SugarCRM Office 365 mail relay.

SugarCRM Office 365 mail relay.

Setup Microsoft “App registrations” and Sugar's Microsoft Connector.

https://support.sugarcrm.com/Knowledge_Base/Connectors_Integrations/Integrating_With_Microsoft_for_Admins/

Email settings

Van / From: Real email address same as authorized email.

Button “Authorize” – login as user that sends the email.

Test: button “Send Test Email”

If it does not work, check the logs.  

Admin > System Settings > View Log https://support.sugarcrm.com/Knowledge_Base/Troubleshooting/Introduction_to_Sugar_Logging/#Viewing_the_Log
 

Microsoft must be able to send mail through authenticated SMTP

https://docs.microsoft.com/en-us/exchange/clients-and-mobile-in-exchange-online/authenticated-client-smtp-submission