Clicking on "send" has its limitations as a system of subtle communication....

Clicking on "send" has its limitations as a system of subtle communication. Which is why, of course, people use so many dashes and italics and capitals {"I AM joking!"} to compensate. That's why they came up with the emoticon, too-the emoticon being the greatest {or most desperate, depending how you look at it} advance in punctuation since the question mark in the reign of Charlemagne.
You will know all about emoticons. Emoticons are the proper name for smileys. And a smiley is, famously, this:
:-}
Forget the idea of selecting the right words in the right order and channelling the reader's attention by means of artful pointing. Just add the right emoticon to your email and everyone will know what self-expressive effect you thought you kind-of had in mind. Anyone interested in punctuation has a dual reason to feel aggrieved about smileys, because not only are they a paltry substitute for expressing oneself properly; they are also designed by people who evidently thought the punctuation marks on the standard keyboard cried out for an ornamental function. What's this dot-on-top-of-a-dot thing for? What earthly good is it? Well, if you look at it sideways, it could be a pair of eyes. What's this curvy thing for? It's a mouth, look! Hey, I think we're on to something.
:-{
Now it's sad!
;-} It looks like it's winking!
:-r
It looks like it's sticking its tongue out! The permutations may be endless:
:~/ mixed up!
<:-} dunce!
:-{ pouting!
:-O surprise!
Well, that's enough. I've just spotted a third reason to loathe emoticons, which is that when they pass from fashion {and I do hope they already have}, future generations will associate punctuation marks with an outmoded and rather primitive graphic pastime and despise them all the more. "Why do they still have all these keys with things like dots and spots and eyes and mouths and things?" they will grumble. "Nobody does smileys any more.