{"id":7347,"date":"2026-02-17T20:19:52","date_gmt":"2026-02-17T20:19:52","guid":{"rendered":"https:\/\/itexperte24.de\/?p=7347"},"modified":"2026-02-17T22:15:44","modified_gmt":"2026-02-17T22:15:44","slug":"smtp-basic-auth-microsoft-365","status":"publish","type":"post","link":"https:\/\/itexperte24.de\/en\/smtp-basic-auth-microsoft-365\/","title":{"rendered":"SMTP Basic Auth Microsoft 365"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"7347\" class=\"elementor elementor-7347\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9a5c4f6 e-flex e-con-boxed e-con e-parent\" data-id=\"9a5c4f6\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-aa3b193 elementor-widget elementor-widget-heading\" data-id=\"aa3b193\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">SMTP Basic Auth wird abgeschaltet \u2013 \nSMTP Basic Auth Microsoft 365 wird abgeschaltet \u2013 L\u00f6sungen f\u00fcr Legacy Ger\u00e4te ohne OAuth\n<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-131c939 elementor-widget elementor-widget-heading\" data-id=\"131c939\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<span class=\"elementor-heading-title elementor-size-default\">Stand: Februar 2026<\/span>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5b8ac18 elementor-widget elementor-widget-text-editor\" data-id=\"5b8ac18\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"557\" data-end=\"982\">Die Abschaltung von <strong data-start=\"577\" data-end=\"610\">SMTP Basic Auth Microsoft 365<\/strong> stellt viele Unternehmen vor technische Herausforderungen. Microsoft beendet schrittweise die Unterst\u00fctzung der klassischen SMTP-Authentifizierung in Exchange Online. F\u00fcr zahlreiche Ger\u00e4te und Systeme bedeutet das eine tiefgreifende Ver\u00e4nderung der bestehenden IT-Infrastruktur, da sie weiterhin auf Benutzername und Passwort zur E-Mail-Authentifizierung angewiesen sind.<\/p>\n<p data-start=\"984\" data-end=\"1191\">Besonders betroffen sind sogenannte Legacy Ger\u00e4te ohne OAuth-Unterst\u00fctzung, darunter Multifunktionsdrucker, Scanner, NAS-Systeme, USV-Anlagen, Firewalls, Monitoring-Systeme oder \u00e4ltere ERP- und CRM-L\u00f6sungen.<\/p>\n<p data-start=\"1193\" data-end=\"1224\">In diesem Artikel erkl\u00e4ren wir:<\/p>\n<ul data-start=\"1226\" data-end=\"1446\">\n<li data-start=\"1226\" data-end=\"1283\">\n<p data-start=\"1228\" data-end=\"1283\">Warum SMTP Basic Auth Microsoft 365 abgeschaltet wird<\/p>\n<\/li>\n<li data-start=\"1284\" data-end=\"1324\">\n<p data-start=\"1286\" data-end=\"1324\">Welche Ger\u00e4te konkret betroffen sind<\/p>\n<\/li>\n<li data-start=\"1325\" data-end=\"1356\">\n<p data-start=\"1327\" data-end=\"1356\">Welche Alternativen es gibt<\/p>\n<\/li>\n<li data-start=\"1357\" data-end=\"1399\">\n<p data-start=\"1359\" data-end=\"1399\">Welche L\u00f6sung langfristig sinnvoll ist<\/p>\n<\/li>\n<li data-start=\"1400\" data-end=\"1446\">\n<p data-start=\"1402\" data-end=\"1446\">Wie die technische Umsetzung erfolgen kann<\/p>\n<\/li>\n<\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9c89267 elementor-widget elementor-widget-heading\" data-id=\"9c89267\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Warum wird SMTP Basic Auth in Microsoft 365 abgeschaltet und was bedeutet das f\u00fcr Unternehmen?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-78eafd3 elementor-widget elementor-widget-text-editor\" data-id=\"78eafd3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"1197\" data-end=\"1478\">Basic Authentication gilt aus sicherheitstechnischer Sicht als veraltet. Benutzername und Passwort werden direkt zur Authentifizierung verwendet, ohne moderne Sicherheitsmechanismen wie Multi-Faktor-Authentifizierung (MFA), Conditional Access oder Token-basierte Zugriffskontrolle.