If you’re wanting to avoid needing to manually configure your clients, see this:
If you’re instead talking about using a different protocol than POP/IMAP/SMTP, I don’t believe there are any other options.
If you’re wanting to avoid needing to manually configure your clients, see this:
If you’re instead talking about using a different protocol than POP/IMAP/SMTP, I don’t believe there are any other options.