The MessageGuard Appliance can archive mail for your Google Apps account. These instructions cover what you need to do in Google Apps to route mail through MessageGuard. These steps should be done after you call us to setup the appliance to accept and route the mail for Google Apps. You should make sure that your DNS MX records are pointing to the Google mail servers (https://support.google.com/a/answer/174125?hl=en) when you are ready to implement this change. Also a day or two before making this change we suggest changing your current TTL for the MX record to 600 seconds or 10 mins so when you do change the MX record to point to Google the change will happen much quicker and mail will start flowing to Google with in 10 minutes.
Google Apps, MessageGuard Appliance