Thank you for your question
My name is Clare
I shall do my best to help you but I need some further information first
How old is the Child?
Then I am afraid there is no basis on which emails should be addressed to the child with regard to contact at all.
It is for your son to negotiate - via email if necessary - with the mother as to what the contact arrangements will be
It does not matter who the email is naked "FAO" if it is sent to the mother's email then it is sent to her and hence is a breach UNLESS it is directed at HER and deals with contact alone.
Please ask if you need further details