You received an e-mail that your order failed to be delivered?
Maybe a postman has left a notice. Please find the notice. It includes information about post office to pick up your package.
You can't find the notice. Don't worry about it.
1) If your tracking number contains 'KR',
Please contact your local Post service and ask them to track it. They will let you know where you pick up the package.
2) If your tracking number doesn't contain 'KR',
Please contact us. email@example.com