What do you mean by relays? Do you want email that you receive at an address hosted by Godaddy to be sent to another email address or do you want to pull email hosted at Godaddy to a client such as Gmail (which I do)?
Technically a relay is a way to send mail from a server that doesn't have an email system. I used relaying on my GoDaddy servers to go from an academic web server to send email for purposes of resetting passwords. There is no post office functionality.