Despite reading similar support recommendations, Thunderbird V91.10.0 will not accept my passwords. I have three email accounts that I'm using with TB, and have used the same passwords for years. Now the program will not accept the passwords. Specifically, I cannot send outgoing mails. Incoming mails do arrive, but not the outgoing ones. When trying to send an email, I get this message: "Log-in to server smtp.googlemail.com with user name [email address inserted here......@gmail.com] failed." Then, options for 'Retry' or 'Enter new password'. If I try to enter/create a new password, still it is not accepted. If I persist, I get this:"Sending of the message failed. Unable to authenticate to Outgoing server (SMTP) smtp.googlemail.com. Please check the password and verify the 'Authentication method' in 'Account Settings | Outgoing server (SMTP)'. In Server settings/Authentication method, I tried switching from 'Normal password' to '0Auth2', but still the same problem. Can anyone help with this? I'm lost....