The only difference between the three fields is how each is used. Some of them will not appear anywhere else in the syntax, but they are convenient to refer to in other parts of this document. Messages with trace fields There are several algorithms that can be used to accomplish this. Folding white space and comments White space characters, including white space used in folding described in section 2. Section 4 of this document specifies an "obsolete" syntax. Differences from earlier standards The contents comprise the object to be delivered to the recipient. However, some message systems may use information from the contents to create the envelope. No other fields in the message are changed when resent fields are added. Obsolete header fields Syntactically, the primary difference in the obsolete field syntax is that it allows multiple occurrences of any of the fields and they may occur in any order. Each of the characters in specials can be used to indicate a tokenization point in lexical analysis.
This creates the possibility of having two consecutive "folds" in a line, and therefore the possibility that a line which makes up a folded header field could be composed entirely of white space. For instance, if a field body is defined as comma-separated values, it is recommended that folding occur after the comma separating the structured items in preference to other places where the field could be folded, even if it is allowed elsewhere. Appendix C has copyright and intellectual property notices. A message from one person to another with simple addressing Using a date on the left hand side and a domain name or domain literal on the right hand side makes it possible to guarantee uniqueness since no two hosts use the same domain name or IP address at the same time. They are simply single characters. The second letter is either "S" for "Standard" time, or "D" for "Daylight" or summer time. Structured Header Field Bodies Therefore, the white space and comments may be allowed in the higher-level tokens even though they may not explicitly appear in a particular definition. However, since items in this syntax have been determined to be non-interoperable or to cause significant problems for recipients of messages, they MUST NOT be generated by creators of conformant messages. The year is any numeric year or later. Some of them will not appear anywhere else in the syntax, but they are convenient to refer to in other parts of this document. One important difference between the obsolete interpreting and the current generating syntax is that in structured header field bodies i. Semantically, the optional comments and FWS surrounding the rest of the characters are not part of the atom; the atom is only the run of atext characters in an atom, or the atext and ". There are several algorithms that can be used to accomplish this. If a reply is sent to a message that has destination fields, it is often desirable to send a copy of the reply to all of the recipients of the message, in addition to the author. Readers of this standard need to pay special attention to how these lexical tokens are used in both the lower-level and higher-level syntax later in the document. As with the regular originator fields, there are two forms: That is, the day-of-the-week if included MUST be the day implied by the date, the numeric day-of-month MUST be between 1 and the number of days allowed for the specified month in the specified year , the time-of-day MUST be in the range The character limit is due to limitations in many implementations which send, receive, or store Internet Message Format messages that simply cannot handle more than characters on a line. The generator of the message identifier MUST guarantee that the msg-id is unique. Obsolete destination address fields The route is simply a comma-separated list of domain names, each preceded by " ", and the list terminated by a colon. This section, section 1 , is a short introduction to the document. If the string can be represented as a dot-atom that is, it contains no characters other than atext characters or ".
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