Vendors who don't have PGP are something I'd avoid like the plague, it shows they're either too lazy or don't know how to use it, either of which are traits of people I don't want to be working with. If he insists Privnote, then you yourself should insist PGP.To answer your question, SilkRoad deletes your address yes, but I don't know how they delete it whether with a single pass, multiple passes etc so it is possible that the information could be forensically recovered. Either way, you will be relying on SilkRoad to protect you and I think the philosophy of most users on this forum is that you should take measures to protect yourself and not leave it in the hands on the marketplace which could well be a honeypot for all we know (although it's highly unlikely, you can never be too careful).