Spam blockers are disabled. I double checked. When I tried to change to another e-mail address/server, the ETO screen kept giving an error that the password was incorrect. Entered it twice, same result. I then went to that e-mail provider and was able to log on using the ETO-rejected password.
Edit: Part of the riddle is solved. The change password dialog at ETO asks for the email address and "current password." Since I knew I was signed onto ETO, I entered the email password. That was accepted for the current e-mail address, but not for my new one. Why? Anyway, I used my ETO password to change e-mail addresses and we will see what happens.