Write the email. Never send it.
want them to know just how much I’m angry at them. Has anyone gone through this? I know I should just live my life and forget them but I feel they should suffer.
They won't care and it won't hurt them or cause them to suffer.
It will hurt you to open yourself up and be rejected and blamed again.
You won't get the validation or vengeance or justice you're seeking. They won't repent and soothe the wounds they gave you (and it does sound like that's what you're still seeking - for them to respond by giving you the care and acceptance and protection you deserved as a child and naturally still want).
Even if you only sent it by email and blocked them, it would play on your mind - what if they have replied and I miss it, why don't they care enough to find another way to respond?
And putting it in writing to them gives them power over you again. They can share it and use it to cause you trouble.
You should be the one in control. Maintaining your silence keeps you in control, emailing them gives them control. You say you'll block them but honestly you wouldn't want to tell them any of these things if you didn't also want to see or hear or know their reaction. Which means as soon as you sent it they would be controlling your thoughts and emotions and actions.
There isn't any response that will make you feel better, but you are pretty much guaranteed responses that will make you feel worse.
Anger is a very normal part of processing trauma. It is entirely legitimate but it won't always be this intense and personally I would encourage you to find other ways to cope with it until then. Reengaging with them will only disrupt and delay your healing.