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  2. Unicode and email - Wikipedia

    en.wikipedia.org/wiki/Unicode_and_Email

    To use Unicode in the domain part of email addresses, IDNA encoding must traditionally be used. Alternatively, SMTPUTF8 [3] allows the use of UTF-8 encoding in email addresses (both in a local part and in domain name) as well as in a mail header section. Various standards had been created to retrofit the handling of non-ASCII data to the ...

  3. MIME - Wikipedia

    en.wikipedia.org/wiki/MIME

    Multipurpose Internet Mail Extensions (MIME) is a standard that extends the format of email messages to support text in character sets other than ASCII, as well as attachments of audio, video, images, and application programs. Message bodies may consist of multiple parts, and header information may be specified in non-ASCII character sets.

  4. Email address - Wikipedia

    en.wikipedia.org/wiki/Email_address

    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.

  5. Email - Wikipedia

    en.wikipedia.org/wiki/Email

    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.

  6. Simple Mail Transfer Protocol - Wikipedia

    en.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol

    SMTPUTF8 – Allow UTF-8 encoding in mailbox names and header fields, RFC 6531; UTF8SMTP – Allow UTF-8 encoding in mailbox names and header fields, RFC 5336 (deprecated [35]) The ESMTP format was restated in RFC 2821 (superseding RFC 821) and updated to the latest definition in RFC 5321 in 2008.

  7. International email - Wikipedia

    en.wikipedia.org/wiki/International_email

    Although the traditional format for email header section allows non-ASCII characters to be included in the value portion of some of the header fields using MIME-encoded words (e.g. in display names or in a Subject header field), MIME-encoding must not be used to encode other information in a header, such as an email address, or header fields like Message-ID or Received.

  8. List of HTTP header fields - Wikipedia

    en.wikipedia.org/wiki/List_of_HTTP_header_fields

    Headers: Permanent Message Header Field Names; RFC 6265: IETF HTTP State Management Mechanism; RFC 9110: HTTP Semantics; RFC 9111: HTTP Caching; RFC 9112: HTTP/1.1; RFC 9113: HTTP/2; RFC 9114: HTTP/3; RFC 7239: Forwarded HTTP Extension; RFC 7240: Prefer Header for HTTP; HTTP/1.1 headers from a web server point of view

  9. mailto - Wikipedia

    en.wikipedia.org/wiki/Mailto

    mailto is a Uniform Resource Identifier (URI) scheme for email addresses.It is used to produce hyperlinks on websites that allow users to send an email to a specific address directly from an HTML document, without having to copy it and entering it into an email client.