mails qui \u00e9chouent \u00e0 DMARC et \u00a0\u00bb <em>none\u00a0\u00bb<\/em> signifie essentiellement qu&rsquo;il ne faut rien faire (si SPF et\/ou DKIM \u00e9chouent) et qu&rsquo;il faut suivre la politique de l&rsquo;exp\u00e9diteur. Les autres options sont la <em>mise en quarantaine<\/em> et le <em>rejet<\/em>. Assurez-vous de bien comprendre les <a href=\"https:\/\/en.wikipedia.org\/wiki\/DMARC#Compatibility\">risques li\u00e9s \u00e0 l&rsquo;acheminement de votre courrier \u00e9lectronique<\/a> avant d&rsquo;utiliser une politique autre que \u00a0\u00bb <em>none\u00a0\u00bb<\/em>.<\/li>\n\n\n\n<li>S&rsquo;il existe un enregistrement DNS TXT avec le nom\/h\u00f4te <strong>&lsquo;_dmarc&rsquo;<\/strong> pour votre domaine, modifiez cet enregistrement au lieu d&rsquo;en cr\u00e9er un nouveau.\nCeci est important car vous ne pouvez pas avoir plusieurs enregistrements DMARC pour un domaine donn\u00e9. <\/li>\n<\/ul>\n\n\n\n<p>3. Une fois que l&rsquo;enregistrement DNS TXT correspondant a \u00e9t\u00e9 inclus avec succ\u00e8s, cliquez sur <strong>V\u00e9rifier<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-ht-blocks-messages wp-block-hb-message wp-block-hb-message--withicon is-style-info\">La propagation des enregistrements DNS peut prendre un certain temps.\nVous pouvez utiliser <a href=\"\">cet outil<\/a> pour v\u00e9rifier. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-agent-de-transfert-de-courrier-securite-stricte-du-transport-mta-sts\"><strong>Agent de transfert de courrier &#8211; S\u00e9curit\u00e9 stricte du transport<\/strong> (<strong><strong>MTA-STS<\/strong><\/strong>)<\/h2>\n\n\n\n<p>Consultez <a href=\"https:\/\/blog.mailfence.com\/fr\/mailfence-continue-d-ameliorer-la-securite\/\">cet article de blog<\/a> pour en savoir plus sur la prise en charge par Mailfence de DANE et MTA-STS.<\/p>\n\n\n\n<p>Vous pouvez configurer MTA-STS pour votre nom de domaine (la politique MTA-STS de Mailfence est disponible <a href=\"https:\/\/mta-sts.mailfence.com\/.well-known\/mta-sts.txt\">ici<\/a>).\nSi vous n&rsquo;avez pas d&rsquo;h\u00e9bergement disponible pour votre domaine, vous pouvez utiliser une <a href=\"https:\/\/emailsecurity.blog\/hosting-your-mta-sts-policy-using-github-pages\">page Github<\/a>. <\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Obligatoire Vous n&rsquo;avez pas besoin d&rsquo;effectuer de modifications si vous utilisez uniquement des adresses bas\u00e9es sur le nom de domaine mailfence.com. Cependant, si vous avez ajout\u00e9 votre propre nom de domaine, vous devez configurer les entr\u00e9es DNS suivantes afin d&#8217;emp\u00eacher l&rsquo;usurpation d&rsquo;adresse \u00e9lectronique et d&rsquo;assurer la d\u00e9livrabilit\u00e9 : Table des&#8230;<\/p>\n","protected":false},"author":1,"comment_status":"closed","ping_status":"closed","template":"","format":"standard","meta":{"footnotes":""},"ht-kb-category":[1135],"ht-kb-tag":[],"class_list":["post-5576","ht_kb","type-ht_kb","status-publish","format-standard","hentry","ht_kb_category-domaine-personnalise"],"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>Comment mettre en place une d\u00e9fense anti-spoofing pour mon domaine ? - Mailfence Support<\/title>\n<meta name=\"description\" content=\"Mettez en place une d\u00e9fense anti-spoofing en ajoutant des enregistrements SPF, DKIM et DMARC afin 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