Having issues relaying mail from with SSL or TLS not being an option.  You can your the MX Points to Address as the SMTP Relay address.

Log into the Office 365 portal – https://portal.office.com

Click Domains > then select the domain and click ‘Manage DNS’

SMTP1

Select the full “Points to Address”
SMTP2

 

 

 
SMTP: domain-com.mail.protection.outlook.com
PORT: 25