I get lots of junk mail on my address - people who try to open bank accounts, insurance, buying from catalogs, threats for debt collection (from agencies pursuing fraudsters)... So I'd be pretty annoyed if I ended up on a 'blacklist'.
Possibly your service might even be affected by the UK's defamation law.
(Incidentally, Langley Drive is about 15 minutes' walk from me!)
Im in the neighbourhood too, maybe its fate and we should work together on something in the future ;-)
Im trying to avoid the 'blacklist' thing, its a horribly aggressive approach. I wanted to create some visibility on delivery stats in the hope it weeds out anti social behaviour along with allowing the seller to be more selective about customers.
I dont think every buyer is worth servicing just because they are offering to pay you.
Possibly your service might even be affected by the UK's defamation law.
(Incidentally, Langley Drive is about 15 minutes' walk from me!)