Gmail itself, in that situation, is just a frontend to the mail server. You can use the same domain, on any mail server, with any frontend, and it would work just as well. It’s just that Google Workspace apps are familiar to most users. But even then, the industry leader is Microsoft with their Office Suite which is yet another option
Eh, lots of companies use gmail it’s just masked by being their own domain and part of g suite.
Gmail itself, in that situation, is just a frontend to the mail server. You can use the same domain, on any mail server, with any frontend, and it would work just as well. It’s just that Google Workspace apps are familiar to most users. But even then, the industry leader is Microsoft with their Office Suite which is yet another option
It’s still Google’s mail server. The mail client is irrelevant.