Regardless of the private issues and differences between the two parties in this matter two things stand out about this "other persons" actions in this matter, one is the (self confessed in the email)reading of private messages and the second is "hacking" someones e-mail to try and blacken their name, both of which actions, IMNSHO, are despicable!!!
You have the best wishes and support of friends, both here and in RL
Micca