{"id":36570,"date":"2025-11-12T10:23:24","date_gmt":"2025-11-12T10:23:24","guid":{"rendered":"https:\/\/www.bancomail.com\/blog\/?p=36570"},"modified":"2026-03-19T10:25:07","modified_gmt":"2026-03-19T10:25:07","slug":"validation-email-b2b-serveur-smtp","status":"publish","type":"post","link":"https:\/\/www.bancomail.com\/blog\/fr\/validation-email-b2b-serveur-smtp\/","title":{"rendered":"Validation d\u2019emails B2B : que se passe-t-il lorsqu\u2019on interroge un serveur SMTP"},"content":{"rendered":"\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>C\u2019est comme sonner \u00e0 l\u2019interphone : y a-t-il Juste Leblanc ?<\/p>\n<\/blockquote>\n\n\n\n<p>Ces derniers mois, l\u2019un des d\u00e9fis techniques les plus cors\u00e9s que nous avons relev\u00e9s a \u00e9t\u00e9 de cr\u00e9er notre propre <strong>Validateur d\u2019e-mails<\/strong>, histoire de rendre notre base de donn\u00e9es toujours plus fiable. Bien s\u00fbr, nous v\u00e9rifions les adresses depuis longtemps (vendre des bases de donn\u00e9es B2B sans validation des adresses e-mail est un acte imprudent qui expose les acheteurs \u00e0 de s\u00e9rieux probl\u00e8mes de blacklisting : assurez-vous toujours que les adresses sont valides).<br>Jusqu\u2019ici, nous utilisions des outils fiables d\u00e9j\u00e0 existants. Il y en a pas mal, certains tr\u00e8s performants, et nous avions m\u00eame nou\u00e9 de bonnes collaborations avec plusieurs d\u2019entre eux.<\/p>\n\n\n\n<p>Mais derni\u00e8rement, nous avons remarqu\u00e9 certaines incoh\u00e9rences et inexactitudes qui nous ont amen\u00e9s \u00e0 faire un effort intellectuel (et financier) pour d\u00e9velopper un <strong>outil moderne, s\u00fbr et fonctionnel<\/strong> capable de nous fournir des r\u00e9ponses solides et fiables.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>Pour d\u00e9velopper un outil comme celui-ci, il faut <strong>mettre les mains dans le cambouis<\/strong>.<br>Pas question de rester en surface : il faut explorer les m\u00e9canismes complexes des serveurs et protocoles mail. Et sans se perdre !<br>Au c\u0153ur de la validation, il y a ce fameux <strong>dialogue avec le serveur du destinataire<\/strong>. Pour l\u2019expliquer simplement, nous avons utilis\u00e9 une all\u00e9gorie simple : l\u2019interphone.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>Parce que v\u00e9rifier un e-mail, c&#8217;est un peu comme sonner \u00e0 l&#8217;interphone.<br>Vous essayez, puis vous voyez ce qui se passe.<br>Parfois, on vous ouvre, parfois personne ne r\u00e9pond. Et parfois, on vous r\u00e9pond d&#8217;une mani\u00e8re bizarre.<\/p>\n<\/blockquote>\n\n\n\n<p>Et c\u2019est exactement ce que fait notre Validateur Email : il \u201csonne\u201d chez les domaines et, selon la r\u00e9ponse, il comprend ce qui se cache derri\u00e8re l\u2019adresse.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_76 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\"><\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.bancomail.com\/blog\/fr\/validation-email-b2b-serveur-smtp\/#Cas_n%C2%B01_MX_manquant\" >Cas n\u00b01 : MX manquant<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.bancomail.com\/blog\/fr\/validation-email-b2b-serveur-smtp\/#Cas_n%C2%B02_Email_temporaire_jetable_provisoire\" >Cas n\u00b02 : Email temporaire (jetable, provisoire)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.bancomail.com\/blog\/fr\/validation-email-b2b-serveur-smtp\/#Cas_n%C2%B03_Catch-all_serveurs_qui_acceptent_tout\" >Cas n\u00b03 : Catch-all (serveurs qui acceptent tout)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.bancomail.com\/blog\/fr\/validation-email-b2b-serveur-smtp\/#Cas_n%C2%B04_Greylisting\" >Cas n\u00b04 : Greylisting<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.bancomail.com\/blog\/fr\/validation-email-b2b-serveur-smtp\/#Cas_n%C2%B05_Timeout\" >Cas n\u00b05 : Timeout<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.bancomail.com\/blog\/fr\/validation-email-b2b-serveur-smtp\/#Cas_n%C2%B06_Sender_rejected\" >Cas