In ancient times, relay systems and runners delivered official mail over many miles. In the United States, as the population and geographic size expanded and literacy became the norm, there was a need for a mail delivery system. The establishment of the Post Office and development of a delivery mechanism formalized and greatly expanded the scope and speed of mail delivery. The most recent quantum leap in mail delivery has occurred because of the Internet, which has revolutionized the ways we communicate. E-mail allows us to send and receive information, documents, and images often in a matter of seconds. Our time management is more efficient since we can answer queries and receive responses in a prompt, yet convenient manner.