Procedure

1. Navigate to the Policy → Encryption Settings screen.
2. Click the Domain tab.
3. Click Add.
4. Add the domains you want to protect to the domain list.
   Domains can be manually typed or selected from a list of existing domains. Up to 10 domains can be added at a time.

   Note Domains and their sub-domains are treated as unique entries. Sub-domains must be added separately to the domain list. Wildcards cannot be used to include sub-domains. LDAP groups (entries starting with" LDAP") cannot be added to the domain list.

5. Click Save.
   A progress bar appears as the domain information is sent to the Trend Micro Email Encryption Server. A confirmation screen appears that verifies the domain information was received by the Trend Micro Encryption Server.
6. Read the instructions about what to do once you receive the verification key file.
7. Click Done.
   The domains appear in the Domain list on the Domain tab and a message about the Domain tab.
8. If you are the registered owner of the domain, reply to the confirmation message from the Trend Micro Encryption Server. The message is sent to postmaster@<domain> and webmaster@<domain>. When your domains are approved, you receive the domain ownership verification key file. You must reply to the confirmation message to prove that you are the owner of the domain.

   Note It may take one or two working days before you receive the key file to register the domain(s) to the encryption service. A key file is sent for each domain that is registered. If you do not receive a message within 3 working days, contact your sales representative.

9. Once you receive the key file, save it to a secure location.
10. Navigate to the Encryption Settings screen.
11. Click Browse and locate the key.
12. Click Upload.
    A confirmation message appears when registration completes successfully.