The bad guys would like nothing more than to break into your mail account, mine it for data and then use it for all sorts of bad behavior. That bad behavior can create havoc for you and can damage the reputation of our servers. And once your reputation has been damaged it can be difficult to repair.
The first thing we do to protect our reputation and you from the bad guys is geographic isolation. Most attacks originate from specific regions on the globe. We block those regions from being able to login to your mail account. Geographic isolation reduces attacks by about 90%. For the other 10% we monitor your mailboxes for any failed authentication attempts. If we detect a pattern of bad behavior we block access from those devices.
Maintaining a solid reputation is essential to providing a first class email service.