How can a Salesforce admin restrict non-commercial email sending to only billing and support representatives?

The correct answer highlights the use of both setting the 'Email Opt Out' checkbox on Contact records and enabling Email Privacy Settings using the Individual object to effectively manage email permissions for non-commercial purposes.

Setting the 'Email Opt Out' checkbox on Contact records allows the admin to specify whether a contact has opted out of receiving any marketing or non-essential emails. By opting out, the contact is protected from receiving communications that are not crucial, such as promotional content, but still permits essential messages from billing and support representatives.

Enabling Email Privacy Settings using the Individual object provides an additional layer of control over the communication preferences for individual users. This feature is useful in managing how specific contacts receive email correspondence, ensuring that sensitive or non-commercial emails comply with privacy requirements.

Together, these strategies ensure that non-commercial email communications are restricted appropriately, limiting these communications to the necessary personnel while protecting user preferences effectively. Thus, the combination of both methods enforces a robust privacy policy within the organization, allowing for responsible and compliant email practices.