Unable to send mail in Thunderbird 102.6.1 (64 Bit)
In Thunderbird why do I receive an error message for an invalid Certificate or the following Error message. - Sending of the message failed. An error occurred while sending mail. The mail server responded: Authentication required. Please verify that your email address is correct in your account settings and try again. error message - Sending of the message failed. An error occurred while sending mail. The mail server responded: Authentication required. Please verify that your email address is correct in your account settings and try again.
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The error message seems rather clear. There is likely an error in your account setup. That's why the error appears. Possibly, if you post your account server settings, someone here may suggest an approach.