The email did feel good, to some extent; it was just to my immediate boss, though, who i like a lot. The fallout will be MUCH better
Already my boss told me that he forwarded it to his manager and an a-hole director I've complained about, just before a meeting with them and some others. That Director was shaken up some, apparently stumbling over words in the meeting and not 100% concentrating.
He now knows that a critical project is at an even greater risk without my knowledge/experience. He also knows I will - tactfully - say some less-then-stellar things about him.