you can write the email and not send it...just to get it out.
I am thinking this was done precisely to cause a reaction in you.
When someone does that to me I get stubborn!
I identify it as a power and control move and that always gets me to that urge that living well is the best revenge.
How about taking yourself out for something nice to you.
When I am mad that often works as a gotcha in my mind...i.e. "You are trying to hurt me, I deserve to be treated well and I am doing it"
so there...sticks tongue out and thumbs nose