Are outgoing emails in Zendesk encrypted to end-users?

Question

Are outgoing emails in Zendesk encrypted to end-users? 

Answer 

No, by default there is no encryption for email enabled. However, Zendesk Support has opportunistic support for Transport Layer Security (TLS), a cryptographic protocol for email exchanges. When not in use, ESMTP is used instead.

For more information on Zendesk's security features, see our page below:
https://www.zendesk.com/product/zendesk-security/