Postal system in Kashmir

India has assigned an Indian "Postal Identification Number" prefix to Pakistan-Administered Kashmir, Pakistan in return has not reciprocated the gesture. India's postal service will not deliver mail to Pakistani-Administered Kashmir unless the Indian postal code and word "India" appears in the address, while Pakistan's postal service often refuses to handle mail that bears the word "India" on letter bound for Pakistani Kashmir. Hence, a complicated and unofficial system of delivery has evolved whereby most letters from India, or Indian-Administered Kashmir, that are bound for Pakistani Kashmir are actually sent to post-offices in Pakistan's Punjab province that are in close proximity to Pakistani Kashmir. Residents of Pakistani Kashmir will have notified the local Punjabi branch that they actually reside in Kashmir, but are simply maintaining a Punjabi postal address for convenience. Although it is illegal to do so, postal workers in those offices then unofficially forward the mail to post-offices in Pakistani Kashmir for pick-up. Important documents, on the other hand, are delivered to third parties in Dubai, who then re-address the mail to its destination in either Kashmir.
(From- wikipedia)