Site: USPS Add new comment Comments I cannot check out. Been trying for hours now. I keep getting this error messageWe are sorry but an unexpected error has occurred during the checkout process. Please try again later. reply Add new comment Your name * E-mail * The content of this field is kept private and will not be shown publicly. Comment * Notify me when new comments are posted y7Nkjx Enter the code above * Enter the code without spaces.