Cool, that's good to know. I thought it didn't when I'd earlier tried it? Or maybe "it depends" ... e.g. "spam" rule/content vs. "prohibited" content (prohibited attachment type, or, egad, a URL with a prohibited ending extension).
In any case, I've still work to do on rule tweaking to reduce some false positives. :-/ Oh well, with the "aggressive" rules, figured I'd hit at least some of 'em sooner or later.
From: "Rick Moen" rick@linuxmafia.com Subject: Re: Mail delivery failed: returning message to sender Date: Thu, 17 Aug 2017 06:43:55 -0700
Just checked, and adding 'verified-27440-' _did_ work.