Make the same exceptions for bulk rate as for robocalling; only charities and political ads (I don’t think there’s any easy way to flag ‘people you’ve had business with in the past’ as being vetted for bulk rate) get a free pass, and they have to provide their bona fides; all others pay cash - er, full rate. Alternately, just double the cost of bulk rate, or other appropriate raise. I can’t think of the last time we heard of that happening (eta: I looked it up: 1996!)
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