The 5 Things Your Emails Need to Include to Get People to Read and Respond

There's a reason this tweet, sent at 9 a.m. on March 1, amassed nearly 4,000 retweets and over 2,000 favorites in a matter of hours.

Eli Langer, who runs social media at CNBC, isn't the only one with a crazy amount of unread emails. These days, maintaining "inbox zero" is a feat of diligent OCD.

Of course, what can we expect when of the nearly 200 billion emails sent every day worldwide (84 percent are considered spam).

That's 168 billion emails ... disregarded. You might be tempted to think that just applies to marketing emails. But you'd be wrong.