For most enterprises it is not enough to make sure their own email platform is secure. If their suppliers are not equally secure, they can be as vulnerable to criminal hackers and data leaks from human error as the weakest link in their supply chain. IBM famously issued a new set of BYOD policies that forbid employees to use a competitor’s cloud service (no more Dropbox, no more Carbonite, iCloud, etc.), to forward corporate email to private accounts. Many companies also require remote wiping capability on employee devices in case they are lost or stolen.”]
Source: https://www.csoonline.com/article/2132022/email-in-security-hot-seat-with-rise-of-cloud–byod.html