Which antispam feature is utilized to give end users control to allow emails that are...

End user safelist is a feature that allows end users to specify email addresses or domains that they want to receive messages from, regardless of the spam verdict or action assigned by Cisco ESA. Messages from senders on the end user safelist are delivered to the end user’s inbox without any spam filtering.

References: User Guide for AsyncOS 15.0 for Cisco Secure Email Gateway, page 10-13.