OK, FINALLY! Here's what has happened:
The FM Big Guns have gone home, but didn't leave me much in the way of helpful information. Still not knowing what to do, out of desperation I deleted ALL rules for the offending address. Now my commercial account is working again. I am getting emails at that address now. I'm not sure that's a real good idea; it sort of feels like not locking the back door at night.
I just really, really didn't want to leave FastMail.
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