Why is Thunderbird being blocked from logging in to my email accounts? I got an email from gmail, when I tried to set up my first account. It prompted me to lift a restriction, to allow the app access. I did as the tutorial suggested, changed the setting, tried again, and that worked. I have not had any such luck with my Care2.com or Riseup.net accounts. The error messages indicate that my username or password is wrong, but that is not the case. I have tried several times, even changing my password, refreshing everything, and trying again with the new password, that is clearly logging me successfully into my account. What more can I do?