When sending a CC (carbon copy) to someone from the closing of the letter, how many spaces should separate you from the name of person sending it to you, Closing of Letter?
Your sentence is very confusing as to who is sending and receiving the letter.
Anyway, the cc is usually placed at the bottom of the letter after your signature. I don't think there is any hard and fast rule about the spacing.
Obviously, you allow more space with a short letter and less space with a long letter.