Setting up your Gmail or Google Apps account using Google Sync on your iOS device has many advantages. One of the advantages is that you are able to receive push e-mail, calendar and contact updates. Google recently added some new features to its Google Sync solution for iOS users, one of which was the ability to choose which e-mail address sent e-mails appear to be from.
Before we begin, make sure you have your Google Apps or Gmail account set up using Google Sync on your iOS device. If you are unsure how to do so, read this post.