I do it while its in my head. Put it all down.
the facts, feeling,whatever.
DO NOT SEND
then, cool out,..... and go back to it after the chill pill and rewrite
I somtimes do several drafts!
mine start out " Why you little P.... B..... ..*&^%$#@....."
then, after a chill, it states " Per our conversation earlier I would like to.....
but thats just me