Microsoft Disabling Basic Auth for SMTP

Microsoft is disabling Basic Authentication for the SMTP protocol. If your TAS instance sends emails via a Microsoft 365 (Office 365) SMTP server using a username and password, you must migrate to modern OAuth 2.0 authentication.

Basic SMTP authentication (Basic Auth) for Microsoft 365 will be disabled on December 2026. Outgoing emails will stop working if migration to OAuth is not completed.

Who is affected

  • Customers and partners who have TAS configured to send emails via Microsoft's SMTP server (smtp.office365.com)
  • Instances where SMTP is configured with a username and password (Basic Auth)

What needs to be done

You need to switch from Basic Auth to OAuth 2.0 authentication. This requires registering an application in Azure Active Directory and updating the SMTP configuration in TAS.

A detailed guide for configuring SMTP with OAuth authentication is available here:

SMTP – OAuth Authentication

If you need assistance with the migration, please contact your TAS consultant or Neit Group support.

Frantisek Brych Updated by Frantisek Brych

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