As you know many dealers use other services for mass email campaigns. Mailchimp, Constant Contact, etc etc etc. Currently if a customer unsubscribes via one of those tools, they would have to automatically be unsubscribed within the CRM. A mass unsubscribe capability within Drive would greatly assist in ensuring those are updated appropriately. The dealer should easily be able to provide a CSV or XLSX with appropriate emails for Drive to mass unsubscribe.