You can remove the redirect (thus setting your @pepperdine.edu email account back to its default Pepperdine location) by following nearly the same steps you used to redirect your @pepperdine.edu email account to the Google Apps for Pepperdine Gmail account:
In 15 minutes or less, your @pepperdine.edu email account will point back to its original Pepperdine location.
You can continue to access any messages that went into your Pepperdine Gmail account (during the time you had your @pepperdine.edu email redirected) by directly logging in at http://google.pepperdine.edu.
Get more help from the IT Help Desk at 1-310-506-HELP (4357).