TLS Encryption is a protocol used to encrypt email while in transit between mail servers. The following tests check a domain to see if it has the capability to receive email in encrypted form from other mail servers (inbound email). A FAIL result means that domain/mail server will NEVER accept encrypted email. A PASS result means that the server can receive encrypted email if it is also supported by the sender. A PASS result does NOT mean that all incoming email will be encrypted. This test does NOT check the encryption capability of email that is sent by that server to other servers (outbound email).

View list of common domains and their encryption status.

Learn how to setup TLS Encryption for Exchange or Postfix servers.