I’ve got a new thought: instead of sending off that email flame to the intended recipient, send it to yourself first.
Read it an hour later, and try to figure out whether it’s just that they are a pompus ass, just don’t get it, and have ended up winding you up; or whether you’ve actually got a point that your multitude of thinly vieled swearwords actually conveys.
How do you deal with frustration over email? I have a much abused stress toy that’s going to get thrown out the (perma-closed) window one day.