I sometimes feel receiving e-mails from her tells me where her head is at and helps me from being blindsided. We have no children. We have no shared assets. There is no reason to communicate.
Whether or not you should delete probably depends on a few factors... .
I understand not wanting to be "blindsided," especially since you will have to see her in court. Knowing that she is angry will help you "armor up" on the day that you have to appear - you'll know what you will be facing. I would like to know that as well - so I can understand leaving the email account activated. (As an aside, I DO think it's very good that you haven't responded.)
I guess I'm wondering, though, how much these emails "set you back." If you find yourself in a funk for days after receiving them, you may want to delete the account.
Whatever you decide, I would delete it as soon as your court case is complete - cut off all means of contact and move on.