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Electronic mail (email) is one of the oldest and most widely used Internet services. It involves the exchange of digital messages among two or more Internet users. Every day billions of email messages are exchanged between users. Email service is supported by special servers that are called email servers. These servers accept, deliver, and store email messages in a store-and-forward operation. Email operation is quite simple. A user writes an email message, enters a recipient’s address, and relays it to the delivery service, which sends the message to the recipient user. The user can also attach files (of a certain size, depending on the email service) and send it to other users. Because email servers and individual accounts have been accessed by hackers, privacy concerns ...

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