Question: What tribe did the wife of the person who first brought postal service to Umayyad lands belong to?

Knowledge 1: Umayyad Caliphate
Mu'awiyah introduced postal service, Abd al-Malik extended it throughout his empire, and Walid made full use of it. The Umayyad Caliph Abd al-Malik developed a regular postal service. Umar bin Abdul-Aziz developed it further by building caravanserais at stages along the Khurasan highway. Relays of horses were used for the conveyance of dispatches between the caliph and his agents and officials posted in the provinces. The main highways were divided into stages of 12 miles (19 km) each and each stage had horses, donkeys or camels ready to carry the post. Primarily the service met the needs of Government officials, but travellers and their important dispatches were also benefitted by the system. The postal carriages were also used for the swift transport of troops. They were able to carry fifty to a hundred men at a time. Under Governor Yusuf bin Umar, the postal department of Iraq cost 4,000,000 dirhams a year. [SEP] Knowledge 2: Umayyad Caliphate
With limited resources Muawiyah went about creating allies. Muawiyah married Maysum the daughter of the chief of the Kalb tribe, that was a large Jacobite Christian Arab tribe in Syria. His marriage to Maysum was politically motivated. The Kalb tribe had remained largely neutral when the Muslims first went into Syria. After the plague that killed much of the Muslim Army in Syria, by marrying Maysum, Muawiyah started to use the Jacobite Christians, against the Romans. Muawiya's wife Maysum (Yazid's mother) was also a Jacobite Christian. With limited resources and the Byzantine just over the border, Muawiyah worked in cooperation with the local Christian population. To stop Byzantine harassment from the sea during the Arab-Byzantine Wars, in 649 Muawiyah set up a navy; manned by Monophysitise Christians, Copts and Jacobite Syrian Christians sailors and Muslim troops.
Knowledge 1: Umayyad Caliphate
With limited resources Muawiyah went about creating allies. Muawiyah married Maysum the daughter of the chief of the Kalb tribe, that was a large Jacobite Christian Arab tribe in Syria. His marriage to Maysum was politically motivated. The Kalb tribe had remained largely neutral when the Muslims first went into Syria. After the plague that killed much of the Muslim Army in Syria, by marrying Maysum, Muawiyah started to use the Jacobite Christians, against the Romans. Muawiya's wife Maysum (Yazid's mother) was also a Jacobite Christian. With limited resources and the Byzantine just over the border, Muawiyah worked in cooperation with the local Christian population. To stop Byzantine harassment from the sea during the Arab-Byzantine Wars, in 649 Muawiyah set up a navy; manned by Monophysitise Christians, Copts and Jacobite Syrian Christians sailors and Muslim troops. [SEP] Knowledge 2: Punjab, Pakistan
The Punjabis followed a diverse plethora of faiths, mainly comprising Hinduism[citation needed] , when the Muslim Umayyad army led by Muhammad bin Qasim conquered Sindh and Southern Punjab in 712, by defeating Raja Dahir. The Umayyad Caliphate was the second Islamic caliphate established after the death of Muhammad. It was ruled by the Umayyad dynasty, whose name derives from Umayya ibn Abd Shams, the great-grandfather of the first Umayyad caliph. Although the Umayyad family originally came from the city of Mecca, their capital was Damascus. Muhammad bin Qasim was the first to bring message of Islam to the population of Punjab.[citation needed] Punjab was part of different Muslim Empires consisting of Afghans and Turkic peoples in co-operation with local Punjabi tribes and others.[citation needed] In the 11th century, during the reign of Mahmud of Ghazni, the province became an important centre with Lahore as its second capital[citation needed] of the Ghaznavid Empire based out of Afghanistan. The Punjab region became predominantly Muslim due to missionary Sufi saints whose dargahs dot the landscape of Punjab region.
Knowledge 1: Umayyad Caliphate
Mu'awiyah introduced postal service, Abd al-Malik extended it throughout his empire, and Walid made full use of it. The Umayyad Caliph Abd al-Malik developed a regular postal service. Umar bin Abdul-Aziz developed it further by building caravanserais at stages along the Khurasan highway. Relays of horses were used for the conveyance of dispatches between the caliph and his agents and officials posted in the provinces. The main highways were divided into stages of 12 miles (19 km) each and each stage had horses, donkeys or camels ready to carry the post. Primarily the service met the needs of Government officials, but travellers and their important dispatches were also benefitted by the system. The postal carriages were also used for the swift transport of troops. They were able to carry fifty to a hundred men at a time. Under Governor Yusuf bin Umar, the postal department of Iraq cost 4,000,000 dirhams a year. [SEP] Knowledge 2: Punjab, Pakistan
The Punjabis followed a diverse plethora of faiths, mainly comprising Hinduism[citation needed] , when the Muslim Umayyad army led by Muhammad bin Qasim conquered Sindh and Southern Punjab in 712, by defeating Raja Dahir. The Umayyad Caliphate was the second Islamic caliphate established after the death of Muhammad. It was ruled by the Umayyad dynasty, whose name derives from Umayya ibn Abd Shams, the great-grandfather of the first Umayyad caliph. Although the Umayyad family originally came from the city of Mecca, their capital was Damascus. Muhammad bin Qasim was the first to bring message of Islam to the population of Punjab.[citation needed] Punjab was part of different Muslim Empires consisting of Afghans and Turkic peoples in co-operation with local Punjabi tribes and others.[citation needed] In the 11th century, during the reign of Mahmud of Ghazni, the province became an important centre with Lahore as its second capital[citation needed] of the Ghaznavid Empire based out of Afghanistan. The Punjab region became predominantly Muslim due to missionary Sufi saints whose dargahs dot the landscape of Punjab region.

Answer: Kalb