{"id":1774,"date":"2018-09-11T15:50:05","date_gmt":"2018-09-11T14:50:05","guid":{"rendered":"https:\/\/michauko.org\/blog\/?p=1774"},"modified":"2020-12-07T14:41:21","modified_gmt":"2020-12-07T13:41:21","slug":"mailman-et-dmarc","status":"publish","type":"post","link":"https:\/\/michauko.org\/blog\/mailman-et-dmarc-1774\/","title":{"rendered":"mailman et DMARC"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Hop, petit pense-b\u00eate. Je viens r\u00e9cemment de prendre des retours de mails envoy\u00e9 depuis un compte @yahoo vers une mailing-list sur l&rsquo;outil mailman (appelons-la liste@autre_domaine.fr) qui contenait des adresses notamment chez gmail.<br>\nBilan, gmail les rejette au motif de :<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">Sep 11 05:45:32 mon_host postfix\/smtp[8866]: 04746A1558: to=<une.boite.mail@gmail.com>, relay=gmail-smtp-in.l.google.com[64.233.184.27]:25, delay=31, delays=0.01\/0\/30\/0.71, dsn=5.7.1, status=bounced (host gmail-smtp-in.l.google.com[64.233.184.27] said: 550-5.7.1 Unauthenticated email from yahoo.fr is not accepted due to domain's 550-5.7.1 DMARC policy. Please contact the administrator of yahoo.fr domain if 550-5.7.1 this was a legitimate mail. Please visit 550-5.7.1  https:\/\/support.google.com\/mail\/answer\/2451690 to learn about the 550 5.7.1 DMARC initiative. o16-v6si1277580wmh.19 - gsmtp (in reply to end of DATA command))<\/une.boite.mail@gmail.com><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Ce gentil baratin m&rsquo;a men\u00e9 vers <a href=\"https:\/\/wiki.list.org\/DEV\/DMARC\" rel=\"noopener noreferrer\" target=\"_blank\">https:\/\/wiki.list.org\/DEV\/DMARC<\/a> qui explique (et \u00e7a ne doit pas dater d&rsquo;hier pourtant) que le contr\u00f4le DMARC sur les serveurs autoris\u00e9s \u00e0 exp\u00e9dier au nom d&rsquo;un serveur donn\u00e9 (yahoo ici) a mis la mis\u00e8re aux outils de mailing-list car l&rsquo;exp\u00e9diteur est par exemple yahoo et c&rsquo;est un serveur qui n&rsquo;est pas yahoo qui relaye (@autre_domaine.fr dans mon exemple). Donc gmail, qui contr\u00f4le le DMARC, bloque.<\/p>\n\n\n\n<!--more-->\n\n\n\n<p class=\"wp-block-paragraph\">Bilan, depuis les versions 2.1 (en debian stable \u00ab\u00a0stretch\u00a0\u00bb) et 3.1 (plus tard ? ;)), ils ont trouv\u00e9 comme solution globalement satisfaisante de faire de la r\u00e9\u00e9criture du champ From afin que l&rsquo;exp\u00e9diteur soit bien @liste@autre_domaine.fr, exp\u00e9di\u00e9e par le serveur de autre_domaine.fr, donc l\u00e9gitime etc. Et pouf, les mails arrivent. Le champ Reply-To est mis \u00e0 la valeur de l&rsquo;exp\u00e9diteur (yahoo) afin de permettre le retour (surtout si l&rsquo;exp\u00e9diteur n&rsquo;est pas dans la liste, il n&rsquo;aurait pas la r\u00e9ponse).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ce n&rsquo;est pas activ\u00e9 par d\u00e9faut, il faut aller dans l&rsquo;\u00e9diteur web de conf mailman, dans la partie <code>\/mailman\/admin\/ \t<liste>\/privacy\/sender<\/liste><\/code> et positionner le param\u00e8tre dmarc_moderation_action \u00e0 \u00ab\u00a0Munge\u00a0\u00bb (rewrite) si on veut ce comportement.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A noter que, \u00e0 moins de cocher dmarc_none_moderation_action, mailman est intelligent et teste le comportement des serveurs en terme de DMARC et s&rsquo;il sait qu&rsquo;un mail va se faire rejeter, alors il fait la r\u00e9\u00e9criture, pas pour les autres. On voit d&rsquo;ailleurs dans les logs partir 2 salves de mails : les r\u00e9\u00e9crits et les non r\u00e9\u00e9crits (gmail.com, outlook.com &#8230;)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C&rsquo;est \u00e0 faire obligatoirement, \u00e0 mon sens, sans quoi vos listes sont HS.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Hop, petit pense-b\u00eate. Je viens r\u00e9cemment de prendre des retours de mails envoy\u00e9 depuis un compte @yahoo vers une mailing-list sur l&rsquo;outil mailman (appelons-la liste@autre_domaine.fr) qui contenait des adresses notamment chez gmail. Bilan, gmail les &hellip;<\/p>\n","protected":false},"author":2,"featured_media":1835,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_crdt_document":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[385],"tags":[595,497],"class_list":["post-1774","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mails","tag-dmarc","tag-mailman"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>mailman et DMARC - Le blog de Michauko<\/title>\n<meta name=\"description\" content=\"mailman et DMARC : comment faire en sorte que certains exp\u00e9diteurs ext\u00e9rieurs \u00e0 une liste ne soient pas bloqu\u00e9s par certains destinataires de la liste du fait du protocole DMARC\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/michauko.org\/blog\/mailman-et-dmarc-1774\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"mailman et DMARC - 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