Electronic mail is a method of exchanging
digital messages between computer users; Email first entered substantial use in
the 1960s and by the 1970s had taken the form now recognised as email check. Check Email
operates across computer networks, which in the 2010s is primarily the
Internet. Some early email systems required the author and the recipient to
both be online at the same time, in common with instant messaging. Today's validate email
systems are based on a store-and-forward model. Email servers accept, forward,
deliver, and store messages. Neither the users nor their computers are required
to be online simultaneously; they need to connect only briefly, typically to a
mail server, for as long as it takes to send or receive messages
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