Been there, done that. In my case, it was a reply all, including the jerk! Was a high pressure, six figure sales scenario too. Jerk was on product approval team. Ugly.
Funny thing, the jerk owned it. Said basically, "truth", but was secure in being a jerk. The others were a lot more upset. Not only did I put it out there frank, raw, blunt, but they were sucked into what could be a real mess! The whole deal was at major risk.
You know it's bad when your phone rings 30 seconds after "send." You know it's worse when other calls come in rapid fire. Beep, beep, beep...
Before it went too far, I dropped an ice breaker to the effect of, "Hey Jerk I cannot take it back, but I can give you one free swing, let whatever it is really slide", in the figurative sense.
Jerk said, "cool, I will keep that in mind." And, "you are not wrong." Gave reasons.
Laughs all around from there, major event averted.
We (jerk and I) actually got along after that. Seeing how secure they were, and understanding their why really helped! I got it. Outside the workplace they were unlikely to be that jerk.
The deal went through. I ended up working with Jerk.
Moral: seek understanding of others. There may be more there than it may seem.