This video shows you how to setup Dynamics 365 Business Central Email and highlights a current error that some users might face during their Trial period when setting up the email setup.
The error shows as follows:
The Email Couldn't be Sent
The mail system returned the following error: "The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.57 SMTP; Client was not authenticated to send anonymous mail during MAIL FROM [SY3PR01CA0120.ausprd01.prod.outlook.com]".
If your username and password are 100% correct; watch this video to resolve this issue.