n\u00b06 : Sender rejected<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.bancomail.com\/blog\/fr\/validation-email-b2b-serveur-smtp\/#Cas_n%C2%B07_SMTP_rejected\" >Cas n\u00b07 : SMTP rejected<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.bancomail.com\/blog\/fr\/validation-email-b2b-serveur-smtp\/#Cas_n%C2%B08_Email_valide\" >Cas n\u00b08 : Email valide<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.bancomail.com\/blog\/fr\/validation-email-b2b-serveur-smtp\/#En_resume\" >En r\u00e9sum\u00e9<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cas_n%C2%B01_MX_manquant\"><\/span><strong>Cas n\u00b01 <\/strong>: <strong>MX manquant<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Vous arrivez devant l\u2019immeuble, pr\u00eat \u00e0 sonner\u2026 mais il n\u2019y a pas d\u2019interphone !<br>Peut-\u00eatre qu\u2019il y en avait un avant, mais l\u00e0, rien.<br>Vous repartez en vous promettant de revenir un jour pour voir s\u2019ils l\u2019ont r\u00e9install\u00e9.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cas_n%C2%B02_Email_temporaire_jetable_provisoire\"><\/span><strong>Cas n\u00b02 <\/strong>: Email temporaire (jetable, provisoire)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Vous sonnez et demandez \u00ab Est-ce que c\u2019est Juste Leblanc ? \u00bb<br>Une voix robotique vous r\u00e9pond : \u00ab Oui, bien s\u00fbr ! \u00bb<br>Vous n\u2019\u00eates pas convaincu et repartez, probablement pour ne jamais revenir\u2026 mais vous notez quand m\u00eame l\u2019adresse.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe title=\"Juste Leblanc | &quot;Le diner de cons&quot;\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/n5_ruQ8okms?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cas_n%C2%B03_Catch-all_serveurs_qui_acceptent_tout\"><\/span><strong>Cas n\u00b03 <\/strong>: Catch-all (serveurs qui acceptent tout)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Vous sonnez : \u00ab Est-ce que Juste Leblanc habite ici ? \u00bb<br>\u2013 \u00ab Oui, c\u2019est Juste ! \u00bb<br>Vous continuez : \u00ab Et Pierre Brochant ? \u00bb<br>\u2013 \u00ab Oui, lui aussi ! \u00bb<br>\u00ab Et Marl\u00e8ne Sasseur ? \u00bb<br>\u2013 \u00ab Oui, elle aussi ! \u00bb<br>Vous souriez et repartez : s\u2019ils disent oui pour tout le monde, c\u2019est qu\u2019ils mentent\u2026 pour le plaisir.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cas_n%C2%B04_Greylisting\"><\/span><strong>Cas n\u00b04 <\/strong>: Greylisting<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u00ab C&#8217;est Juste ? \u00bb<br>\u2013 \u00ab Je ne sais pas, je v\u00e9rifie\u2026 revenez dans 15 minutes. \u00bb<br>Vous revenez 15 minutes plus tard, en esp\u00e9rant que Juste se soit manifest\u00e9 entre-temps.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cas_n%C2%B05_Timeout\"><\/span><strong>Cas n\u00b05 <\/strong>: Timeout<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Vous sonnez. Silence.<br>Peut-\u00eatre qu\u2019ils dorment, que la ligne est coup\u00e9e, ou que l\u2019interphone est en panne.<br>Vous reviendrez un autre jour pour v\u00e9rifier.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cas_n%C2%B06_Sender_rejected\"><\/span><strong>Cas n\u00b06 <\/strong>: Sender rejected<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Vous sonnez et vous vous pr\u00e9sentez : \u00ab Bonjour, c\u2019est Andrea de Bancomail et\u2026 \u00bb<br>On vous coupe : \u00ab Non merci, j\u2019ai pas besoin ! \u00bb<br>Vous pensez au vendeur de robots de cuisine qui passe parfois chez vous.<br>Fin de la conversation. Peut-\u00eatre qu\u2019un jour vous reviendrez, mais sous un autre nom.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cas_n%C2%B07_SMTP_rejected\"><\/span><strong>Cas n\u00b07 <\/strong>: SMTP rejected<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Vous sonnez : \u00ab C\u2019est Juste ? \u00bb<br>\u2013 \u00ab Juste qui ? \u00bb<br>\u00ab Juste Leblanc\u2026 \u00bb<br>\u2013 \u00ab Jamais entendu parler. \u00bb<br>\u00ab Bizarre, il habitait ici avant\u2026 \u00bb<br>\u2013 \u00ab Peut-\u00eatre, mais maintenant il n\u2019est plus l\u00e0. \u00bb<br>Vous \u00eates un peu d\u00e9sol\u00e9 pour Juste, mais au moins, ils ont \u00e9t\u00e9 honn\u00eates.