Artikel 11

1. Closed letter-post mails may be exchanged through the intermediary of the land, sea or air services of other countries:
1.1 between the post offices of any member country and the commanding officers of military units placed at the disposal of the United Nations;
1.2 between the commanding officers of such military units;
1.3 between the post offices of any member country and the commanding officers of naval, air or army units, warships or military aircraft of the same country stationed abroad;
1.4 between the commanding officers of naval, air or army units, warships or military aircraft of the same country.
2. Letter-post items enclosed in the mails referred to under 1 shall be confined to items addressed to or sent by members of military units or the officers and crews of the ships or aircraft to or from which the mails are forwarded. The rates and conditions of dispatch applicable to them shall be fixed, according to its regulations, by the designated operator of the member country which has made the military unit available or to which the ships or aircraft belong.
3. In the absence of special agreement, the designated operator of the member country which has made the military unit available or to which the warships or military aircraft belong shall be liable to the designated operators concerned for the transit charges for the mails, the terminal dues and the air conveyance dues.