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Electronic mail (email) is a worldwide digital communication system for exchanging written messages among computers using the Internet. Often dubbed the first “killer app” of the Internet due to its widespread adoption, it has proved to be a fundamental and enduring global form of connectivity for commercial, political, personal, and social purposes. Beyond its role in mass communication, the email address itself figures as a core method for establishing proof of identity online to sign up for many Internet-based services, including government agencies, telecommunication providers, social media, online shopping, and news and entertainment portals.

One of the great attractions of email is its vendor-neutral accessibility: As long as one has an email address, one can be in contact with anyone else with an address. This ...

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