Internet Message Access Protocol (IMAP) - SAVEDATE Extension, January 2019
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This document adds a new capability called "SAVEDATE" to the Internet Message Access Protocol (IMAP). It defines a new IMAP message attribute called "save date" that, unlike the existing "internal date" attribute, always indicates the moment at which the message was saved in its current mailbox. The SAVEDATE capability extends the FETCH command with the means to retrieve the save date attribute and extends the SEARCH command to allow using the save date attribute in searching criteria.
For the definition of Status, see RFC 2026.
For the definition of Stream, see RFC 8729.