To configure additional settings of DKIM message authentication for a rule:
In the main window of the application web interface, open the management console tree and select the Rules section.
In the list of rules, click the link with the name of the rule to open the rule for which you want to configure additional settings of DKIM message authentication.
Select the Authentication of Mail Sender section.
Flip on the toggle switch next to the name of the Authentication of Mail Sender settings group if it is off.
In the DKIM authentication of mail senders section, do one of the following:
Select the check box next to the name of the Consider absence of DKIM signature as an authentication violation setting if you want Kaspersky Secure Mail Gateway to consider the absence of a DKIM signature of a message detected during DKIM authentication as a violation of the message sender's authenticity.
Clear the check box next to the name of the Consider absence of DKIM signature as an authentication violation setting if you do not want Kaspersky Secure Mail Gateway to consider the absence of a DKIM signature of a message detected during DKIM authentication as a violation of the message sender's authenticity.
Click the Apply button in the lower part of the workspace.