Have an existing Gmail account that was working great for years with TB, now each time I try to open TB I get the error: Login to account ".......@gmail.com failed with three boxes with these options: Retry Enter New Password Cancel Retry gives same error as above Enter New passsword for .........@gmail.com is entered then OK (the correct password is there already) then same error as above!!! In the email server settings for setting up Gmail to work with TB the instructions say: Use the table below to update your client with the correct information. For help updating your settings, search your email client's Help Center for instructions on setting up IMAP. Incoming Mail (IMAP) Server imap.gmail.com Requires SSL: Yes Port: 993 Outgoing Mail (SMTP) Server smtp.gmail.com Requires SSL: Yes Requires TLS: Yes (if available) Requires Authentication: Yes Port for SSL: 465 Port for TLS/STARTTLS: 587 Full Name or Display Name Your name Account Name, User name, or Email address Your full email address Password Your Gmail password HOWEVER in the actual setup there the options for Security Settings are different than the instructions above: For Incoming Server Connection Security: None STARTLS SSL/TLS and for Authentication Method: Normal Password Encrypted password Kerberos/GSSAPI NTLM TLS Certificate OAuth2 and the same options apply to SMTP outgoing Server setup screens my port number settings are correct my emailname is correct the password is correct the account is setup as IMAP the server name is imap.gmail.com and the outgoing server name is smtp.gmail.com my security settings both incoming and outgoing servers are: for connection security: SSL/TLS for authentication Normal password There is NO option to choose "requires authentication:yes" as in the instructions to setup but unable to send or receive gmail thru thunderbird Please help what option under security and authentication works? for both incoming and outgoing servers? Thank you