<\/p><p data-start=\"1480\" data-end=\"1619\">Microsoft verfolgt daher konsequent die Strategie \u201eModern Authentication Only\u201c. Die offizielle Ank\u00fcndigung zur Abschaltung finden Sie hier:<\/p><p data-start=\"1621\" data-end=\"1822\">Microsoft \u2013 Deprecation of Basic Authentication in Exchange Online<br data-start=\"1687\" data-end=\"1690\" \/><a class=\"decorated-link\" href=\"https:\/\/learn.microsoft.com\/en-us\/exchange\/clients-and-mobile-in-exchange-online\/deprecation-of-basic-authentication-exchange-online\" target=\"_new\" rel=\"noopener\" data-start=\"1690\" data-end=\"1822\">https:\/\/learn.microsoft.com\/en-us\/exchange\/clients-and-mobile-in-exchange-online\/deprecation-of-basic-authentication-exchange-online<\/a><\/p><p data-start=\"1824\" data-end=\"1851\">Ziele der Abschaltung sind:<\/p><ul data-start=\"1853\" data-end=\"2010\"><li data-start=\"1853\" data-end=\"1896\"><p data-start=\"1855\" data-end=\"1896\">Schutz vor Passwort-basierten Angriffen<\/p><\/li><li data-start=\"1897\" data-end=\"1938\"><p data-start=\"1899\" data-end=\"1938\">Reduzierung von Brute-Force-Versuchen<\/p><\/li><li data-start=\"1939\" data-end=\"1963\"><p data-start=\"1941\" data-end=\"1963\">Durchsetzung von MFA<\/p><\/li><li data-start=\"1964\" data-end=\"2010\"><p data-start=\"1966\" data-end=\"2010\">Nutzung von OAuth 2.0 \u00fcber Microsoft Graph<\/p><\/li><\/ul><p data-start=\"2012\" data-end=\"2127\">F\u00fcr moderne Clients stellt das kein Problem dar. F\u00fcr \u00e4ltere Ger\u00e4te hingegen entsteht unmittelbarer Handlungsbedarf.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-61b7ed5 elementor-widget elementor-widget-heading\" data-id=\"61b7ed5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">H2: Welche Ger\u00e4te sind von der SMTP Abschaltung betroffen?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-113b7cf elementor-widget elementor-widget-text-editor\" data-id=\"113b7cf\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"1982\" data-end=\"2007\">Besonders betroffen sind:<\/p>\n<ul data-start=\"2009\" data-end=\"2227\">\n<li data-start=\"2009\" data-end=\"2049\">\n<p data-start=\"2011\" data-end=\"2049\">Multifunktionsdrucker (Scan-to-Mail)<\/p>\n<\/li>\n<li data-start=\"2050\" data-end=\"2065\">\n<p data-start=\"2052\" data-end=\"2065\">NAS-Systeme<\/p>\n<\/li>\n<li data-start=\"2066\" data-end=\"2081\">\n<p data-start=\"2068\" data-end=\"2081\">USV-Anlagen<\/p>\n<\/li>\n<li data-start=\"2082\" data-end=\"2113\">\n<p data-start=\"2084\" data-end=\"2113\">Firewall- und Router-Alerts<\/p>\n<\/li>\n<li data-start=\"2114\" data-end=\"2133\">\n<p data-start=\"2116\" data-end=\"2133\">Backup-Software<\/p>\n<\/li>\n<li data-start=\"2134\" data-end=\"2156\">\n<p data-start=\"2136\" data-end=\"2156\">Monitoring-Systeme<\/p>\n<\/li>\n<li data-start=\"2157\" data-end=\"2190\">\n<p data-start=\"2159\" data-end=\"2190\">\u00e4ltere ERP- oder CRM-L\u00f6sungen<\/p>\n<\/li>\n<li data-start=\"2191\" data-end=\"2227\">\n<p data-start=\"2193\" data-end=\"2227\">On-Premise Server mit SMTP Relay<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"2229\" data-end=\"2293\">Diese Systeme unterst\u00fctzen h\u00e4ufig keine OAuth-Authentifizierung.<\/p>\n<p data-start=\"2295\" data-end=\"2377\">Unternehmen sollten daher fr\u00fchzeitig alle SMTP-versendenden Ger\u00e4te identifizieren.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c9460b7 elementor-widget elementor-widget-heading\" data-id=\"c9460b7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Aktueller Stand zur SMTP Basic Auth Abschaltung (Update 2026)<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-cd3eec5 elementor-widget elementor-widget-text-editor\" data-id=\"cd3eec5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"358\" data-end=\"625\">Urspr\u00fcnglich war die Abschaltung von <strong data-start=\"395\" data-end=\"428\">SMTP Basic Auth Microsoft 365<\/strong> f\u00fcr September 2025 vorgesehen. Microsoft hat den Termin mehrfach verschoben. Nach aktuellem Stand ist die endg\u00fcltige Deaktivierung der klassischen SMTP-Authentifizierung f\u00fcr Dezember 2026 geplant.