New OAuth2 will not send emails error message is server can't authenticate Outgoing server
Thunderbird version 148.0.1 will not send outbound emails since updated to OAuth2. Error message is Unable to Authentic Outgoing server (SMTP) Email account will allow inbound mail , but will not send mail. Have worked through all published troubleshooting steps. Extremely frustrating!
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Who is the mail provider?
And please tell us, does something in https://support.mozilla.org/en-US/kb/thunderbird-and-yahoo help?