▶ 14.2 Internet Email
Internet email is perhaps the oldest of today’s widely used internet applications. Network email sporting an “@” sign originated in the early 1970s. Even though raw file transfers accounted for most ARPANET traffic during its history, email was the most familiar and useful ARPANET service to most users.
Although both the ARPANET and today’s internet are packet-oriented, email is message-oriented. The email system accepts and delivers each message as a single unit. If a message must traverse several email servers, the receiving server collects the entire message before sending it on to the next one.
Internet email standards fall into two categories:
Formatting standards: These describe the layout of an email message: ...
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