Explanation
This setting allows the consultant to verify the sender's identity and configure the incoming email settings.
Reference: https://help.salesforce.com/articleView?id=mc_es_sap_overview.htm&type=5 To redirect its emails to Marketing Cloud servers for processing, Northern Trail Outfitters should use a Sender Authentication Package. A Sender Authentication Package is a feature that allows marketers to authenticate their email sends with their own domain and branding, instead of using Marketing Cloud's default domain and branding. This will improve email deliverability and reputation, as well as provide more control over email settings andpreferences.
References:https://help.salesforce.com/s/articleView?id=sf.mc_es_sender_authentication_package.htm&type=5