one-time signup email
https://atomic-wiki.win/index.php/How_Short-Term_Email_Services_Protect_Your_Privacy_Online
When I signed up for the service, I had to create an account with my email and password. That was the only time they ever asked for that info. Every time I come back, I just log in with those same credentials. No repeated registration forms, no re-entering my email, no extra verification for returning visits. It's just a one-time signup email, and then the account stays active, letting me access everything without hassle.