I agree that normal email-to-email might not disappear. But considering that most email users are either using Outlook or Gmail, and both these systems not bein

I agree that normal email-to-email might not disappear. But considering that most email users are either using Outlook or Gmail, and both these systems not being forced to use Email protocol when the receiver is using the same network, I'd guess that email isn't that much more reliable than FB messages when it comes to getting deleted.