<\/p>\n<p data-start=\"627\" data-end=\"892\">Unabh\u00e4ngig von weiteren Terminverschiebungen empfiehlt es sich dringend, fr\u00fchzeitig auf eine moderne Alternative zu <strong data-start=\"743\" data-end=\"776\">SMTP Basic Auth Microsoft 365<\/strong> umzusteigen, um Ausf\u00e4lle bei Benachrichtigungssystemen, Monitoring-Tools oder Scan-to-Mail-Funktionen zu vermeiden.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8f45f5c elementor-widget elementor-widget-heading\" data-id=\"8f45f5c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">L\u00f6sungsans\u00e4tze f\u00fcr Legacy Ger\u00e4te ohne OAuth<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-fad0571 elementor-widget elementor-widget-text-editor\" data-id=\"fad0571\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"2832\" data-end=\"2886\">Grunds\u00e4tzlich existieren drei praktikable L\u00f6sungswege:<\/p><ol data-start=\"2888\" data-end=\"2974\"><li data-start=\"2888\" data-end=\"2917\"><p data-start=\"2891\" data-end=\"2917\">High Volume E-Mail (HVE)<\/p><\/li><li data-start=\"2918\" data-end=\"2945\"><p data-start=\"2921\" data-end=\"2945\">Externes SMTP-Postfach<\/p><\/li><li data-start=\"2946\" data-end=\"2974\"><p data-start=\"2949\" data-end=\"2974\">SMTP OAuth Relay Server<\/p><\/li><\/ol>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-c496a30 e-flex e-con-boxed e-con e-parent\" data-id=\"c496a30\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-d9e1833 elementor-widget elementor-widget-image\" data-id=\"d9e1833\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"248\" height=\"300\" src=\"https:\/\/itexperte24.de\/wp-content\/uploads\/2026\/02\/3d-rendering-flying-email-icon-web-flying-2-248x300.jpg\" class=\"attachment-medium size-medium wp-image-7381\" alt=\"SMTP Basic Auth Microsoft 365 Abschaltung und Sicherheitsrisiken f\u00fcr Unternehmen\" srcset=\"https:\/\/itexperte24.de\/wp-content\/uploads\/2026\/02\/3d-rendering-flying-email-icon-web-flying-2-248x300.jpg 248w, https:\/\/itexperte24.de\/wp-content\/uploads\/2026\/02\/3d-rendering-flying-email-icon-web-flying-2.jpg 380w\" sizes=\"(max-width: 248px) 100vw, 248px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-dc6fbdc elementor-widget elementor-widget-heading\" data-id=\"dc6fbdc\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">High Volume E-Mail (HVE) als Microsoft Alternative<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5756d08 elementor-widget elementor-widget-text-editor\" data-id=\"5756d08\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"3039\" data-end=\"3129\">Microsoft bietet mit <strong data-start=\"3060\" data-end=\"3088\">High Volume E-Mail (HVE)<\/strong> eine L\u00f6sung f\u00fcr h\u00f6here Versandlimits an.<\/p><p data-start=\"3131\" data-end=\"3238\">Dokumentation:<br data-start=\"3145\" data-end=\"3148\" \/><a class=\"decorated-link\" href=\"https:\/\/learn.microsoft.com\/en-us\/exchange\/mail-flow-best-practices\/high-volume-mails-m365\" target=\"_new\" rel=\"noopener\" data-start=\"3148\" data-end=\"3238\">https:\/\/learn.microsoft.com\/en-us\/exchange\/mail-flow-best-practices\/high-volume-mails-m365<\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-dea715a elementor-widget elementor-widget-heading\" data-id=\"dea715a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Technische Eckdaten von HVE<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b457128 elementor-widget elementor-widget-text-editor\" data-id=\"b457128\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ul><li data-start=\"3278\" data-end=\"3315\">SMTP Server: smtp-hve.office365.com<\/li><li