I have sold a few odds and ends to individuals in Canada. USPS and CPS (?) were slow but reliable.
My problem started with a small shipment to a forum member through Fed Ex. Apparently Fed Ex uses a third party for Canadian deliveries. A duty was due on the package and not collected at the time of delivery. Fed Ex has made several attempts to collect the duty and been ignored by the recipient. Now Fed Ex is expecting me to pay the duty.
The fact is that the recipient should do the correct thing and just pay the duty. But how can this be my responsibility? Is this normal? If so I just will have to exclude sales to Canada. It just is not worth the hassle.