Hi @RBDport,
As far as I know, there’s only an Office 365 outlook connector available in the power platform so you’ll need a M365 subscription for that. But then you can send an email to any valid email address…
Don’t think MSFT allows you to create a single “service account” in M365 to handle email for everyone because everywhere in the documentation it reads: “This is not shareable connection. If the power app is shared with another user, another user will be prompted to create new connection explicitly.”
But I’m sure @henry.habib can confirm that…
And finally here you can read on how to connect to Office 365 Outlook from Power Apps
I hope this is helpful