This article covers 

Please check whether your email address is authorized/verified / blocked by your SMTP server

Office365 SMTP


Summary 


When you configure Office365 to be your SMTP provider, the below condition is to be met: 



The username that you have configured as part of SMTP settings in Office365, is the from_address that you have to configure in Chargebee. 


If the above criteria are not met, the SMTP error will persist, and prevent emails from being sent.