In my experience, the majority of people doesn't have the slightest clue how mail works. Somehow you type it in and provide it with an address into one of the three indistinguishable fields that are titled "To", " CC", "BCC". And by some black magic it either appears on the screen of the other person. Or it doesn't. That's about the amount of knowledge.
So comparing something to this is kind of meaningless.
And we still don't have any worthy successor. In contrast to the pony express.