Official letter mail posted at FPOs is deliverable free of postage within India and will be superscribed " On India Government Service", 'Free on Active Service' and will be franked by originators with the name, rank and official designation (if any) of the despatching officer.
Correspondence, which is not superscribed or franked by originators will be returned to Post Orderlies for supplying the omission.
Registration charges are; however, payable on Registered letter mail.
Charges on official articles will also be prepaid in ordinary postage stamps.
Official correspondence is to be cleared through SDS channels. However, articles addressed to stations not served by SDS or to addressees not entitled to SDS facilities will be accepted for despatch by FPOs.