Paubox - Paubox provides HIPAA compliant email encryption without the hassle of extra steps.
Spark Mail - Spark helps you take your inbox under control. Instantly see what’s important and quickly clean up the rest. Spark for Teams allows you to create, discuss, and share email with your colleagues
Symantec Data Loss Prevention - Fully protect your data with the comprehensive detection technologies and unified policies of Symantec's industry leading Data Loss Prevention (DLP).
Newton Mail - Newton is a fully featured mail client available for Android, iOS, macOS and Windows.
Microsoft BitLocker - BitLocker is a full disk encryption feature included with Windows Vista and later.
Aqua Mail - Android Mail Client.