The Costa Rican postal service, Correos de Costa Rica, said that new rules have been imposed on packages being shipped to the United States to conform with security rules there.
Packages being sent to Stateside addresses must be taken to the post office opened for inspection if they weigh more than a pound.
This includes standard mail and also package deliveries.
In addition those mailing the packages must provide adequate identification.
The postal services said that it would not ship substances prohibited by U.S. officials. That includes various sauces that are typical of Costa Rica.
In addition, those mailing such packages must provide detailed listings of the contents. Correos de Costa Rica said a description such as clothing was not adequate.
Also prohibited are ink cartridges and other liquids as well as flammable substances.