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Ok, ok. Apple Mail actually changed the sender address a few times in sync with my tests confusingly enough. I sent roughly 10 test mails to OF and it consistently failed the ones with anything but subject-only.

After adding the address I missed in my me-card, I can no longer produce the problem.

I withdraw my comment. And I am happy it works (at least for me).

Would be nice if somehow the rule could indicate failure (by returning a false value from perform mail action on...?) and have the rule respond to that by leaving the message in INBOX instead of moving it to the archive folder or deleting it. This way I might loose messages.