Business and diplomatic messages were handled by the service equally. Well organised, it had its own  post-horses that were used exclusively for the letter service; at each stop the time of the receipt and dispatch of the post-bag was written upon the face of each letter.
The postal service handled both business and diplomatic messages with equal efficiency. It employed a well-structured system where specialized horses were solely used to deliver letters, and the arrival and departure times for each letter were meticulously noted on the envelopes.