What is one of the primary considerations when sorting international mail?

When sorting international mail, one of the primary considerations is customs regulations and documentation. This is crucial because international mail must comply with the laws and regulations of both the sending and receiving countries. This includes proper labeling, declaration of contents, and adherence to restrictions on certain items.

Understanding customs regulations ensures that mail can pass through international borders without delays or issues, which may arise if the necessary documentation is not included or if the items violate regulations. This necessitates the collection of various forms and adherence to specific guidelines, making this consideration fundamental in the international mailing process.

Other aspects, such as postal rates, packaging aesthetics, or delivery times, are important but secondary to ensuring that mail can clear customs and reach its destination without complications.