I was working with a company for past 6 months and the owner had set official email id on my personal phone. I have sent an resignation letter to him through my personal phone using official id. To my surprise I get threat email from him for stealing things from office (this he has done to many employees previously so they get scared). As i have resigned i didn't want to keep any office belongings with me so i wanted to deleted office email from my personal mail. But after the email exchange and mental stress he has given me that is in (black n white) in email. I would like to keep the official emails with me for any unforeseen situation if he creates in future.
Please give your suggestion: Is it fine to keep official email on personal mail or i should be deleting them completely? (I can't forward those email to my personal id as the server deny's it) So i can use these emails as a proof if things go wrong.