data-start=\"3278\" data-end=\"3315\">Port: 587<\/li><li data-start=\"3278\" data-end=\"3315\">TLS erforderlich<\/li><li data-start=\"3278\" data-end=\"3315\">Bis zu 100.000 Mails pro Tag<\/li><li data-start=\"3278\" data-end=\"3315\">Bis zu 20 HVE-Konten pro Organisation<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b763b29 elementor-widget elementor-widget-heading\" data-id=\"b763b29\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Vorteile von HVE<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3e46f9b elementor-widget elementor-widget-text-editor\" data-id=\"3e46f9b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ul><li data-start=\"3454\" data-end=\"3485\">Kein eigener Server notwendig<\/li><li data-start=\"3454\" data-end=\"3485\">Nutzung direkt \u00fcber Microsoft Infrastruktur<\/li><li data-start=\"3454\" data-end=\"3485\">Hohe Versandlimits<\/li><li data-start=\"3454\" data-end=\"3485\">Einfache Einrichtung<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7f2143a elementor-widget elementor-widget-heading\" data-id=\"7f2143a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Einschr\u00e4nkungen von HVE<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6f06251 elementor-widget elementor-widget-text-editor\" data-id=\"6f06251\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ul><li data-start=\"3617\" data-end=\"3662\">Security Defaults m\u00fcssen deaktiviert werden<\/li><li data-start=\"3665\" data-end=\"3706\">Einschr\u00e4nkungen bei externen Empf\u00e4ngern<\/li><li data-start=\"3709\" data-end=\"3730\">Noch Public Preview<\/li><\/ul><p data-start=\"3709\" data-end=\"3730\">Unklare Preisstruktur<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-c547f7d e-flex e-con-boxed e-con e-parent\" data-id=\"c547f7d\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2449f1d elementor-widget elementor-widget-image\" data-id=\"2449f1d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"391\" height=\"207\" src=\"https:\/\/itexperte24.de\/wp-content\/uploads\/2026\/02\/IT-Services-und-E-Mail-Kommunikation-2.png\" class=\"attachment-large size-large wp-image-7350\" alt=\"SMTP Basic Auth Microsoft 365 Umstellung ab 2026 und Auswirkungen auf Legacy Ger\u00e4te\" srcset=\"https:\/\/itexperte24.de\/wp-content\/uploads\/2026\/02\/IT-Services-und-E-Mail-Kommunikation-2.png 391w, https:\/\/itexperte24.de\/wp-content\/uploads\/2026\/02\/IT-Services-und-E-Mail-Kommunikation-2-300x159.png 300w\" sizes=\"(max-width: 391px) 100vw, 391px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-210f777 elementor-widget elementor-widget-heading\" data-id=\"210f777\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Externes SMTP-Postfach bei einem Hosting-Anbieter<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f199f58 elementor-widget elementor-widget-text-editor\" data-id=\"f199f58\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"3872\" data-end=\"3960\">Eine Alternative ist die Nutzung eines externen SMTP-Servers bei einem <a href=\"https:\/\/www.ionos.de\/digitalguide\/e-mail\/e-mail-technik\/smtp-server\/\" target=\"_blank\" rel=\"noopener\">Hosting-Anbieter<\/a>.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a2773fa elementor-widget elementor-widget-heading\" data-id=\"a2773fa\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Technische Umsetzung<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e3cb2e2 elementor-widget elementor-widget-text-editor\" data-id=\"e3cb2e2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ul><li style=\"list-style-type: none;\" data-start=\"3278\" data-end=\"3315\"><ul data-start=\"3991\" data-end=\"4094\"><li data-start=\"3991\" data-end=\"4010\"><p data-start=\"3993\" data-end=\"4010\">Separate Domain<\/p><\/li><li data-start=\"4011\" data-end=\"4049\"><p data-start=\"4013\" data-end=\"4049\">SMTP-Versand \u00fcber