How your Husband feels about the email is irrelevant. This is about YOU speaking UP for YOURSELF and your CHILDREN. Again he has YOU fixated on HOW he is going to react... You are like a child walking aroudn the playground psyching yourself to stand up to the big bully... and you are so tense about how that's going to pan out...
Talk to a lawyer with legal aid then.
The financial thing he's just BS'ing you on.
You two don't have DIFFERENT finances. IF you are a COUPLE then its HOUSEHOLD income, period. It all goes in teh SAME BUCKET. There isn't a 'his money", "her money" and "our money".. its household funds.
If he is paying RENT to live under a separate roof that RENT money could go into a savings account for your kids education... its WASTED money becuase he can't egt his a$$ home and act like an adult.
This isn't an argument, its basic math. Couples don't have a his, hers, and hosueholds, funds, it is all the same money, you are a COUPLE... HE is just playing bachelor with household funds and getting away with it.
Your H is also picking fights about finances to avoid the elephant in the room. He's a bully my dear.
How you deal with that under the same roof?
Your HUSBAND needs to go to marital therapy and take some individual therapy to deal wiht his anger issues. He USES ANGER to CONTROL you and everyone else. This is how he gets what he wants.. he intimidates people into walking carefully around him and just catering to what he wants to avoid upsetting him further... its classic bullying.
However this guy appears to only bully women... which is worse.
Don't send the email until you get some legal advice.