When I used to teach my college class, I used to really warn my kids about asymmetrical information. What you thought might be really clever might be really important to the person you are sending the email to!
Ian RiccaboniI receive a lot of emails and I cannot stress enough how you badly you can unwind an otherwise really nice email with a barb that really doesn't need to be in the email no matter how nice it makes you feel when you send the email!