does anyone have any suggestion for a Mail Server.
the unique requirements are:
it should work like a Microsoft Exchange On-premises Solution but on the cloud.
the main requirements are:
any mail that is deleted should not get purged, but be stored in a repository.
it should be able to connect any and all smartphones
The system should allow the admin to control Mail Routing (like in an on premises microsoft exchange server)
Please share if anyone has any advice / solutions.