Collecting
Stamps are also object of a particular form of collecting called philately, and often their commercial value on this specific market becomes enormously greater that the printed one, even after use.
Another form of collecting regards postcards, a document written on a single robust sheet of paper, usually decorated with photographic pictures or artistic drawings on one of the sides, and short messages on a small part of the other side, that also contained the space for the address. In strict philatelic usage, the postcard is to be distinguished from the postal card, which has a pre-printed postage on the card. The fact that this communication is visible by other than the receiver, often causes the messages to be written in jargons.
Letters are often studied as an example of literature, and also in biography in the case of a famous person. A portion of the New Testament of the Bible is composed of the Apostle Paul's epistles to Christian congregations in various parts of the Roman Empire. Other famous letters include:
A style of writing, called epistolary, tells a fictional story in the form of the correspondence between two or more characters.
A make-shift mail method after stranding on a deserted island is a message in a bottle.
Deregulation
Several countries, including Sweden (in 1991), New Zealand (1998 and 2003) and Argentina have opened up the postal services market to new entrants. In the case of New Zealand Post Limited, this included (from 2003) its right to be the sole New Zealand postal administration member of the Universal Postal Union, thus the ending of its monopoly on stamps bearing the name New Zealand.
Famous letters
List of national postal services