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The format of an email address is local-part@domain, where the local-part may be up to 64 octets long and the domain may have a maximum of 255 octets. [5] The formal definitions are in RFC 5322 (sections 3.2.3 and 3.4.1) and RFC 5321—with a more readable form given in the informational RFC 3696 (written by J. Klensin, the author of RFC 5321) and the associated errata.
Internet Message Format: RFC 196, RFC 772, RFC 821, RFC 822, RFC 2821, RFC 2822, RFC 5321, RFC 5322 Simple Network Management Protocol: RFC 1067, RFC 1098, RFC 1157 (v.1), RFC 1441 (v.2) RFC 2570 (v.3) Stream Control Transmission Protocol: RFC 2960, RFC 4960, RFC 3286 Tag URI scheme: RFC 4151 TELNET: RFC 15, RFC 854, RFC 855 Transmission ...
The extensions in International email apply only to email. RFC 5322 replaced RFC 2822 in 2008. Earlier, in 2001, RFC 2822 had in turn replaced RFC 822, which had been the standard for Internet email for decades. Published in 1982, RFC 822 was based on the earlier RFC 733 for the ARPANET. [34]
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In November 1981, Postel published RFC 788 describing the Simple Mail Transfer Protocol (SMTP) protocol, which was updated by RFC 821 in August 1982. Addresses were extended to username @ host. domain by RFC 805 in February 1982. RFC 822, written by Dave Crocker, defined the format for messages.
RFC 5322 – Internet Message Format (obsoletes RFC 822 aka STD 11, and RFC 2822) RFC 5504 – Downgrading Mechanism for Email Address Internationalization; RFC 6409 – Message Submission for Mail (STD 72) (obsoletes RFC 4409, RFC 2476)
Crocker was the author of RFC 822, which was published in 1982 to define the format of Internet mail messages, [5] and he was the first listed author of the earlier RFC 733 on which it was based in 1977. [6]
Every domain that supports the SMTP protocol for electronic mail is required by RFC 5321 and, as early as 1982, by RFC 822, to have the postmaster address. The rfc-ignorant.org website used to maintain a list of domains that do not comply with the RFC based on this requirement, but was shut down in November 2012.