Your domains must be registered to the Trend Micro
Encryption Email service for email encryption to work. See Registering Domains to the Encryption Service for more information.
After configuring encryption settings, IMSS can
decrypt and encrypt the messages to protect the message content.
For encrypted message traffic entering your network, IMSS
decrypts the messages automatically and scans the messages according to the policy
rules
you specify. Outgoing messages are re-encrypted after scanning to protect the message
content.