Can Cox tell me who accessed my e-mail account without my knowledge or consent?

Somebody accessed my e-mail account yesterday and forwarded a very personal e-mail to a third party without my consent or knowledge.

Is there anyway Cox can tell who or where my account was accessed from?

This e-mail was forwarded @ 4:34 am and even has a message in the body so somebody sent it and wrote a message alone with it.

This is a very serious issue for me as somebody logged onto my account, found an e-mail with very personal and sensitive information in it and forwarded it to a third party without my consent or knowledge and would like to know who or where it was done from.