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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.
The domains in 5322-From addresses are not necessarily the same as in the more elaborated Purported Responsible Address covered by Sender ID specified in RFC 4407. The domain in a 5322-From address is also not necessarily the same as in the envelope sender address defined in RFC 5321, also known as SMTP MAIL FROM, envelope-From, 5321-From, or ...
HTML email is the use of a subset of HTML to provide formatting and semantic markup ... (defined in RFC 5322, ... that reveals that an email address is real, and can ...
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.
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 )
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>> Neither RFC defines email address or e-mail address. But RFC-5321 defines the syntax for the “string that identifies a user to whom mail will be sent or a location into which mail will be deposited.” — that is the ‘Mailbox’ grammar rule from Section 4.1.2. Gene.hightower 19:55, 4 April 2024 (UTC) >> Neither RFC defines email ...