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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.
A mailbox name is the first part of an email address, also known as local-part; that is, the part before the @ symbol. Its format is formally specified by RFC 5322 and RFC 5321. It is often the username of the recipient on the mail server or in the destination domain. The local-part may be up to 64 characters long and, in theory, is case-sensitive.
The basic Internet message format used for email [33] is defined by RFC 5322, with encoding of non-ASCII data and multimedia content attachments defined in RFC 2045 through RFC 2049, collectively called Multipurpose Internet Mail Extensions or MIME. The extensions in International email apply only to email. RFC 5322 replaced RFC 2822 in 2008.
>> Neither RFC defines email address or e-mail address. And this may be the root of the confusion for many people. The grammar rule that maps to a conceptual “email address” is called ‘Mailbox’ in RFC-5321, and is called ‘addr-spec’ in RFC-5322. Gene.hightower 17:16, 4 April 2024 (UTC)
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 )
(The email address in MAIL FROM is also called the bounce address, envelope-from or RFC5321.MailFrom.) In addition to requiring that the SPF check passes, DMARC checks that RFC5321.MailFrom aligns with 5322.From. [2] DKIM allows parts of an email message to be cryptographically signed, and the signature must cover the From field.
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RFC 2045 RFC 2046 RFC 2047 RFC 2049 Network address translation: RFC 1631, RFC 2663, RFC 2993, RFC 3022, RFC 3027, RFC 3234, RFC 3489, RFC 4787, RFC 5389 Network File System: RFC 1094, RFC 1813 (v.3), RFC 3010 (v.4), RFC 3530 (v.4) Network News Transfer Protocol: RFC 977, RFC 3977 Network Time Protocol