I’m pretty good, but I’m not perfect. I’ve made mistakes that I learned from in my career.
But there’s one that so minor, I’m surprised to see anyone still doing it in 2015. I’ve witnessed account execs drafting emails (originals, reply, or reply-all) with all the recipients listed in the addressee field. That’s a recipe for embarrassment if you by chance include typos, inappropriate language, or unverified information and the email is accidentally sent.

Yep. Recipe for disaster.
How do I know this? It’s one of the aforementioned mistakes I’ve made. And once you hit send (sometimes by mistake), that typo or accidental profanity is sent along with it.
It’s so simple to avoid this embarrassment. When replying to an email, remove all the recipients. After you’ve drafted your response, give it a glance to ensure there are no errors. Then add all the recipients back in.
Whatever you do, don’t let premature send happen to you.