Email-based attacks have long threatened organizations of all sizes. As more users migrate to cloud-based “email as a service” delivery models, so have the risks. In 2012 alone, firms sent an estimated 89 billion emails per day, and that total could rise to 143 billion per day by 2017. The paper also discusses how FireEye helps to reduce email-borne security risks while preserving the benefits of cloud based email services such as Microsoft Office 365 without forfeiting security. It is hard to imagine the modern business without email.”]
Source: https://www.bankinfosecurity.com/whitepapers/who-else-reading-your-emails-w-1816