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Gmail checks for new messages every two minutes and updates the tally. Gmail saves a "conversation" of each original message and all replies. When you open a message, the newest in the conversation is on top with the rest stacked below. To read all the messages in the conversation, click...
According to Darwin Magazine: Prime Movers, the first email message was sent in 1971 by an engineer named Ray Tomlinson. Before this, you could only send messages to users on a single machine. Tomlinson's breakthrough was the ability to send messages to other machines on the Internet, using...