OAuth2 is the recommended TLS option for Microsoft Entra. This article indicates how to configure the TLS option for Custom SMTP in your Portal.

Advise the following instructions:

1. Access the Admin Experience as a System Administrator.
2. Open Account Menu in the top right corner and select Portal Settings.
   
3. Select Edit Custom SMTP Configuration from the right hand side.
   
4. Make certain you have configured a Verify SMTP Contact, Port & From Email Address for the Custom SMTP configuration.
5. Click the Use TLS toggle to turn it ON.
   
6. Select OAuth2 as the Authentication Type.
   
7. Click Update OAuth Authorization.
   
8. A new page will open where you will be asked to authenticate via Microsoft. You will be asked to authorize the AbsorbLMS Custom SMTP application. Allow the application.
9. When redirected to Absorb, make certain to Save.
10. Test the Custom SMTP configuration.

Additional Information

The following information relates to the topic of OAuth2 and Microsoft Entra:

• How to Authenticate with OAuth | Microsoft Support
• Quickstart Registration for an Application in Microsoft Entra | Microsoft Support