Only thing I can find on Ebay is
this but it doesn't fall under any of those four categories.
Except maybe this:
Electronic "scanned" coupons are not permitted on eBay -
all coupons sold through eBay must be physically delivered to the buyer, and may not be delivered by electronic means for home printing. Further, to reduce the potential for coupon abuse, eBay asks that sellers refrain from placing clear, unaltered scans of coupons in their listings that could be copied, printed and redeemed in stores. The sale of "scanned" or photocopied coupons may violate federal copyright laws, and sellers of such unlawful items could face prosecution under federal law. eBay will not tolerate such transactions through its site.
Guess you can't physically deliver a coupon that was sent via Email
