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  1. Microsoft Learn
    https://learn.microsoft.com/.../authenticated-client-smtp-submission

    Enable or disable SMTP AUTH in Exchange Online | Microsoft Learn

    • Microsoft

      Microsoft - Enable or disable SMTP AUTH in Exchange Online | Microsoft Learn

    • How to create authenticatio…

      Learn about how to use a service principal to create authentication credentials for …

    See results only from learn.microsoft.com
  3. Microsoft Learn
    https://learn.microsoft.com/en-us/exchange/mail-flow-best-practices/...

    How to set up a multifunction device or application to send emails ...

  4. IONOS
    https://www.ionos.com/digitalguide/e-mail/tech…

    What is SMTP authentication? SMTP Auth explained

    WebSep 27, 2023 · SMTP authentication, also known as SMTP AUTH or ASMTP, is an extension of the extended SMTP (ESMTP), which, in turn, …

    • Estimated Reading Time: 8 mins
    • People also ask
      What is SMTP AUTH?
      Applications, reporting servers, and multifunction devices that generate and send email messages. The SMTP AUTH protocol is used for SMTP client email submissions, typically on TCP port 587. SMTP AUTH supports modern authentication (Modern Auth) through OAuth in addition to basic authentication.

      Enable or disable SMTP AUTH in Exchange Online | Microsoft Learn

      learn.microsoft.com
      How to enable SMTP Authentication in Microsoft 365?
      By default, Microsoft 365 disables SMTP authentication (SMTP AUTH). However, you can easily enable it with just a few clicks from your Microsoft 365 admin center. The next section shows you how to do this in detail. Once you enable SMTP AUTH client submission, you can set up email sending by entering the SMTP server details from above.

      Microsoft 365 SMTP Settings (Office 365) Explained - Kinsta

      kinsta.com
      What happened to basic authentication with client submission (SMTP AUTH)?
      Today, we are announcing that Exchange Online will permanently remove support for Basic authentication with Client Submission (SMTP AUTH) in September 2025. After this time, applications and devices will no longer be able to use Basic auth as an authentication method and must use OAuth when using SMTP AUTH to send email.

      Exchange Online to retire Basic auth for Client Submission (SMTP AUTH)

      techcommunity.microsoft.com
      Is SMTP AUTH client submission compatible with my business needs?
      SMTP AUTH client submission (Option 1) isn't compatible with your business needs or with your device. You only need to send messages to recipients in your own organization who have mailboxes in Microsoft 365 or Office 365; you don't need to send emails to people outside of your organization.

      How to set up a multifunction device or application to send emails

      learn.microsoft.com
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    • Mailtrap
      https://mailtrap.io/blog/office-365-smtp

      How to Set Up and Configure Office 365 SMTP to Send Emails

    • Kinsta
      https://kinsta.com/knowledgebase/office-365-…

      Microsoft 365 SMTP Settings (Office 365) Explained

      WebMay 9, 2024 · By default, Microsoft 365 disables SMTP authentication (SMTP AUTH). However, you can easily enable it with just a few clicks from your Microsoft 365 admin center. The next section shows you how to do …

    • Mailgun
      https://www.mailgun.com/blog/deliverability/smtp-commands

      Your Guide to SMTP Commands and Best Practices | Mailgun

    • Mailtrap
      https://mailtrap.io/blog/smtp

      SMTP Basics: How It Works and Why It Matters [2024]

      WebJan 25, 2024 · Speaking of extensions, we should also mention the SMTP-AUTH extension, which adds an authentication step to the process. This means that the mail client should log in to the mail server using its …