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...and now that I have a definitive error message from a user log, I may be able to get it corrected through the ISP.
I summarized the log entries in my post, but if you need the complete entries I will be happy to send them.

Meanwhile, I'm changing my account's email address to Gmail, in hopes that I can get mail from the forum. I could easily turn off "domain name checking" on my mail server, but 1) there's no reason a sender's domain should not have a valid DNS entry, and 2) it's stopped a TON of incoming spam at the connection level rather than via filtering. The only "false positives" occur when a sender's server is misconfigured.

Jack