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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. 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

  4. Email - Wikipedia

    en.wikipedia.org/wiki/Email

    RFC 5322 specifies the syntax of the email header. Each email message has a header (the "header section" of the message, according to the specification), comprising a number of fields ("header fields"). Each field has a name ("field name" or "header field name"), followed by the separator character ":", and a value ("field body" or "header ...

  5. MIME - Wikipedia

    en.wikipedia.org/wiki/MIME

    It is specified in a series of requests for comments: RFC 2045, RFC 2046, RFC 2047, RFC 4288, RFC 4289 and RFC 2049. The integration with SMTP email is specified in RFC 1521 and RFC 1522 . Although the MIME formalism was designed mainly for SMTP, its content types are also important in other communication protocols .

  6. Sender Rewriting Scheme - Wikipedia

    en.wikipedia.org/wiki/Sender_Rewriting_Scheme

    RFC 5321, as well as RFC 2821, states that non-delivery reports must be sent to the originator as indicated in the reverse path after an MTA accepted the responsibility for delivery. However, the bounce message may be suppressed when the original content is hostile (cf. spam or virus mail) or the message is forged (RFC 5321, Section 6).

  7. 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.

  8. List of RFCs - Wikipedia

    en.wikipedia.org/wiki/List_of_RFCs

    This is a partial list of RFCs (request for comments memoranda). A Request for Comments (RFC) is a publication in a series from the principal technical development and standards-setting bodies for the Internet, most prominently the Internet Engineering Task Force (IETF).

  9. Bounce address - Wikipedia

    en.wikipedia.org/wiki/Bounce_address

    bounce address - When an email can not be delivered, the MTA will create a bounce message and send it to the address given by the MAIL FROM command. Used in RFC 4406. return path - When the email is put in the recipient's email box, a new mail header is created with the name "Return-Path:" containing the address on the MAIL FROM command.