What are mailing envelopes?
Mailing envelopes are most often used to enclose a correspondence that is to be sent through the postal system. A mailing envelope is usually made of folded paper and gummed on one flap, and there are hundreds of different envelopes to consider. They are available in assorted styles, including baronial, announcement, catalog, commercial, and booklet. There are also window envelopes that allow a portion of the contents to be revealed, usually the address. Sending a message encased in folded paper is a practice as old as the origins of paper itself. The earliest mailing envelopes were often a page written on one side of the paper, folded inward, and addressed on the backside. Known as letter sheets, they were sometimes sealed with wax. Before the advent of official post offices, a servant or an independent postal service usually delivered written messages. The first known mailing envelopes officially stamped by a government post office were sent in the year 1608. Before the industrial ag
