And e-mail as a base for instant messaging is not a great idea, as SMTP is not an instant protocol. Sure, most of the time it's fast, but doesn't guarantee spee

And e-mail as a base for instant messaging is not a great idea, as SMTP is not an instant protocol. Sure, most of the time it's fast, but doesn't guarantee speedy delivery at all, and timeout and redelivery timers are quite big.