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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.
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:
Making changes to the From: header field to pass DKIM alignment may bring the message out of compliance with RFC 5322 section 3.6.2: "The 'From:' field specifies the author(s) of the message, that is, the mailbox(es) of the person(s) or system(s) responsible for the writing of the message." Mailbox refers to the author's email address.
Does anybody want to refute these examples as “valid email addresses” based on the syntax defined by RFC-5322 ‘addr-spec’? Fun fact: a valid RFC-5321 ‘Mailbox’ address is always a valid RFC-5322 ‘addr-spec’, because the syntax allowed by RFC-5321 is a subset of that allowed by RFC-5322.
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 )
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 ...
Email authentication, or validation, is a collection of techniques aimed at providing verifiable information about the origin of email messages by validating the domain ownership of any message transfer agents (MTA) who participated in transferring and possibly modifying a message.
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 ...