Using Multiple email domains as one organizaiont


The challenge:
Multiple independent email accounts with different domains need to function as one large company., frank@jaswant .com, need to function as if they were one company.
Need to replicate email, calendar, teams functionality that exists under one domain, under an exchange server, and provide for calendar visibility, broadcast messaging, fully unified capabilities.
All need to be managed by a single administrative entity.
The individual email domains need to stay intact... being that the users keep their existing domain as their functioning email address.
Can't use sub-domains from the perspective that the visible email address must stay the same. Can't go from to

Is this scenario even possible?
If yes... then how?

Any information is appreciated.

Microsoft 365 Publishing
Microsoft 365 Publishing
Microsoft 365: Formerly Office 365, is a line of subscription services offered by Microsoft which adds to and includes the Microsoft Office product line. Publishing: The process of preparing, producing, and releasing content for distribution or sale.
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