In his final report in 1870 on the working of the system, as a result of which the establishment was permanently continued, the Director-General described the work of the sea post office as "embracing the sorting of mails for transmission to the various localities of a huge continent, as well as the checking of the accounts made out in respect of such correspondence by the various European offices from which the mails are received.... It is a work which, in an office on shore, would be distributed among a large establishment, each member of which would have to learn only a small portion of the business; and it is a work the bad performance of which even occasionally will give rise to the most serious consequences." The experimental formation of the sea-sorting office had succeeded so well that the inward overland mail was received at Bombay ready for despatch into the interior, instead of having to be detained there for about six hours, which often involved the loss of a whole day for certain places. The Bombay delivery ticket-holders got their overland letters at the post office window about ten minutes after the mail had arrived, and the delivery to Calcutta ticket-holders of letters, which had been sorted at sea, was similarly expedited.
The Indian sea-sorting office sorted letters for the United Kingdom, but the London General Post Office did not reciprocate by sorting the mail for India, the latter being done at sea, which enabled London to dispense with a large expenditure for Naval Agents. Although the revised contract with the Peninsular and Oriental Company provided for proper sorting accommodation on their vessels eastward of Suez, there was no similar provision westward of Suez; on the contrary, it was specially provided that the master or commander of the vessel should take charge of the mails to the west of Suez. The fact was that the work done by the Indian sea-sorting office on the homeward voyage was so complete and thorough that the British Post Office was able to abolish all its sea-sorting establishments west of Suez.
The steady growth in the work to be done and in the number of men required to cope with it gave rise to many difficulties in connection with the provision of suitable and adequate accommodation on board the steamers, the proper supervision of the staff, and the improvement of the service. The sorting arrangements had to be revised frequently, and the extent of the run, which, as stated above, was originally between Suez and Bombay, had in 1890 to be curtailed to the voyage between Aden and Bombay in consequence of the decision of the Peninsular and Oriental Company to tranship the outward and homeward mails at Aden every alternate week.
With the steady increase in the volume of the mails to be dealt with, it was found necessary to add to this staff considerably from time to time. In 1873 the total staff of the six sets comprising the "Marine Postal Service, Suez and Bombay," was raised to six mail officers, six assistant mail officers, six supernumerary assistant mail officers and twelve packers, i.e. five men for each set. When the journey was curtailed to the Bombay-Aden run the sets were reduced to three, but the number in each set had to be steadily increased until in 1908 it reached twenty-nine, consisting of an assistant mail officer, fifteen sorters and thirteen packers.
In the year 1899 a special inquiry, made in connection with a question asked in Parliament as to the effect of the introduction of Imperial penny postage on work in the sea post office, revealed the fact that the conditions of the service were very exacting on the staff. The extent to which the sorting of the mails could be done at Bombay or in the Railway Mail Service instead of at sea was very fully considered, and, although the Committee of postal officers convened at Bombay to examine the subject did not recommend the discontinuance of the existing arrangement, its retention was made conditional upon the adoption of a number of special measures to reduce the amount of work at sea.
A further inquiry into the conditions of service in the sea post office, instituted in the year 1905 in connection with a representation on the subject made to the Secretary of State for India by the late Mr. Samuel Smith, M.P., again brought into prominence the fact that the work had to be performed in circumstances of a peculiarly trying nature. It also established that, owing to the rapid increase, at the rate of 10 to 12 per cent a year, in the volume of the mails, the question of arranging for the sorting work to be done on shore instead of at sea could not be deferred much longer. This growth was bound to involve further additions to the staff from time to time, while the accommodation which it was possible to secure for the work, especially on board the through mail steamers, was strictly limited.
The subject of abolishing the sea post office altogether, or, at least, of restricting it to very small proportions, was again taken up in 1907, as the Postmaster-General, Bombay, reported that the service could not be placed on a proper footing without the provision of much more accommodation on board the through steamers, and expressed the opinion that the time had come for considering whether it was not possible to have most of the work of sorting done on shore.
By the end of 1908 the volume of the mails had become so large and the difficulty of dealing with them on board so great that a radical change was needed. The question of having the sorting work done on shore was, therefore, fully examined again with the Postmaster-General, Bombay. The position at the time was as follows: The mails for India despatched from the United Kingdom were received by the Aden-Bombay sea post office partly sorted for the various territorial divisions of India, and partly unsorted. The unsorted portion, which amounted to about 40 per cent of the total, consisted of the articles of all classes posted or received in London late on Friday evening, which the London General Post Office did not sort before despatch. The Indian mails from countries other than the United Kingdom were received by the sea post office wholly unsorted. With the exception of trade circulars and price lists, all the unsorted mails received were dealt with by the sea post office between Aden and Bombay. The average number of the unregistered letters, postcards, newspapers, packets of printed papers, and samples which had to be sorted by the sea post office on each voyage from Aden to Bombay was 150,000 and, in addition, some 7000 registered articles had to be specially treated and about 6000 unpaid articles examined and taxed with postage. This work had to be performed under very trying conditions and, during the monsoon season especially, the staff was hard pressed to finish the sorting before the steamer reached Bombay. The accommodation for sorting the mails provided on the through mail steamers was becoming less and less adequate as the volume of the mail increased and no additional space could be obtained.
The proposal to meet the situation by again extending the run of the sea post office to Port Said or Suez had to be negatived owing to the transhipment at Aden on alternate weeks. Moreover, it was undesirable to resort to a measure of this kind, as, quite apart from the large additional expenditure involved in return for insufficient advantages, the difficulty of keeping the staff under close and constant supervision was becoming more pronounced. In fact, this difficulty of exercising proper supervision over the enormous volume of work at sea furnished in itself a very strong argument in favour of having the work of sorting and dealing with these important mails done entirely on shore.