Hosting-Anbieter<\/p><\/li><li data-start=\"4050\" data-end=\"4094\"><p data-start=\"4052\" data-end=\"4094\">SPF, DKIM, DMARC Konfiguration notwendig<\/p><\/li><\/ul><p data-start=\"4096\" data-end=\"4239\">Microsoft \u2013 SPF Konfiguration<\/p><\/li><li data-start=\"3278\" data-end=\"3315\"><p data-start=\"4096\" data-end=\"4239\">Microsoft \u2013 SPF Konfiguration<br data-start=\"4125\" data-end=\"4128\" \/><a class=\"decorated-link cursor-pointer\" href=\"https:\/\/learn.microsoft.com\/en-us\/defender-office-365\/email-authentication-spf-configure\" target=\"_new\" rel=\"noopener\" data-start=\"4128\" data-end=\"4239\">https:\/\/learn.microsoft.com\/en-us\/microsoft-365\/security\/office-365-security\/email-authentication-spf-configure<\/a><\/p><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4ef80dd elementor-widget elementor-widget-heading\" data-id=\"4ef80dd\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Nachteile dieser L\u00f6sung<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6f6cb3f elementor-widget elementor-widget-text-editor\" data-id=\"6f6cb3f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ul><li data-start=\"4275\" data-end=\"4310\">Absenderdomain unterscheidet sich<\/li><li data-start=\"4275\" data-end=\"4310\">H\u00f6herer administrativer Aufwand<\/li><li data-start=\"4275\" data-end=\"4310\">Abh\u00e4ngigkeit vom Drittanbieter<\/li><\/ul><p data-start=\"4383\" data-end=\"4433\">Technisch einfach, strategisch jedoch nicht ideal.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7273c69 elementor-widget elementor-widget-heading\" data-id=\"7273c69\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Einschr\u00e4nkungen von HVE<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f637680 elementor-widget elementor-widget-text-editor\" data-id=\"f637680\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ul><li data-start=\"3617\" data-end=\"3662\">Security Defaults m\u00fcssen deaktiviert werden<\/li><li data-start=\"3665\" data-end=\"3706\">Einschr\u00e4nkungen bei externen Empf\u00e4ngern<\/li><li data-start=\"3709\" data-end=\"3730\">Noch Public Preview<\/li><\/ul><p data-start=\"3709\" data-end=\"3730\">Unklare Preisstruktur<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-5f91de0 e-flex e-con-boxed e-con e-parent\" data-id=\"5f91de0\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-43c9e69 elementor-widget elementor-widget-heading\" data-id=\"43c9e69\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Technische Umsetzung eines SMTP OAuth Relay Servers<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-44eaeb4 elementor-widget elementor-widget-heading\" data-id=\"44eaeb4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Voraussetzungen<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b5962a7 elementor-widget elementor-widget-text-editor\" data-id=\"b5962a7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ul><li data-start=\"5322\" data-end=\"5349\">Debian oder Ubuntu Server<\/li><li data-start=\"5322\" data-end=\"5349\">Docker<\/li><li data-start=\"5322\" data-end=\"5349\">SSL-Zertifikat<\/li><li data-start=\"5322\" data-end=\"5349\">Microsoft Entra ID Application<\/li><li style=\"list-style-type: none;\"><ul><li style=\"list-style-type: none;\">\u00a0<\/li><\/ul><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3195be7 elementor-widget elementor-widget-heading\" data-id=\"3195be7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Docker Installation<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e13fafd elementor-widget elementor-widget-code-highlight\" data-id=\"e13fafd\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"code-highlight.default\">\n\t\t\t\t\t\t\t<div class=\"prismjs-default copy-to-clipboard\">\n\t\t\t<pre data-line=\"\" class=\"highlight-height language-javascript line-numbers\">\n\t\t\t\t<code