Configuring DKIM Authentication Settings | Trend Micro Service Central

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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 continues to the next step in the message delivery process.

Procedure

Go to Administration → Sender Filtering/Authentication → DKIM Authentication.
Select Enable DomainKeys Identified Mail (DKIM) authentication.
To add verification result into the message header, select Insert X-Header into email messages.
To fail DKIM authentication for emails without DKIM signatures, select Fail verification for emails without DKIM signatures.

Select the maximum number of signatures to verify in a message.

Important

If a message has 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 might require more processing load.

Specify the sender domains to verify.
- To verify DKIM signatures in messages from all sender domains, select All.
- To verify DKIM signatures in messages for specific sender domains:
  1. Select Specify sender domains.
  2. Specify a domain.
  3. Click Add.
  Tip
  
  To remove a sender domain from the list, select the entry and click Delete.
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.
Click Save.

Keywords: authentication settings