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Use the Microsoft 365 admin center to enable or disable SMTP AUTH on specific mailboxes

1. Open the Microsoft 365 admin center and go to Users > Active users. 
2. Select the user, and in the flyout that appears, click Mail.
3. In the Email apps section, click Manage email apps.
4. Verify the Authenticated SMTP setting: unchecked = disabled, checked = enabled.
5. When you're finished, click Save changes

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