Where to deal with this you have to first log into the domains host account and then find of the page in which you have to update the domains DNS records. In the next step you have to locate the MX records for the domain you are using. Now you have to update theMX record by entering the correct values in order to point to Googles’s mails. You have to delete all those records which are not pointing to Google servers. You have to wait until the changes take place and this might take at least 72 hours.