[stunnel-users] cannot unsubscribe. I want to unsubscribe

I can't unsubscribe from the list, I want to unsubscribe I enter my email address it wants a password. I enter one it says Illegal email address. I don't remember any password. I click Remind, and it still says Illegal email address https://www.stunnel.org/cgi-bin/mailman/options/stunnel-users