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security settings say "not Found" when trying to send emails. Why?

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I recently changed my password for BT mail and now I cannot send emails through Thunderbird, but can send via Bt mail. I am receiving emails okay in Thunderbird. Security box highlights while sending and status say outgoing address not found. Something has changed, but what? Help please.

I recently changed my password for BT mail and now I cannot send emails through Thunderbird, but can send via Bt mail. I am receiving emails okay in Thunderbird. Security box highlights while sending and status say outgoing address not found. Something has changed, but what? Help please.

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Please only create one question for each issue as it might cause issues with the continuity of a question. Keep all responses in the question at this link: https://support.mozilla.org/en-US/questions/1132479