I set this up today and ran it. Not only did it catch this morning's bait, but 4 other messages that came in previously that I didn't bother reporting. 😂
My company uses KnowBe4 (huh?) for this, but just "X-PHISH-CRID" and "X-PHISHTEST" headers, so the rule already matches.
X-PHISHTEST: This is a phishing security test from KnowBe4 . . .