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Add warning for Outlook365 email configuration #8564

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Add warning for Outlook365 email configuration #8564

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6a68321
Add warning for Outlook365 email configuration
svelle Nov 21, 2025
a03c330
Update warning about Outlook365 Basic Auth support
svelle Nov 21, 2025
34ae702
Fix formatting of warning about Outlook365 Basic Auth
svelle Nov 21, 2025
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3 changes: 3 additions & 0 deletions source/administration-guide/configure/smtp-email.rst
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Expand Up @@ -25,6 +25,9 @@ Any SMTP email service can be used. You need a copy of the following information

If deploying Mattermost using :doc:`Docker </deployment-guide/server/deploy-containers>`, the standard docker ``172.16.0.0/12`` IP range isn't used. Specify the IP range ``192.168.0.0/24`` to the email service to avoid relay access errors. If using postfix, under ``/etc/postfix/main.cf``, specify ``mynetworks = 192.168.0.0/24``. This may vary depending on how Mattermost is deployed. Ensure that **Port 25** is open if a firewall is present.

.. warning::
`Outlook365 no longer supports Basic Auth <https://support.microsoft.com/en-us/office/pop-imap-and-smtp-settings-for-outlook-com-d088b986-291d-42b8-9564-9c414e2aa040>`__ which is required by Mattermost. We recommend using an alternate Email service like AWS SES (Simple Email Service).

Configure SMTP settings
------------------------

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