Modern Authentication Support for Email Send

Support is needed for modern auth sending from Control Cloud instances via Office 365 relay.  I want the emails to come from my domain but relay out via M365.  There is a solution that does this for on-prem Manage customers using Enterprise Apps and modern auth that proxies the SMTP request.  

We need something similar for ScreenConnect and since the code already exists this shouldn't be much work.

Either that or provide a known range of IPs a Cloud instance can send from so we can whitelist those IPs at MS and do an Exchange connector.