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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 [6]) and the associated errata.
The only text strings that define an “email address” are the ‘Local-part’ and ‘Domain’ of RFC-5321, which correspond to the ‘local-part’ and ‘domain’ of RFC-5322. These two strings joined by an ‘@’ character (code point decimal 64) are, in both documents, what people know as an “email address.”
RFC 5228 : Sieve: An Email Filtering Language: January 2008: Sieve: Obsoletes RFC 3028 RFC 5321 : Simple Mail Transfer Protocol: October 2008: SMTP, Internet Message Format: RFC 5322 : Internet Message Format: October 2008: RFC 5533 : Shim6: Level 3 Multihoming Shim Protocol for IPv6: June 2009: Site Multihoming by IPv6 Intermediation: RFC 5545 ...
The basic Internet message format used for email [34] 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.
FAO, meaning "For the Attention Of", especially in email or written correspondence. This can be used to direct an email towards an individual when an email is being sent to a team email address or to a specific department in a company. e.g. FAO: Jo Smith, Finance Department. FYI or Fyi: , "for your information". The recipient is informed that ...
During periods of increased network threats, the US Department of Defense has converted user's incoming HTML email to text email. [20] The multipart type is intended to show the same content in different ways, but this is sometimes abused; some email spam takes advantage of the format to trick spam filters into believing that the message is ...
A "Basic Status Code" SMTP reply consists of a three digit number (transmitted as three numeric characters) followed by some text. The number is for use by automata (e.g., email clients) to determine what state to enter next; the text ("Text Part") is for the human user. The first digit denotes whether the response is good, bad, or incomplete:
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 ...