readonly=\"true\" class=\"language-javascript\">\n\t\t\t\t\t<xmp>apt update\r\napt install docker-ce docker-ce-cli containerd.io\r\n<\/xmp>\n\t\t\t\t<\/code>\n\t\t\t<\/pre>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-56d28b2 elementor-widget elementor-widget-heading\" data-id=\"56d28b2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">SSL-Zertifikat erstellen<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f52f933 elementor-widget elementor-widget-code-highlight\" data-id=\"f52f933\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"code-highlight.default\">\n\t\t\t\t\t\t\t<div class=\"prismjs-default copy-to-clipboard\">\n\t\t\t<pre data-line=\"\" class=\"highlight-height language-javascript line-numbers\">\n\t\t\t\t<code readonly=\"true\" class=\"language-javascript\">\n\t\t\t\t\t<xmp>openssl req -x509 -newkey rsa:4096 -keyout key.pem -out cert.pem -days 3650 -nodes -subj '\/CN=localhost'\r\n<\/xmp>\n\t\t\t\t<\/code>\n\t\t\t<\/pre>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-265f0e8 elementor-widget elementor-widget-heading\" data-id=\"265f0e8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Container starten<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b21cda7 elementor-widget elementor-widget-code-highlight\" data-id=\"b21cda7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"code-highlight.default\">\n\t\t\t\t\t\t\t<div class=\"prismjs-default copy-to-clipboard\">\n\t\t\t<pre data-line=\"\" class=\"highlight-height language-javascript line-numbers\">\n\t\t\t\t<code readonly=\"true\" class=\"language-javascript\">\n\t\t\t\t\t<xmp>docker run --name smtp-relay -p 8025:8025 \\\r\n  -v $(pwd)\/certs:\/usr\/src\/smtp-relay\/certs \\\r\n  -e LOG_LEVEL=INFO \\\r\n  -e USE_TLS=True \\\r\n  -e REQUIRE_TLS=True \\\r\n  ghcr.io\/justiniven\/smtp-oauth-relay:latest\r\n<\/xmp>\n\t\t\t\t<\/code>\n\t\t\t<\/pre>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-e1aa516 e-flex e-con-boxed e-con e-parent\" data-id=\"e1aa516\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4a6032b elementor-widget elementor-widget-heading\" data-id=\"4a6032b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Fazit \u2013 Welche L\u00f6sung ist langfristig sinnvoll?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d1e9d5e elementor-widget elementor-widget-text-editor\" data-id=\"d1e9d5e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"1195\" data-end=\"1417\">Die Abschaltung von <strong data-start=\"1215\" data-end=\"1248\">SMTP Basic Auth Microsoft 365<\/strong> ist unausweichlich. Unternehmen sollten fr\u00fchzeitig auf moderne L\u00f6sungen wie SMTP OAuth Relay oder High Volume E-Mail umsteigen, um Betriebsunterbrechungen zu vermeiden.<\/p>\n<p data-start=\"6074\" data-end=\"6135\">F\u00fcr professionelle Unternehmensumgebungen empfehlen wir klar:<\/p>\n<p data-start=\"6137\" data-end=\"6164\"><strong data-start=\"6137\" data-end=\"6164\">SMTP OAuth Relay Server<\/strong><\/p>\n<p data-start=\"6166\" data-end=\"6186\">Diese L\u00f6sung bietet:<\/p>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul data-start=\"6188\" data-end=\"6258\">\n<li data-start=\"6188\" data-end=\"6202\">\n<p data-start=\"6190\" data-end=\"6202\">Sicherheit<\/p>\n<\/li>\n<li data-start=\"6203\" data-end=\"6216\">\n<p data-start=\"6205\" data-end=\"6216\">Kontrolle<\/p>\n<\/li>\n<li data-start=\"6217\" data-end=\"6235\">\n<p data-start=\"6219\" data-end=\"6235\">Skalierbarkeit<\/p>\n<\/li>\n<li data-start=\"6236\" data-end=\"6258\">\n<p data-start=\"6238\" data-end=\"6258\">Zukunftssicherheit<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0a8f3e4 elementor-widget elementor-widget-heading\" data-id=\"0a8f3e4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">ITEXPERTE24 unterst\u00fctzt Sie bei der SMTP-Umstellung<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-645420a