{"id":36574,"date":"2025-11-12T10:31:54","date_gmt":"2025-11-12T10:31:54","guid":{"rendered":"https:\/\/www.bancomail.com\/blog\/?p=36574"},"modified":"2026-03-19T10:40:14","modified_gmt":"2026-03-19T10:40:14","slug":"b2b-email-validierung-smtp-server","status":"publish","type":"post","link":"https:\/\/www.bancomail.com\/blog\/de\/b2b-email-validierung-smtp-server\/","title":{"rendered":"B2B E-Mail-Validierung: was passiert bei der Abfrage eines SMTP-Servers"},"content":{"rendered":"\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u201eJa, hallo?\u201c \u2013 und wer ist dran?<\/p>\n<\/blockquote>\n\n\n\n<p>In den letzten Monaten war eine unserer gr\u00f6\u00dften technischen Herausforderungen die Entwicklung eines eigenen <strong><a href=\"https:\/\/www.bancomail.com\/blog\/de\/technologie-und-daten-das-kerngeschaft-von-bancomail\/\">E-Mail-Validators<\/a><\/strong>, um unsere Datenbank noch zuverl\u00e4ssiger zu machen.<\/p>\n\n\n\n<p>Nat\u00fcrlich haben wir E-Mails schon immer \u00fcberpr\u00fcft \u2013 B2B-Datenbanken ohne E-Mail-Validierung zu verkaufen, w\u00e4re fahrl\u00e4ssig und k\u00f6nnte K\u00e4ufer ernsthaft auf Blacklists bringen.<br>Also: immer sicherstellen, dass Adressen g\u00fcltig sind!<\/p>\n\n\n\n<p>Bisher nutzten wir bew\u00e4hrte Tools. Es gibt viele, einige davon ausgezeichnet, und wir hatten sogar gute Kooperationen mit mehreren Anbietern.<br>Doch in letzter Zeit sind uns kleine Inkonsistenzen aufgefallen \u2013 Grund genug, selbst aktiv zu werden und ein modernes, sicheres und pr\u00e4zises Tool zu entwickeln, das uns zuverl\u00e4ssige Antworten liefert.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>Ein solches Tool zu entwickeln bedeutet, sich wirklich <strong>die H\u00e4nde schmutzig zu machen<\/strong>.<br>Man kann nicht an der Oberfl\u00e4che bleiben \u2013 man muss tief in die Mechanik der Mailserver und Protokolle eintauchen, ohne dabei den \u00dcberblick zu verlieren.<\/p>\n\n\n\n<p>Im Kern der Validierung steht ein Dialog \u2013 das \u201eGespr\u00e4ch\u201c mit dem Empf\u00e4nger-Server.<br>Um diesen Prozess zu veranschaulichen, bedienen wir uns einer Analogie, die viele Deutsche sofort verstehen: der legend\u00e4re <em>\u201eJa, hallo?\u201c<\/em>-Moment aus der Kultserie <strong>Dittsche<\/strong>.<\/p>\n\n\n\n<p>Denn E-Mails zu pr\u00fcfen ist ein bisschen wie bei Dittsche anrufen:<br>Man ruft, wartet \u2013 manchmal bekommt man eine Antwort, manchmal nicht, und manchmal\u2026 ist die Antwort v\u00f6llig unerwartet.<\/p>\n\n\n\n<p>Und genau das macht unser E-Mail-Validator: Er \u201eklingelt\u201c bei den Domains, h\u00f6rt sich an, was zur\u00fcckkommt \u2013 und erkennt, wer (oder was) wirklich dahintersteckt.<\/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-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.bancomail.com\/blog\/de\/b2b-email-validierung-smtp-server\/#Fall_1_Fehlender_MX\" >Fall 1: Fehlender MX<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.bancomail.com\/blog\/de\/b2b-email-validierung-smtp-server\/#Fall_2_Temporare_Wegwerf-E-Mail\" >Fall 2: Tempor\u00e4re \/ Wegwerf-E-Mail<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.bancomail.com\/blog\/de\/b2b-email-validierung-smtp-server\/#Fall_3_Catch-All_Server_die_alles_akzeptieren\" >Fall 3: Catch-All (Server, die alles akzeptieren)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.bancomail.com\/blog\/de\/b2b-email-validierung-smtp-server\/#Fall_4_Greylisting\" >Fall 