Configuring DKIM Authentication Settings Parent topic

Deep Discovery Email Inspector verifies DomainKeys Identified Mail (DKIM) signatures in incoming email messages and applies actions on messages that fail to pass signature verification. If a message's DKIM signature passes verification, the message will continue to the next step in the message delivery process.


  1. Go to AdministrationSender Filtering/AuthenticationDKIM Authentication.
  2. Select Enable DomainKeys Identified Mail (DKIM) authentication.
  3. To add verification result into the message header, select Insert X-Header into email messages.
  4. Select the maximum number of signatures to verify in a message.
    • If a message contains more than the maximum number of signatures you select, Deep Discovery Email Inspector terminates the DKIM authentication process for the message.
    • Selecting a larger number of signatures to verify may require more processing load.
  5. Specify the sender domains to verify. Select All to verify DKIM signatures in messages from all sender domains; otherwise, select Specify sender domains and complete the following steps to add sender domains to the verification list.
    1. Type a domain.
    2. Click Add.
    To remove a sender domain from the list, select the entry and click Delete.
  6. Specify the action to perform based on the verification result.
    • Bypass: Select this option to allow Deep Discovery Email Inspector to continue processing of the message.
    • Block temporarily: Select this option to temporarily block the message. The sender can send the same message to Deep Discovery Email Inspector to perform the verification again.
    • Block permanently: Select this option to permanently block the message. When a new message is received from the sender, Deep Discovery Email Inspector performs the verification again.
  7. Click Save.