[Pro-Tip] When writing a delicate email, enter the To: last

So, if you are writing one of those emails that you have to get right, and you plan to check and proof and think about, then don't start by typing the To:. As long as you don't type the To: you can't accidentally send it out before you finish writing it. Once you write the To:, and accidental or careless send will possibly cause collateral damage if you're not done word smithing your message.