Steinberg has moved toward a centralized "Steinberg ID" ecosystem. Temp mail services are often blacklisted by major corporations. Steinberg’s servers frequently detect domains commonly associated with disposable email services (e.g., @mailinator.com , @guerrillamail.com ) and block registration attempts immediately.
Steinberg, like many software companies, offers a free trial of Cubase—usually lasting 30 to 60 days. This allows potential buyers to test the software’s capabilities before committing to a purchase that can range from $100 to $600. temp-mail-cubase
Quick note on why users search for “temp mail + Cubase” and the practical issues. Steinberg has moved toward a centralized "Steinberg ID"
For the aspiring producer trying to save money, using temp mail services to bypass licensing is fraught with risk: like many software companies