{"id":18422,"date":"2020-09-24T15:37:25","date_gmt":"2020-09-24T13:37:25","guid":{"rendered":"https:\/\/test-blog.mailfence.com\/?p=18422"},"modified":"2024-11-14T10:53:27","modified_gmt":"2024-11-14T09:53:27","slug":"strategie-dmarc-mailfence","status":"publish","type":"post","link":"https:\/\/blog.mailfence.com\/fr\/strategie-dmarc-mailfence\/","title":{"rendered":"La politique DMARC et sa mise en \u0153uvre par Mailfence."},"content":{"rendered":"\n
\n

Nous avons pris de nombreuses mesures pour prot\u00e9ger nos utilisateurs contre l’usurpation d’identit\u00e9 ou le phishing<\/a>. Toutefois, ce type d’e-mails peut toujours se retrouver dans votre bo\u00eete de r\u00e9ception. Bien que nous ayons mis en place des protections <\/a>conventionnelles <\/a>et d’autres <\/a>mesures<\/a>, elles ne sont pas toujours suffisantes. Nous avons donc d\u00e9cid\u00e9 d’appliquer la politique DMARC. Ci-dessous, vous en apprendrez davantage sur la strat\u00e9gie de Mailfence pour l’application de DMARC.<\/p>\n\n\n\n\n\n\n

Qu’est-ce que la DMARC ?<\/h2>\n\n\n\n

L’acronyme DMARC d\u00e9signe \u00ab\u00a0Domain-based Message Authentication, Reporting & Conformance\u00a0\u00bb. Cette sp\u00e9cification technique permet aux exp\u00e9diteurs de d\u00e9finir par une politique ce que le destinataire doit faire en cas d’\u00e9chec auxc contr\u00f4les SPF et\/ou DKIM. La DMARC v\u00e9rifie \u00e9galement si le champ Header-FROM<\/code>des messages est align\u00e9<\/a> avec les contr\u00f4les SPF et DKIM. Les propri\u00e9taires de domaines peuvent \u00e9galement recevoir des rapports agr\u00e9g\u00e9s et\/ou des rapports d’expertise du service du destinataire, qui consistent en un r\u00e9sum\u00e9 des r\u00e9sultats du DMARC pour leur domaine. Ainsi donc, les propri\u00e9taires de domaine peuvent apporter les modifications n\u00e9cessaires pour que les messages des exp\u00e9diteurs l\u00e9gitimes puissent passer, ou de voir d’o\u00f9 peuvent provenir les courriels malveillants.<\/p>\n\n\n\n

Lorsque la DMARC \u00e9choue, en fonction de la politique du domaine d’envoi, par cons\u00e9quent le message est mis en quarantaine (spam) ou rejet\u00e9. Notamment si la DMARC est appliqu\u00e9e par le destinataire, les utilisateurs peuvent \u00eatre prot\u00e9g\u00e9s contre le phishing, l’usurpation d’identit\u00e9 et d’autres types d’emails ind\u00e9sirables.<\/p>\n\n\n\n

Mailfence applique d\u00e9sormais la politique DMARC des exp\u00e9diteurs<\/h2>\n\n\n\n

Nous voulons nous assurer que les utilisateurs de Mailfence peuvent \u00e9galement profiter des avantages de DMARC. Ainsi, nous avons d\u00e9cid\u00e9 de commencer \u00e0 appliquer sa politique aux exp\u00e9diteurs.<\/p>\n\n\n\n

Pourquoi Mailfence n’appliquait pas la DMARC jusqu’ici ?<\/h4>\n\n\n\n

Pour plusieurs raisons. Tout d’abord, la mise en place de la politique DMARC (avec les contr\u00f4les SPF et DKIM) a \u00e9t\u00e9 lente. Deuxi\u00e8mement, un grand nombre de domaines avaient opt\u00e9 pour le mode de surveillance (p=none) et n’\u00e9taient pas encore pass\u00e9s \u00e0 une politique DMARC op\u00e9rationnelle. Troisi\u00e8mement, pour \u00e9viter de perdre des \u00e9mails l\u00e9gitimes rejet\u00e9s par la DMARC. Plus pr\u00e9cis\u00e9ment, en raison d’une erreur de mise en \u0153uvre du c\u00f4t\u00e9 de l’\u00e9diteur. Ou m\u00eame parce qu’ils proviennent d’une liste de diffusion.<\/p>\n\n\n\n

