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The Postal Administrations of neighboring countries, or countries able to correspond directly with each other without using the intermediary of the services of a third Administration, determine, by mutual agreement, the conditions of the conveyance of their reciprocal mails across the frontier, or from one frontier to the other.

Unless there be a contrary arrangement, the direct sea conveyance per-formed between two countries by means of packets or vessels depending upon one of them, shall be considered as a third service; and such conveyance, as well as any performed between two offices of the same country, by the intermediary of maritime or territorial services maintained by another country, is regulated by the stipulations of the following Article.