Configuring DKIM Authentication Settings

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 Administration > Sender Filtering/Authentication > DKIM 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.