The 48 hour rule is where you wait 48 hours before sending an email like you did. Sit on it and see if you still feel the same way 48 hours later. I've used it a few times and it's saved me from sending potentially harmful emails.
Me: 29 W: 28 T: 10 M: 7 No kids 2 Dogs and 1 Cat With Parents: 09/16/07 Apartment: 10/13/07 Back Home: ~2/16/2008