Let's start this story at the end: You can't kill email. Attempting to do so is a decades-long tradition of the tech industry, a cliché right up there with "Uber, but for" and "The Netflix of X." AOL Instant Messenger tried to kill email. So did MySpace. Then Facebook took up the mantle, followed by Slack and Symphony and WhatsApp and HipChat. Through it all, email persists—always dying, never dead. Except email isn't dying. There are 3.