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Can't send emails

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I've gone through the Thunderbird FAQs, and thought maybe it's about security settings; played the config editor game, and set it back to 1 (It was at 3). Still no luck. Spent half an hour with CSR at my ISP; they think it must be a Thunderbird problem. I can send from their webmail site, also from my yahoo and gmail addresses, but not from Thunderbird. Still receiving emails on Thunderbird. Attached outgoing server screenshot.

I've gone through the Thunderbird FAQs, and thought maybe it's about security settings; played the config editor game, and set it back to 1 (It was at 3). Still no luck. Spent half an hour with CSR at my ISP; they think it must be a Thunderbird problem. I can send from their webmail site, also from my yahoo and gmail addresses, but not from Thunderbird. Still receiving emails on Thunderbird. Attached outgoing server screenshot.
Attached screenshots