Their main contact e-mail can already be unsubscribed but you can try extra emails (after +) like user+spam@company.com Those often arrive to user's inbox but b

Their main contact e-mail can already be unsubscribed but you can try extra emails (after +) like user+spam@company.com Those often arrive to user's inbox but behave like a different address in their spam database. And of course, as others suggested, you can also subscribe sales, hiring, website staff, abuse@ and other departments.