After partition, the exchange of mails between India and Pakistan continued as it was before partition, but it was not smooth. Therefore from 1st November 1947, Offices of Exchange for Surface Mail, for Accountable Articles became Delhi for Lahore and Mcleodganj, Jodhpur for Hyderabad Sind and Bombay for Sea Mail to Karachi, for West Pakistan. Calcutta, Maldah, Jalpaiguri, Cooch Behar, Golakganj, Silchar, Agartala and Katihar for East Pakistan (Dacca).

Ordinary Mail including Registered & Unregistered Articles will be exchanged directly by Offices and Sections in India, in closed bags, vide DGPO Circular No.38 dated 31st October 1947. Dead Letter P. O. of India will directly deal with D. L. O., of Pakistan vide DGPO Circular No.47 dated 1st December 1947.

It appears that Air Mail to and from Pakistan was carried by Air India?s Karachi - Madras Air Service. But from 26th January 1948, Air Mail from Pakistan will be despatched for India only through Orient Airways thrice weekly service between Karachi - Calcutta and by BOAC Service between Karachi - Delhi. Air Mail from India to Pakistan remain unchanged. The Postal Rates remained same, as it was prevailing before 15th August 1947 (Inland Postal Rates) vide Postal Notice No.56 dated 26th January 1948.

With effect from 1st April 1948, Pakistan will be treated as a foreign country for the exchange of postal traffic, vide Postal Notice No.66 and No.67 dated 29th & 30th March 1948 respectively. The main terms and conditions for delivery of postal articles in Pakistan will be as follows:

A) Letters, Single & Reply Paid Postcards, Printed Papers, Business Papers, Sample Packets, & Blind Literature Packets will be dealt as prescribed in Section III of the Indian P & T Guide.

B) Articles liable to Custom Duty will be dealt as per Clause 206 of the P & T Guide.

C) Registration, Express Delivery, Business Reply System, Money Order, Value Payable Post, Insurance and Parcel Services will be available as per terms of Indian Inland Service and as prescribed in P & T Guide. Prepayment of Postage is compulsory.

The Postal Rates will be as follows:
1) Letters 3? as., for 1oz., + 2 as., for every additional 1oz.
2) Postcard 2 as., for Single and 4 as., for Reply.
3) Printed Papers 9 pies for every 2oz.
4) News Papers Inland Postal Rates will be apply.
5) Business Papers 3? as., for a weight not exceeding 10oz., and for every add. 2oz., will be 9 pies.
6) Sample Packets 1? as., for 4oz., + 9 pies for every additional 2oz.
7) Blind Literature Packets ? anna for every 2? Lbs.
8) Business Reply System The postage recoverable from the addressor on foreign postal rates.
9) Insurance 5? as., per Rs.200/-.
10) Acknowledgment 3 as., per article.
11) Money Order, Air Mail MO, Telegraphic MO will be treated in same manner as of Burma.
12) Value Payable Post articles will be dealt as of other foreign countries.

13) Postal Order issued before 31st March 1948 will be paid till 30th September 1948. No Postal order will be accepted after 31st March 1948.
14) Air Mail Postal Rates inclusive of Postage will be as follows: Letters 6 as., per ?oz. (3? as + 2? as) Postcards 3 as each (2 as + 1a)

The above Postal Rates were reduced on and from 15th May 1948. The Indian Inland Postage Rates would apply on all classes of Postal Articles sent from India to Pakistan, except Business Reply Envelopes and Cards, which were not allowed to be exchanged between the two countries and Parcel Service would remain by registration only, vide Postal Notice No.13 dated 13th May 1948. The Air Mail charges were also reduced and the new rates were as follows:

1) Letters and Packets 1?as per tola or part in addition to ordinary postage 1?as + 1?as = 3as.
2) Post Cards 9 pies per card in addition to ordinary postage 9p + 6p = 1?as.
3) Money Order 1?as per Money order in addition to the ordinary MO Commission.

The above rates of Air Mail again confirmed by Postal Notice No.46 dated 25th October 1948.

Postal rates from 1st April 1949 for Pakistan again changed due to revision in Inland Postal rates of India. Air Mail fee remained same. Therefore by Air Letter or Packet will be 2as + 1?as = 3?as, Post Card will be 9pies + 9pies = 1?as and MO will be 1?as irrespective of amount.

When Air Letter (Aerogramme) service was introduced to various foreign countries on 1st September 1950, the Air Mail rates for Letter Mail, Post Cards, Packets etc. were also revised. But the Air Mail fees for Pakistan remained same. For Letters 3?as (2as Inland postage + 1?as Air Mail fees), for Post Cards 1?as (9pies + 9pies) and for Aerogramme 3as (1?as + 1?as).

The Airmail registered letter with Acknowledgement posted from Sambhar Lake (Rajasthan) to Lahore dated 21st February 1949 with the total postage of 8?as. 

1?as Inland Postage Charges + 1? Airmail Fees + 4as Registration Charges + 1?as Acknowledgment  Charges =8? Total Postage (See the postage stamps affixed on front & back side of the envelope)