4: Greylisting<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.bancomail.com\/blog\/de\/b2b-email-validierung-smtp-server\/#Fall_5_Timeout\" >Fall 5: Timeout<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.bancomail.com\/blog\/de\/b2b-email-validierung-smtp-server\/#Fall_6_Absender_abgelehnt_Sender_Rejected\" >Fall 6: Absender abgelehnt (Sender Rejected)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.bancomail.com\/blog\/de\/b2b-email-validierung-smtp-server\/#Fall_7_SMTP_Rejected\" >Fall 7: SMTP Rejected<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.bancomail.com\/blog\/de\/b2b-email-validierung-smtp-server\/#Fall_8_Gultige_E-Mail\" >Fall 8: G\u00fcltige E-Mail<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.bancomail.com\/blog\/de\/b2b-email-validierung-smtp-server\/#Zusammengefasst\" >Zusammengefasst<\/a><\/li><\/ul><\/nav><\/div>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Fall_1_Fehlender_MX\"><\/span>Fall 1: Fehlender MX<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Du kommst ans Haus, willst klingeln \u2013 aber es gibt keinen Klingelknopf.<br>Vielleicht gab es mal einen, aber jetzt ist da nur ein Loch.<br>Du gehst weiter und nimmst dir vor, sp\u00e4ter noch mal vorbeizuschauen.<\/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=\"Fall_2_Temporare_Wegwerf-E-Mail\"><\/span>Fall 2: Tempor\u00e4re \/ Wegwerf-E-Mail<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Du rufst: \u201eIst Olaf da?\u201c<br>Eine metallische Stimme antwortet: \u201eJa, hallo!\u201c<br>Du bist nicht \u00fcberzeugt. Du gehst \u2013 und notierst dir die Adresse, nur f\u00fcr den Fall.<\/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=\"Fall_3_Catch-All_Server_die_alles_akzeptieren\"><\/span>Fall 3: Catch-All (Server, die alles akzeptieren)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Du rufst: \u201eIst Olaf da?\u201c \u2013 \u201eJa, hallo!\u201c<br>\u201eUnd Sabine?\u201c \u2013 \u201eJa, hallo!\u201c<br>\u201eUnd die B\u00e4ckerei um die Ecke?\u201c \u2013 \u201eJa, hallo!\u201c<br>Du lachst \u2013 wer immer \u201eJa, hallo!\u201c sagt, meint es wahrscheinlich nicht ernst.<\/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=\"Fall_4_Greylisting\"><\/span>Fall 4: Greylisting<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u201eIst Olaf da?\u201c<br>\u2013 \u201eIch wei\u00df nicht\u2026 ruf sp\u00e4ter noch mal an.\u201c<br>Du rufst 15 Minuten sp\u00e4ter wieder an, hoffend, dass Olaf inzwischen aufgetaucht ist.<\/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=\"Fall_5_Timeout\"><\/span>Fall 5: Timeout<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Du rufst. Schweigen.<br>Vielleicht schlafen sie, vielleicht ist die Leitung tot, vielleicht ist der Klingelknopf nur Deko.<br>Du versuchst es ein andermal.<\/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=\"Fall_6_Absender_abgelehnt_Sender_Rejected\"><\/span>Fall 6: Absender abgelehnt (Sender Rejected)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Du meldest dich: \u201eHallo, hier ist Andrea von Bancomail\u2026\u201c<br>\u2013 \u201eNein danke, kein Interesse!\u201c<br>Gespr\u00e4ch beendet. Vielleicht versuchst du es irgendwann noch mal \u2013 unter einem anderen Namen.<\/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=\"Fall_7_SMTP_Rejected\"><\/span>Fall 7: SMTP Rejected<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u201eIst Olaf da?