Sounds like you have the Contact extension installed. With that installed and active the email address will not be displayed.
Which version of the Contact extension do you have? I just released an update yesterday, version 1.2, that fixed a bug which would cause email not to send. If you are experiencing this bug you would get a message stating; “You filled out a form field that was created to stop spammers. Please go back and try again or contact the site administrator if you feel this was in error.”