To configure additional settings of SPF 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 SPF 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 SPF authentication of mail senders section, do one of the following:
Select the check box next to the name of the Consider SPF softfail as a violation if you want Kaspersky Secure Mail Gateway to consider an SPF softfail error detected during SPF authentication as a message authentication violation.
Clear the check box next to the name of the Consider SPF softfail as a violation if you do not want Kaspersky Secure Mail Gateway to consider an SPF softfail error detected during SPF authentication as a message authentication violation.
Click the Apply button in the lower part of the workspace.