That's not really what the article says. The point they're making is that if you expect to receive a lot and then you don't then you think your email account isn't working correctly.

“I haven’t gotten an email in seven minutes, making me immediately suspicious my email is broken.”

That's actually a complaint that the user is getting too much email (or possibly the right amount); it's just phrased in a way that makes it look like it's the opposite.

That's maybe the most interesting finding. Receive too much e-mail? Business as usual. Not so many? The world is coming to an end. If this is not a sign of withdrawal, I don't know what is :D