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Email header fields can be multi-line, and each line should be at most 78 characters long and in no event more than 998 characters long.
replacing previous experimental extensions, to allow UTF-8 encoded Unicode characters to be used within the header.
Field names and values are restricted to 7-bit ASCII characters.
Some non-ASCII values may be represented using MIME encoded words.
The history of modern Internet email services reaches back to the early ARPANET, with standards for encoding email messages published as early as 1973 (RFC 561).Electronic Mail (email or e-mail) is a method of exchanging messages between people using electronic devices.Email first entered limited use in the 1960s and by the mid-1970s had taken the form now recognized as email.RFC 3864 describes registration procedures for message header fields at the IANA; it provides for permanent and provisional field names, including also fields defined for MIME, netnews, and HTTP, and referencing relevant RFCs.Common header fields for email include: Note that the To: field is not necessarily related to the addresses to which the message is delivered.