@Matt_Noyes, @idmyn is right, it's free service allowing us to set forwarding aliases on the #SocialCoop domain, granted by #WebArchitects to allow us to manage our #GitCoop accounts. It isn't intended for full email accounts.

Our Mastodon notifications go out via a bulk mailing service, Mailgun. This is also not designed to manage full email accounts.

So far we've not needed anything more. Besides it's also good to keep things simple from an admin point of view - until we have more admins!