{"id":1929,"date":"2026-01-28T14:31:08","date_gmt":"2026-01-28T14:31:08","guid":{"rendered":"https:\/\/www.mysmtp.blog\/?p=1929"},"modified":"2026-01-30T11:00:13","modified_gmt":"2026-01-30T11:00:13","slug":"microsoft-is-pulling-the-plug-on-smtp-auth-in-exchange-december-2026","status":"publish","type":"post","link":"https:\/\/www.mysmtp.blog\/2026\/01\/28\/microsoft-is-pulling-the-plug-on-smtp-auth-in-exchange-december-2026\/","title":{"rendered":"Microsoft Is Pulling the Plug on SMTP AUTH in Exchange \u2014 December 2026\u00a0"},"content":{"rendered":"\t\t
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Latest:<\/strong>\u00a0 New Timeline Announced<\/a><\/span><\/span><\/h5>

Microsoft Is Pulling the Plug on SMTP AUTH in Exchange \u2014 December 2026\u00a0<\/span><\/p>

Back in August, we wrote a blog post about Microsoft\u2019s plan to disable SMTP AUTH. Now the deadline is rapidly approaching.<\/span>\u00a0<\/span><\/p>

How to Keep Your Printers, Scanners, and Apps Connected<\/span><\/b>\u00a0<\/span><\/p>

Microsoft is officially phasing out\u00a0<\/span>Basic Authentication for SMTP<\/span><\/b> in December<\/strong>\u00a02026<\/span><\/b>.<\/span>\u00a0<\/span><\/p>

Microsoft Is Changing How Email Works \u2014\u00a0Here\u2019s\u00a0the Simple Way to Keep Your Devices Connected<\/span><\/b>\u00a0<\/span><\/p>

The 2026 SMTP update is coming, but keeping your printers and applications running is easier than you think with\u00a0<\/span>mySMTP<\/span><\/b>.<\/span>\u00a0<\/span><\/p>

If your business relies on Microsoft Exchange Online to send emails from multifunction printers, scanners, IoT devices, or legacy applications, you are\u00a0likely already\u00a0aware of the ticking clock. Microsoft has announced the phase-out of\u00a0<\/span>SMTP AUTH (Client Submission)<\/span><\/b>, with a final sunset date scheduled for December<\/strong><\/span>\u00a0<\/strong>2026<\/span><\/b>.<\/span>\u00a0<\/span><\/p>

While this move is a major step forward for global cybersecurity\u2014forcing a shift toward modern authentication standards like\u00a0<\/span>OAuth 2.0<\/span><\/b>\u2014it places many IT administrators in a difficult position.<\/span>\u00a0<\/span><\/p>

Why?<\/span><\/b>\u00a0<\/span><\/p>

Because millions of devices and applications in offices worldwide simply do not support OAuth 2.0. They were designed to authenticate using a simple username and password. Once Microsoft disables this capability, those devices will no longer be able to send email.<\/span>\u00a0<\/span><\/p>

Below, we explain how the landscape is changing\u2014and how\u00a0<\/span>mySMTP<\/span><\/b>\u00a0provides the bridge you need to keep your infrastructure running without replacing hardware.<\/span>\u00a0<\/span><\/p>

\u00a0<\/span><\/p>

The Challenge: \u201cModern Authentication\u201d vs. Legacy Reality<\/span><\/b>\u00a0<\/span><\/p>

Microsoft\u2019s push for\u00a0<\/span>Modern Authentication<\/span><\/i>\u00a0is intended to protect user accounts from brute-force and credential-based attacks. However, in practice, upgrading an entire fleet of physical devices or rewriting legacy application code is often cost-prohibitive\u2014or technically impossible.<\/span>\u00a0<\/span><\/p>

You may be dealing with:<\/span>\u00a0<\/span><\/p>

  • ERP or accounting systems hard-coded to send invoices via port 587<\/span>\u00a0<\/span><\/li><\/ul>
    • Printers and scanners that only support \u201cSMTP Server,\u201d \u201cUsername,\u201d and \u201cPassword\u201d<\/span>\u00a0<\/span><\/li><\/ul>
      • IoT devices or alerting systems that cannot handle token-based authentication flows<\/span>\u00a0<\/span><\/li><\/ul>

        When April 2026 arrives, any system still pointing to\u00a0smtp.office365.com\u00a0using Basic Auth will stop working.<\/span>\u00a0<\/span><\/p>

        \u00a0<\/span><\/p>

        The Solution:\u00a0mySMTP\u00a0as Your Compatibility Layer<\/span><\/b>\u00a0<\/span><\/p>

        At\u00a0<\/span>mySMTP<\/span><\/b>, we specialize in being the reliable email delivery engine for exactly these scenarios. We understand that while security is critical, operational continuity is\u00a0non-negotiable.<\/span>\u00a0<\/span><\/p>

        Here\u2019s how\u00a0mySMTP\u00a0supports customers migrating away from Microsoft\u2019s legacy SMTP service:<\/span>\u00a0<\/span><\/p>

