Every day, the citizens of the Internet send each other billions of e-mail messages. If you’re online a lot, you yourself may send a dozen or more e-mails each day without even thinking about it. Obviously, e-mail has become an extremely popular communication tool.
How does email work?
Network traffic like your email message is broken up into pieces called “packets “or “datagrams,” which have addressing information attached. They are moved through a LAN or the Internet to your recipient by network devices such as routers, bridges and gateways