The postal system is a worldwide network used
to deliver mail. Every country has its own postal service. All of these
countries around the world have to collaborate to make sure every piece of mail
reaches its destination. The postal service is used by nearly everyone in the
Mail can be separated into two types - domestic and international. Domestic
mail is exchanged between people in the same country, and international mail is
exchanged between people in different countries. International mail can only be
delivered with the cooperation of two or more countries.
When you send a letter or a package, it is taken to a post office. At the
post office, all of the mail has to be sorted so that it can go to the correct
destination. Much of this process is now handled with modern machinery. The mail
is first separated into piles of letters and packages, sorted by class, and the
stamps are canceled. It is then sorted into groups of mail heading to the
same destination or direction.
Low class mail will be sent by the cheapest transportation, such as ground or
sea. This low class mail will sit around for long periods of time so that enough
of it can be collected to ship in bulk loads. High class mail will be delivered
faster, possibly by airplane, and will not wait as long between stops.
Along its journey, each piece of mail can be checked for security hazards in
a variety of ways. It could be as simple as a check for any odd-shaped
packages, or perhaps it could pass through an X-Ray machine. Any item
which poses a possible threat can be confiscated at the post office.
There are many modes of transportation used for delivering mail. Some
mail will be delivered by ground or sea transportation, and airmail will be sent
to the airport. At the airport, bags of airmail are loaded on to commercial
flights headed to the same destination as the mail. When the flight reaches
another country, it becomes the sole responsibility of that country to ensure
that the mail is delivered, and it is no longer in the hands of the country from
which it was sent.
The majority of all mail will travel through several post offices before it
reaches its final destination. For domestic mail, many countries use a postal
code, a series of numbers representing specific districts within the country.
These codes help to make the sorting process more mechanical and efficient.
When the mail reaches the last post office stop
before its final destination, it is sorted by a mail carrier and then delivered
during the daily routes.