How To Start Entrepreneur Online: You Need to Extend the 'Undo Send' Timer on Your Email

“Undo Send” is a godsend. Everyone knows you only catch the most egregious typos and remember the most important attachments immediately after you hit send on an email, so having a button that cancels your outgoing message before it hits someone else’s inbox is essential. But if you’re using your email app as-is, you…