Qu’arrivera-t-il exactement aux emails que je re\u00e7ois ?<\/h4>\n\n\n\n

Si la v\u00e9rification de DMARC \u00e9choue, le message sera plac\u00e9 dans votre dossier de courrier ind\u00e9sirable. Actuellement, nous ne refusons pas les emails \u00e9chouant au contr\u00f4le DMARC si la proc\u00e9dure en cas d’\u00e9chec du domaine de l’exp\u00e9diteur est \u00ab\u00a0reject\u00a0\u00bb. Nous proc\u00e9dons ainsi pour compenser d’\u00e9ventuelles erreurs de mise en \u0153uvre (du c\u00f4t\u00e9 de l’exp\u00e9diteur).
Nous changerons cela lorsque nous verrons de moins en moins d’exp\u00e9diteurs en \u00e9chec DMARC en raison d’erreurs de mise en \u0153uvre.<\/p>\n\n\n\n

Que se passe-t-il si je mets sur liste blanche l’adresse d’un exp\u00e9diteur ?<\/h4>\n\n\n\n

L’email d’un exp\u00e9diteur figurant sur votre liste blanche ayant \u00e9chou\u00e9 au contr\u00f4le de DMARC arrivera dans votre bo\u00eete de r\u00e9ception. Dans ce cas, soyez conscient du risque possible de recevoir des emails malveillants ayant \u00e9chou\u00e9 au contr\u00f4le de DMARC.<\/strong><\/p>\n\n\n\n

La politique DMARC de Mailfence<\/h2>\n\n\n\n

Mailfence a d\u00e9fini sa propre politique DMARC comme une \u00ab\u00a0quarantaine\u00a0\u00bb. Cela signifie qu’en cas d’\u00e9chec au contr\u00f4le DMARC, les serveurs de messagerie c\u00f4t\u00e9 destinataire devront placer l’email dans son dossier de spam. Cela permet de r\u00e9duire plusieurs formes d’attaques bas\u00e9es sur l’usurpation d’identit\u00e9. De m\u00eame, cela contribue \u00e9galement \u00e0 maintenir la r\u00e9putation de notre nom de domaine.<\/p>\n\n\n\n

Nous aurions pu d\u00e9finir une politique de \u00ab\u00a0rejet\u00a0\u00bb. Toutefois, cela aurait pu avoir un impact n\u00e9gatif sur la transmission d’emails l\u00e9gitimes. Par exemple, un message peut \u00e9chouer \u00e0 la DMARC s’il est envoy\u00e9 \u00e0 une liste de diffusion, envoy\u00e9 \u00e0 plusieurs personnes. Cela devrait changer \u00e0 l’avenir, avec l’adoption de DMARC renforc\u00e9e par la norme DKIM<\/a>, ainsi que du syst\u00e8me d’authentification ARC <\/a>(lien en anglais).<\/p>\n\n\n\n

Nous invitons \u00e9galement les propri\u00e9taires de domaines personnalis\u00e9s<\/a> \u00e0 adopter la politique DMARC pour leur domaine.<\/p>\n\n\n\n

N’h\u00e9sitez pas \u00e0 nous faire part de vos commentaires. Pour en savoir plus sur Mailfence, consultez notre page de presse.<\/a><\/p>\n\n\n\n

Nous vous remercions pour votre soutien.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Nous avons pris de nombreuses mesures pour prot\u00e9ger nos utilisateurs contre l’usurpation d’identit\u00e9 ou le phishing. Toutefois, ce type d’e-mails peut toujours se retrouver dans votre bo\u00eete de r\u00e9ception. Bien que nous ayons mis en place des protections conventionnelles et d’autres mesures, elles ne sont pas toujours suffisantes. Nous avons donc d\u00e9cid\u00e9 d’appliquer la politique […]<\/p>\n","protected":false},"author":3,"featured_media":85578,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18591,27],"tags":[],"class_list":["post-18422","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mailfence-news","category-securite"],"yoast_head":"\nLa politique DMARC et sa mise en \u0153uvre par Mailfence. | Mailfence Blog<\/title>\n<meta name=\"description\" content=\"D\u00e9couvrez l'influence de la politique DMARC appliqu\u00e9e sur la r\u00e9ception de vos emails par Mailfence et comment elle am\u00e9liore votre s\u00e9curit\u00e9.\" \/>\n<meta name=\"robots\" content=\"noindex, follow\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"La politique DMARC et sa mise en \u0153uvre par 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