I need to see who is accessing my e-mails! from computers, phones etc.?

my husband whom i am currently divorcing and have been seperated from for months has been recieving my e-mails either sent to his phone or is brilliant with guessing my changed pwords. I need help from yahoo now for illegal activity from him. a no contact and protective order have been issued with him and NONE of my emails should be accessed by him!!! do not give me a response in my mail box he will see it!!!!! please contact me on my heidi hunt landline telephone with my address listed as the same on my account info @801-253-1568 or my cell phone listed under hunt drywall inc. @801-502-3778