This source is known to forward email
forwarding notes:Because this is a massive multi-tenant environment, if traffic cannot be reliably identified as first-party, it has to be categorized as Forwarded. Generally traffic will begin to be categorized as non-forwarded if it passes SPF in alignment.
Microsoft 365 is a sophisticated email platform that supports full DMARC compliance for its customers. We've created a guide to provide you with all of the necessary steps and considerations for configuring Microsoft 365: https://dmarcian.com/ms365-source-guide/
See our guide to configure DKIM.
See our guide to configure SPF.