University faculty, staff, students, and affiliates may not transmit confidential data via email and or via email attachments unless the message and attachments are encrypted.
For transmission of email messages containing confidential data within the University's Google domains, encryption of these messages occurs with the integrated feature of Google Message Security policy-enforced TLS (Transport Layer Security). External encryption occurs either by policy-based encryption or the use of keywords added by the sender.
https://collaborate.vcu.edu/security-and-privacy/encrypted-mail/