Something bothering you ? Something getting you angry? Did somebody push your buttons?
WAIT...DO NOT SEND OFF THAT EMAIL.
Email can be a wonderful tool but if you use it to vent or let your anger out it can be quite the opposite.
Sometimes just for therapy I would type a response and then minimize it and come back to it in a few hours and if I was being too reactionary I would end up re reading it and either change the text or just delete it all together.
It is too easy to send a scorching email and most times all it will do is fan the flames and in some cases burn bridges that may be very difficult to repair.
And what did you actually accomplish?
I find that sometimes, actually most times, the least said the better.