What Google Says:
Google email security and archiving services, powered by Postini, make your existing email system more secure and compliant. Beginning in 2013, Postini services will be transitioning to the Google Apps platform. Customers will continue to receive email security and archiving services for use with their existing email servers through the Google Apps platform and Google Apps Vault. Google will manage the transition for our customers and they will not have to replace existing email servers with Gmail.
Source: Google Postini
Why You Should Use It:
Who doesn’t want security for their business email services? Google provides a very secure environment for your email.