i. Under Post Certificate (UPC) - It is the certificate issued to the sender of a letter on payment of a nominal fee. It acts as evidence for the letter posted.
ii. Insured post - Under this special service, the sender can get his/her letter or parcel insured. In other words, the sender can protect himself/herself against any damage while the parcel is in transit.
iii. Poste restante - When the exact address of the receiver is not known to the sender, the letter is sent as poste restante where the postmaster of the local area takes care of the delivery.
iv. Speed post - It ensures a speedy delivery of letters or parcels (usually within 24 hours) from one place to another.