Lesson 1 of social media. Don't send important emails from the coffee shop as it's closing, and you are trying to get finished before the doors close.
Just re-read an email I sent, introducing myself to a literary agent. There's a TYPO in the first paragraph! GAG!
Lesson: take your time, save as a draft, reread the next day before you press SEND on an important email. (Duh.)