\u201c<br>\u2013 \u201eOlaf wer?\u201c<br>\u201eOlaf Schmidt\u2026\u201c<br>\u2013 \u201eNie geh\u00f6rt.\u201c<br>Ein bisschen schade \u2013 aber immerhin ehrlich.<\/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=\"Fall_8_Gultige_E-Mail\"><\/span>Fall 8: G\u00fcltige E-Mail<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Du rufst: \u201eIst Sabine da?\u201c<br>\u2013 \u201eJa, hier ist Sabine!\u201c<br>Ehrlich und direkt. Du hattest vorher auch nach Olaf gefragt, und man antwortete: \u201eOlaf wer?\u201c<br>Du legst auf mit einem L\u00e4cheln \u2013 endlich eine echte Antwort.<\/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=\"Zusammengefasst\"><\/span>Zusammengefasst<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>E-Mails zu validieren ist im Grunde ein digitaler Rundgang durchs Klingelhaus:<br>Einige sind nicht da, manche tun so, als w\u00e4ren sie da, andere z\u00f6gern \u2013 und ein paar antworten tats\u00e4chlich.<\/p>\n\n\n\n<p>Wir machen das tausendfach am Tag: h\u00f6flich, p\u00fcnktlich, mit einem Algorithmus, der keinen Fehler macht.<\/p>\n\n\n\n<p>Denn selbst in der digitalen Welt gilt die alte Hausregel:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>Wenn keiner aufmacht, besser nicht noch mal klingeln.<br>Und wenn alle zu schnell aufmachen \u2013 vielleicht besser drau\u00dfen bleiben.<\/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>Danke, dass Sie bis hierhin gelesen haben \u2013 wir wollten zeigen, dass auch ein technisches Thema ein L\u00e4cheln verdient.<br>Und ein kleiner Gru\u00df an <strong>Dittsche<\/strong> \u2013 den Mann, der jedes Gespr\u00e4ch mit einem \u201eJa, hallo?\u201c beginnt.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>E-Mail-Verifizierung bedeutet, Mailserver des Empf\u00e4ngers abzufragen und SMTP-Antworten auszuwerten, um g\u00fcltige, ung\u00fcltige oder riskante Adressen (Catch-all, Disposable, Greylisting) zu erkennen. Bancomail f\u00fchrt diese Pr\u00fcfungen t\u00e4glich in gro\u00dfem Ma\u00dfstab durch und filtert F\u00e4lle wie fehlende MX-Eintr\u00e4ge oder Sender-Rejection, um Bounces und Blacklist-Risiken zu reduzieren. Wenn ein Server nicht antwortet oder alles akzeptiert, sind die Daten unzuverl\u00e4ssig.<\/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":[1257],"tags":[7996,8009,7998,8012,8002,8015,8018,8004,8001],"post_template":[],"top_category":[],"class_list":["post-36574","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-deliverability-e-mail-marketing-sicherheit-und-zustellbarkeit","tag-b2b-email-database","tag-bancomail-email-validator-de","tag-data-accuracy-b2b","tag-email-deliverability-de","tag-email-list-cleaning","tag-email-validation-de","tag-email-verifier-de","tag-smtp-check","tag-verified-b2b-leads"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>B2B E-Mail-Validierung: was passiert bei der Abfrage eines SMTP-Servers - 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\/de\/b2b-email-validierung-smtp-server\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"B2B E-Mail-Validierung: was passiert bei der Abfrage eines SMTP-Servers - Bancomail Blog\" \/>\n<meta property=\"og:description\" content=\"E-Mail-Verifizierung bedeutet, Mailserver des Empf\u00e4ngers abzufragen und SMTP-Antworten auszuwerten, um g\u00fcltige, ung\u00fcltige oder riskante Adressen (Catch-all, Disposable, Greylisting) zu erkennen. 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