Hazrat Qasim (may Allah have mercy on him) says that the Holy Prophet (peace and blessings be upon him) used to send messages through a messenger.

Hazrat Talha bin Yahya (may Allah have mercy on him) narrates that Hazrat Umar bin Abdul Aziz (may Allah have mercy on him) used to send messages through a messenger. One of his slaves allowed a person to ride on the postal mount without his permission. He (may Allah have mercy on him) called him and said: Do not part from him until you pay its price, then deposit its price in the public treasury (Bait-ul-Mal).

Hazrat Yahya bin Abi Kathir, may Allah have mercy on him, narrates that the Noble Prophet, peace and blessings be upon him, instructed his appointed leaders: When you send correspondence to me through a messenger, then send someone with a handsome face and a good name.

Hazrat Abu Ishaq’s (may Allah have mercy on him) father narrates that Hazrat Muawiyah (may Allah have mercy on him) wrote a letter to Hazrat Abdur Rahman bin Khalid (may Allah have mercy on him) instructing him to send Jarir to him with a message. So he (may Allah be pleased with him) sent him.