One of the most popular applications on the Internet today is
electronic mail (email).All communication via TELNET is carried out through a
virtual device called Network Virtual Terminal (NVT).TELNET (TErminal NETwork) is an Internet protocol that allows
computer users to access computers from great distances (remote
login). Through a particular user interface, the user is able to
browse within the Web using a distinct URL (Uniform Resource
Locator).Every email message issued from within
the domain is first sent to the domain's mail server, which then
directs the message to its destination.The message stays in the
destination domain's mail server until the recipient requests to see
their incoming mail.The local part specifies a special file, called the user
mailbox, where all the incoming mail is stored for retrieval by the
user agent.It
establishes two connections between the linked devices: one for
data transfer and one for control information (commands and
responses).A client software application (Web
browser) resides on the user's computer and is responsible for
accessing information on the Web, and displaying it on the user's
device.The domain name illustrates the computer which
implements the specific SMTP server.