Forgot unique string
if you forgot the unique string Google generated for you at the time of your Google Apps setup. visit this url
Adding MX entries to Cpanel during setup.
- Log in to your cPanel account
- Click Mail
- Click Modify Mail Exchanger (MX Entry). A list of your current MX records will appear
- Click Change an MX Entry
- In the Change MX for… field, enter ASPMX.L.GOOGLE.COM
- Click Change.