Alternatively, email filter to forward said mail to their CEO. This was my last resort for: from:(@ashampoo.com), as I got tired of sending my 10th unsubscribe

Alternatively, email filter to forward said mail to their CEO. This was my last resort for: from:(@ashampoo.com), as I got tired of sending my 10th unsubscribe request to their technical staff, support, ubsubscribing from their "official unsubscribe website", and marking every mail from them as spam.