What are the customs requirements for sending mail internationally?

When sending mail internationally, customs requirements need to be considered. The US Postal Service requires certain documentation for customs clearance. These include a customs declaration form, such as PS Form 2976 or 2976-A, and may vary based on the content, value, and destination of the mail. The form should accurately detail the contents, quantity, and declared value of the items being shipped. Additional documents, such as invoices or licenses, may be needed depending on the nature of the goods. Restricted or prohibited items should be avoided. Regulations vary by country, and it is important to check specific requirements with the destination's customs authority. Failure to comply with customs requirements could result in delays or the return of the mail.