Sean advised Chuck,
| * Subject:[ ]*$
| Note that the above Subject condition says if the Subject header EXISTS,
| but is at most whitespace, nothing more. If you want an ABSENCE of a
| subject header altogether, replace that with:
|
| * ! ^Subject:
Or to catch messages with empty, null, or missing subject lines,
* ! ^Subject:.*[^ ]
where the brackets enclose caret, space, tab.
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