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With Email Encryption, Deep Discovery Email Inspector appliances encrypt messages using Trend Micro Indentity-Based Encryption (IBE). For example, when the domain aa.com is registered with Trend Micro for encryption and decryption and user1@aa.com sends a message with private information to user2@bb.com, Deep Discovery Email Inspector encrypts the message sent to user2@bb.com.
Tip:

Before using Email Encryption, Trend Micro recommends you configure Deep Discovery Email Inspector appliances to synchronize the system time with an NTP server to ensure standard time and date data.

Click the Sync to Registered Appliances toggle to enable or disable syncing of the Email Encryption settings to all registered Deep Discovery Email Inspector appliances.