This will depend on part on how it's being done. If there's a mandatory MDM app then a separate device is your answer. If it's via Exchange policies, a third pa

This will depend on part on how it's being done. If there's a mandatory MDM app then a separate device is your answer. If it's via Exchange policies, a third party email app (e.g. Nine, https://play.google.com/store/apps/details?id=com.ninefolders.hd3 https://play.google.com/store/apps/details?id=com.ninefolder...) will often let you control whether a policy is enforced at the device or application level.