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CRLF pair. <br /> In order to simplify parsing, all POP3 servers are <br /> required to use a certain format for scan listings. A <br /> scan listing consists of the message-number of the <br /> message, followed by a single space and the exact size of <br /> the message in octets. Methods for calculating the exact <br /> size of the message are described in the "Message Format" <br /> section below. This memo makes no requirement on what <br /> follows the message size in the scan listing. Minimal <br /> implementations should just end that line of the response <br /> with a CRLF pair. More advanced implementations may <br /> include other information, as parsed from the message. <br /> NOTE: This memo STRONGLY discourages implementations <br /> from supplying additional information in the scan <br /> listing. Other, optional, facilities are discussed <br /> later on which permit the client to parse the messages <br /> in the maildrop. <br /> Note that messages marked as deleted are not listed. <br /> Possible Responses: <br /> +OK scan listing follows <br /> -ERR no such message <br /> Examples: <br /> C: LIST <br /> S: +OK 2 messages (320 octets) <br /> S: 1 120 <br />Myers & Rose Standards Track [Page 7] <br /> <br />RFC 1939 POP3 May 1996 <br /> S: 2 200 <br /> S: . <br /> ... <br /> C: LIST 2 <br /> S: +OK 2 200 <br /> ... <br /> C: LIST 3 <br /> S: -ERR no such message, only 2 messages in maildrop <br /> RETR msg <br /> Arguments: <br /> a message-number (required) which may NOT refer to a <br /> message marked as deleted <br /> Restrictions: <br /> may only be given in the TRANSACTION state <br /> Discussion: <br /> If the POP3 server issues a positive response, then the <br /> response given is multi-line. After the initial +OK, the <br /> POP3 server sends the message corresponding to the given <br /> message-number, being careful to byte-stuff the termination <br /> character (as with all multi-line responses). <br /> Possible Responses: <br /> +OK message follows <br /> -ERR no such message <br /> Examples: <br /> C: RETR 1 <br /> S: +OK 120 octets <br /> S: <the POP3 server sends the entire message here> <br /> S: . <br /> DELE msg <br /> Arguments: <br /> a message-number (required) which may NOT refer to a <br /> message marked as deleted <br /> Restrictions: <br /> may only be given in the TRANSACTION state <br />Myers & Rose Standards Track [Page 8] <br /> <br />RFC 1939 POP3 May 1996 <br /> Discussion: <br /> The POP3 server marks the message as deleted. Any future <br /> reference to the message-number associated with the message <br /> in a POP3 command generates an error. The POP3 server does <br /> not actually delete the message until the POP3 session <br /> enters the UPDATE state. <br /> Possible Responses: <br /> +OK message deleted <br /> -ERR no such message <br /> Examples: <br /> C: DELE 1 <br /> S: +OK message 1 deleted <br /> ... <br /> C: DELE 2 <br /> S: -ERR message 2 already deleted <br /> NOOP <br /> Arguments: none <br /> Restrictions: <br /> may only be given in the TRANSACTION state <br /> Discussion: <br /> The POP3 server does nothing, it merely replies with a <br /> positive response. <br /> Possible Responses: <br /> +OK <br /> Examples: <br /> C: NOOP <br /> S: +OK <br /> RSET <br />
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