Linux Network Administrators Guide
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Chapter 17. Electronic Mail
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17.3. Email Addresses
Email addresses are made up of at least two parts. One part is the name of a mail domain that will ultimately translate to either the recipient's host or some host that accepts mail on behalf of the recipient. The other part is some form of unique user identification that may be the login name of that user, the real name of that user in "Firstname.Lastname" format, or an arbitrary alias that will be translated into a user or list of users. Other mail addressing schemes, like X.400, use a more general set of "attributes" that are used to look up the recipient's host in an X.500 directory server.
How email addresses are interpreted depends greatly on what type of network you use. We'll concentrate on how TCP/IP and UUCP networks interpret email addresses.
17.3.1. RFC-822
17.3.2. Obsolete Mail Formats
17.3.3. Mixing Different Mail Formats
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