PayPal does not recognize US Post Office as valid
I would think twice about paying for anything with PayPal, they say the support fraudulent transactions but they do not. They do not accept USPS Tracking as valid proof of delivery. Nor do they leave you any way to dispute their bogus decessions.
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Read the complete post at http://blog.sbs-rocks.com/2011/10/paypal-does-not-recognize-us-post-office-as-valid/