I’ve thought about this a lot.
The resolve is the these error emails should not follow current filters (should not be prefixed with the email_prefix. (We don’t want them filtered away, since the emails didn’t work.)
Emails such as Email rejects already come from a different address, and [probably] don’t have the message header such as list:"category.site-fqdn"
A better plan might be to call attention to the email with a subject line prefix like [Notice] or [Action Required]