................Why the hell would you even send an e-transfer?
Face-to-face cash transactions only
If the person is located too far away; have him list the item on eBay and have it shipped to you. They'll be required to have a tracking number and if anything goes wrong; you can dispute it to PayPal/eBay and get your money back!
Sorry to sound harsh, but if you're sending e-transfers to people you don't know; you deserve to get scammed.