I have used thunderbird with 5 gmail accounts for many years but now 4 of these accounts will not send emails. I have changed outgoing server to OAuth2 as sugested.If i setup a new email account with the same settings on it works fine. I am using POP and if I make an account with IMAP it also works fine but then I loose all my old emails. If I setup Thunderbird on another computer and import my profile it will still only send emails with 4 of the 5 email accounts Please help