Email tends to be fairly useless in organizations because people don't read them and are overwhelmed by messages nobody needs to read. Slack and the like capitalize on being different from email by being instant and easy, what if someone else could capitalize on being slow and encouraging not-interrupting-people and putting thought into long form communication. (how many meetings have we all been to that should have been three sentences in an email?)
What organization do you work in? Everywhere I've worked, I've been responsible for every piece of information sent to me. Slack doesn't help at all. Conversations are based on person-to-person communications rather than ideas like an email thread with a subject line.
So when a sales person recieved an email from a prospect they would ignore it? When a developer recieved an email about a bug in production they would ignore it? All communication was done over chat? It's not impossible, but pretty implausible.
I'm certain there are equivalent settings in most email clients.
Edit: Updated seconds to minutes, I misread the form. Although I'm happy to report that you can set it to check every 43200 minutes if you so desire. :)