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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 ...
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 ...
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 .
RFC 8601 defines a trace header field Authentication-Results: where a receiver can record the results of email authentication checks that it carried out. [16] Multiple results for multiple methods can be reported in the same field, separated by semicolons and wrapped as appropriate.
The set of Internet RFC documents RFC 6530, RFC 6531, RFC 6532, and RFC 6533, all of them published in February 2012, define mechanisms and protocol extensions needed to fully support internationalized email addresses. These changes include an SMTP extension and extension of email header syntax to accommodate UTF-8 data. The document set also ...
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
However, there are many similar email header fields that all contain sending party information; therefore Sender ID defines in RFC 4407 [4] a Purported Responsible Address (PRA) as well as a set of heuristic rules to establish this address from the many typical headers in an email.
ARC-Seal (abbreviated AS) - A combination of an instance number (i), a DKIM-like signature of the previous ARC-Seal headers, and the validity of the prior ARC entries. ARC-Message-Signature (abbreviated AMS) - A combination of an instance number (i) and a DKIM-like signature of the entire message except for the ARC-Seal headers