        1. Plug-and-Play Compatibility<\/span><\/b>\u00a0<\/span><\/p>

        In most cases, migrating to\u00a0mySMTP\u00a0is as simple as changing three fields in your device or application settings. Because we support standard SMTP authentication over secure TLS connections,\u00a0there\u2019s\u00a0no need to update or replace your hardware.<\/span>\u00a0<\/span><\/p>

        • Old setting:<\/span><\/b>\u00a0smtp.office365.com<\/span>\u00a0<\/span><\/li><\/ul>
          • New setting:<\/span><\/b>\u00a0(your\u00a0mySMTP\u00a0email\u00a0eg: \u201drelay1.mysmtp.com\u201d\u00a0<\/span>\u00a0<\/span><\/li><\/ul>

            \u00a0<\/span><\/p>

            2. Dedicated IPs for Superior Deliverability<\/span><\/b>\u00a0<\/span><\/p>

            With large shared services like Office 365, your transactional emails share sending reputation with millions of other users. mySMTP offers\u00a0<\/span>Dedicated IP plans<\/span><\/b>, ensuring your automated emails are sent from an IP address used only by your organization.<\/span>\u00a0<\/span><\/p>

            Your reputation is yours alone\u2014so critical emails like invoices, alerts, and reports aren\u2019t blocked due to someone else\u2019s spam.<\/span>\u00a0<\/span><\/p>

            \u00a0<\/span><\/p>

            3. Cloud-Based and GDPR-Compliant<\/span><\/b>\u00a0<\/span><\/p>

            For European customers\u2014and anyone concerned with data privacy\u2014moving away from a US-centric provider can actually improve compliance.<\/span>\u00a0<\/span><\/p>

            mySMTP is fully hosted within the\u00a0<\/span>EU<\/span><\/b>, offering a secure, resilient infrastructure that respects data sovereignty while delivering enterprise-grade uptime.<\/span>\u00a0<\/span><\/p>

            \u00a0<\/span><\/p>

            4. Built for \u201cNon-Human\u201d Email<\/span><\/b>\u00a0<\/span><\/p>

            Microsoft Exchange is optimized for human-to-human communication. mySMTP is designed for\u00a0<\/span>machine-to-human<\/span><\/b>\u00a0messaging.<\/span>\u00a0<\/span><\/p>

            We don\u2019t throttle your scanner because it sent \u201ctoo many\u201d PDFs in an hour. Our platform is optimized for high-volume, transactional email\u2014so your automated workflows won\u2019t hit unexpected sending limits.<\/span>\u00a0<\/span><\/p>

            \u00a0<\/span><\/p>

            How to Migrate in 3 Simple Steps<\/span><\/b>\u00a0<\/span><\/p>

            Don\u2019t wait until December 2026 to scramble for a solution. You can migrate your devices today\u2014in just minutes:<\/span>\u00a0<\/span><\/p>

            1. Create an account<\/span><\/b>\u00a0
              Sign up at\u00a0<\/span>mysmtp.com<\/span><\/b>\u00a0and choose a plan that fits your email volume.<\/span>\u00a0<\/span><\/li>
            2. Update your device or application<\/span><\/b>\u00a0
              Log in to your printer, scanner, or app configuration and replace the Microsoft SMTP details with your mySMTP credentials.<\/span>\u00a0<\/span><\/li>
            3. Optional: IP Whitelisting<\/span><\/b>\u00a0
              You can also whitelist your sending device\u2019s IP address, eliminating the need for SMTP AUTH altogether.<\/span>\u00a0<\/span><\/li><\/ol>


              That\u2019s it. You\u2019re now insulated from Microsoft\u2019s deprecation timeline.<\/span>\u00a0<\/span><\/p>

              Ready to test the migration?<\/span><\/b>\u00a0
              Start a free trial with\u00a0<\/span>mySMTP<\/span><\/b>\u00a0today and see how easy it is to switch.<\/span>\u00a0<\/span><\/p>

              \u00a0<\/span><\/p>

              \u00a0<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

              Latest:\u00a0 New Timeline Announced Microsoft Is Pulling the Plug on SMTP AUTH in Exchange \u2014 December 2026\u00a0 Back in August, we wrote a blog post about Microsoft\u2019s plan to disable SMTP AUTH. Now the deadline is rapidly approaching.\u00a0 How to Keep Your Printers, Scanners, and Apps Connected\u00a0 Microsoft is officially phasing out\u00a0Basic Authentication for SMTP […]<\/p>\n","protected":false},"author":3,"featured_media":1931,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_oct_exclude_from_cache":false,"footnotes":""},"categories":[8,30],"tags":[],"class_list":["post-1929","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-security","category-smtp-technology-updates"],"yoast_head":"\nMicrosoft Is Pulling the Plug on SMTP AUTH in Exchange \u2014 December 2026\u00a0 - mySMTP BLOG<\/title>\n<meta name=\"description\" content=\"Microsoft will disable SMTP AUTH in Exchange Online in April 2026. 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