As a buyer and seller on ebay. I will only pay/accept payment through paypal. I haven't had that many issues. However, craigslist is a little different story... If someone wants to buy something and have it shipped, I'd make sure you talk to them on the phone first. An email can come from any country, but speaking american english isn't something that can be faked. If they have a US based PayPal account with a Verified Address, I'd say you're gtg. But you can always call PayPal CS to ask about the buyer. There is also a place to add the tracking number of the item being shipped as well. I'd ship with a real courier and not with the USPS, they don't have real tracking or good insurance... Which of course always depends on the value of the item; a $100 item is always covered by default. Just make sure you purchase more if you need it.