Thunderbird cannot send emails
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
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I have a feeling it is to do with credentials