elementor-widget elementor-widget-text-editor\" data-id=\"645420a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ul><li data-start=\"5322\" data-end=\"5349\"><p data-start=\"6324\" data-end=\"6349\">Wir unterst\u00fctzen Sie bei:<\/p><ul data-start=\"6351\" data-end=\"6543\"><li data-start=\"6351\" data-end=\"6387\"><p data-start=\"6353\" data-end=\"6387\">Analyse Ihrer SMTP-Infrastruktur<\/p><\/li><li data-start=\"6388\" data-end=\"6411\"><p data-start=\"6390\" data-end=\"6411\">Migration auf OAuth<\/p><\/li><li data-start=\"6412\" data-end=\"6451\"><p data-start=\"6414\" data-end=\"6451\">Installation von SMTP Relay Servern<\/p><\/li><li data-start=\"6452\" data-end=\"6489\"><p data-start=\"6454\" data-end=\"6489\">Einrichtung in Microsoft Entra ID<\/p><\/li><li data-start=\"6490\" data-end=\"6516\"><p data-start=\"6492\" data-end=\"6516\">Sicherheits\u00fcberpr\u00fcfung<\/p><\/li><li data-start=\"6517\" data-end=\"6543\"><p data-start=\"6519\" data-end=\"6543\">Wartung und Monitoring<\/p><\/li><\/ul><p data-start=\"6545\" data-end=\"6567\">Weitere Informationen:<\/p><p data-start=\"6569\" data-end=\"6638\">IT Sicherheit f\u00fcr Unternehmen<br data-start=\"6598\" data-end=\"6601\" \/><a class=\"decorated-link cursor-pointer\" target=\"_new\" rel=\"noopener\" data-start=\"6601\" data-end=\"6638\">https:\/\/itexperte24.de\/it-sicherheit\/<\/a><\/p><p data-start=\"6640\" data-end=\"6701\">IT Service in K\u00f6ln<br data-start=\"6658\" data-end=\"6661\" \/><a class=\"decorated-link\" href=\"https:\/\/itexperte24.de\/en\/it-service-koeln\/\" rel=\"nofollow\" data-start=\"6661\" data-end=\"6701\">https:\/\/itexperte24.de\/it-service-koeln\/<\/a><\/p><p data-start=\"6703\" data-end=\"6766\">Microsoft 365 Betreuung<br data-start=\"6726\" data-end=\"6729\" \/><a class=\"decorated-link cursor-pointer\" href=\"https:\/\/itexperte24.de\/en\/it-beratung\/\" rel=\"nofollow\" data-start=\"6729\" data-end=\"6766\">https:\/\/itexperte24.de\/microsoft-365\/<\/a><\/p><p data-start=\"6768\" data-end=\"6822\">Kontaktieren Sie uns f\u00fcr eine unverbindliche Beratung.<\/p><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>SMTP Basic Auth wird abgeschaltet \u2013 SMTP Basic Auth Microsoft 365 wird abgeschaltet \u2013 L\u00f6sungen f\u00fcr Legacy Ger\u00e4te ohne OAuth Stand: Februar 2026 Die Abschaltung von SMTP Basic Auth Microsoft 365 stellt viele Unternehmen vor technische Herausforderungen. Microsoft beendet schrittweise die Unterst\u00fctzung der klassischen SMTP-Authentifizierung in Exchange Online. F\u00fcr zahlreiche Ger\u00e4te und Systeme bedeutet das [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":7350,"comment_status":"open","ping_status":"open","sticky":false,"template":"elementor_header_footer","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-7347","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-posts"],"_links":{"self":[{"href":"https:\/\/itexperte24.de\/en\/wp-json\/wp\/v2\/posts\/7347","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/itexperte24.de\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itexperte24.de\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/itexperte24.de\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/itexperte24.de\/en\/wp-json\/wp\/v2\/comments?post=7347"}],"version-history":[{"count":0,"href":"https:\/\/itexperte24.de\/en\/wp-json\/wp\/v2\/posts\/7347\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/itexperte24.de\/en\/wp-json\/wp\/v2\/media\/7350"}],"wp:attachment":[{"href":"https:\/\/itexperte24.de\/en\/wp-json\/wp\/v2\/media?parent=7347"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itexperte24.de\/en\/wp-json\/wp\/v2\/categories?post=7347"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itexperte24.de\/en\/wp-json\/wp\/v2\/tags?post=7347"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}