Thunderbird was not the problem. There are vendors of IP blacklists for either users or ISPs with systems that spam, or are infected. Somehow, Sparklight ended up blacklisted. This should surprise no one. Lots of people spam for a living; I know one person who did for a couple years before his conscience got in the way. My mail host relies on the blacklist services. They whitelisted my IP. The problem persisted.
Somewhere within their SMTP server, my now legitimate emails were getting stored in the Sent folder and then quietly, without warning, discarded. I do not why, but they fixed it.
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