I am using Mail cofigured with my Cox account at home, and I can send and receive emails fine with no problems. However when I bring my laptop to work or bookstore, etc, I can only receive email but it will not send on Cox's smtp server as they dont allow relaying. I signed up for a Gmail account, and now with that I can reply to my Cox emails while at work on gmails smtp server, but the recipients will see my Gmail account. Is there a way to "hide" the gmail account so that the recipients will see my Cox address?