Check for Email Encryption
Checking for a security on emails can be done easily within Gmail. Here are the two easiest ways to tell using Gmail. One uses Zix while the other is using an open industry stand
Transport Layer Security (TLS)
1. If you see a blue banner across the top reading "This message was sent securely using ZixCorp", means it was encrypted via Zix Encryption
2. Checking for TLS encryption