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cas_n%C2%B08_Email_valide\"><\/span><strong>Cas n\u00b08 <\/strong>: Email valide<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Vous sonnez : \u00ab C\u2019est ici chez Pierre ? \u00bb<br>\u2013 \u00ab Oui, c\u2019est ici ! \u00bb<br>On vous ouvre vraiment et Pierre Brochant se montre en personne.<br>Ils ont \u00e9t\u00e9 sinc\u00e8res : vous aviez demand\u00e9 aussi Juste, et on vous a r\u00e9pondu : \u00ab Juste quoi ? \u00bb<br>Vous repartez sans vous retourner, mais le c\u0153ur l\u00e9ger.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"En_resume\"><\/span>En r\u00e9sum\u00e9<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>V\u00e9rifier des e-mails, en fin de compte, c\u2019est un peu \u00e7a :<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>Un tour d\u2019interphones num\u00e9riques entre ceux qui ne sont pas l\u00e0, ceux qui font semblant, ceux qui ont peur, ceux qui ne savent pas\u2026 et ceux qui, miraculeusement, r\u00e9pondent.<\/p>\n<\/blockquote>\n\n\n\n<p>Nous le faisons des milliers de fois par jour, avec un certain style : polis, ponctuels, et avec un algorithme qui ne se trompe jamais.<br>Parce que m\u00eame dans le monde digital, la r\u00e8gle de base du syndicat de copropri\u00e9t\u00e9 reste valable :<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>Si personne ne vous ouvre, mieux vaut ne pas insister.<br>Mais si on vous ouvre trop vite\u2026 peut-\u00eatre vaut-il mieux rester prudent.<\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>PS:<\/strong><br>Merci \u00e0 ceux qui ont lu cet article jusqu\u2019au bout, avec l\u2019ambition de faire sourire dans un domaine d\u2019habitude s\u00e9rieux.<br>Et merci \u00e0 Pierre Brochant et Fran\u00e7ois Pignon pour l\u2019appel m\u00e9morable \u00e0 Juste Leblanc.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>V\u00e9rifier un email consiste \u00e0 interroger les serveurs du domaine et analyser les r\u00e9ponses SMTP pour distinguer adresses valides, inexistantes ou \u00e0 risque (catch-all, disposable, greylisting). Bancomail effectue ces contr\u00f4les \u00e0 grande \u00e9chelle chaque jour, en filtrant des cas comme MX manquant ou rejet exp\u00e9diteur pour r\u00e9duire les rebonds et le risque de blacklist. Si un serveur ne r\u00e9pond pas ou accepte tout, la donn\u00e9e n\u2019est pas fiable.<\/p>\n","protected":false},"author":6,"featured_media":36565,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1253],"tags":[7971,4862,7958,7962,7964,7963,7959,7956,7954,7957],"post_template":[],"top_category":[],"class_list":["post-36570","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-delivrabilite-des-e-mails","tag-bancomail-fr","tag-base-de-donnees-b2b","tag-deliverability-b2b","tag-email-validator","tag-nettoyage-base-email","tag-outils-de-verification-email","tag-qualite-des-donnees-marketing","tag-securite-email-marketing","tag-validation-smtp","tag-verification-dadresses-email"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Validation d\u2019emails B2B : que se passe-t-il lorsqu\u2019on interroge un serveur SMTP - Bancomail Blog<\/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.bancomail.com\/blog\/fr\/validation-email-b2b-serveur-smtp\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Validation d\u2019emails B2B : que se passe-t-il lorsqu\u2019on interroge un serveur SMTP - Bancomail Blog\" \/>\n<meta property=\"og:description\" content=\"V\u00e9rifier un email consiste \u00e0 interroger les serveurs du domaine et analyser les r\u00e9ponses SMTP pour distinguer adresses valides, inexistantes ou \u00e0 risque (catch-all, disposable, greylisting). 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