Andrew thanked me (you're very welcome), but in his quote of my code I
noticed something suboptimal; I'd written,
4. This will catch mail with an empty subject or no subject line at all, but
a message with a subject consisting only of whitespace will slip through
(unless the whitespace is a single space after the colon and nothing more,
which I'm treating as equivalent to emptiness).
:0:
* ! ^Subject:.*(.+ |[^ ])
subjectisemptyormissing
Kill the plus sign there: it doesn't change the results, but it does make
the expression less efficient:
:0:
* ! ^Subject:.*(. |[^ ])
subjectisemptyormissing
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