19 April 2006 09:15
RFC 4469 (Updates: 3501, 3502) : Internet Message Access Protocol (IMAP) CATENATE Extension - P. Resnick, QUALCOMM Incorporated - April 2006
"The CATENATE extension [...] extends the APPEND command to allow clients to create messages on the IMAP server that may contain a combination of new data along with parts of (or entire) messages already on the server".
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