This could be handy

There's a nice new feature on Gmail - UNSEND - which allows you to, well unsend an email you have second thoughts about.

You have to work fast - it only gives you 5 seconds to recall it - but that might be all you need.

Actually, AOL had this feature years ago, back when AOL was the Internet for many people. As I recall, it only worked within the AOL universe (you couldn't unsend a message to another IP), and was only good if the mail hadn't been opened yet. But I'm glad to see Gmail has gotten around to this.