The simple answer is yes.

The bigger question is, should we try configure two hosting providers with the one business domain, or can we do this with Microsoft alone?

The answer is, we can do it either way. It is much higher risk using two providers as there is a complex configuration we would need to go through to ensure mail is routed to the correct provider, depending on the email address used.

This is achieved using:

• Microsoft 365 as the primary mail server (MX records point to Microsoft)
• Mail flow connectors in Exchange Online
• Shared domain configuration
• Forwarding / routing rules between Microsoft and cPanel

Microsoft calls this a “shared email domain” or hybrid mail routing.

This works, but:

• More complex to set up
• More difficult to troubleshoot
• Can cause mail loops if configured incorrectly

I generally only recommend this when a customer is migrating gradually.