Experimental RFC 5257, by Cyrus Daboo of Apple, and Randall Gellens of Qualcomm, defines the ANNOTATE extension to IMAP, a protocol widely used for handling email messages. The extension permits clients and servers to maintain permanent meta data—such as comments—for messages (or individual message parts) stored in a mailbox on a server.
The ANNOTATE extension, when present, modifies FETCH, STORE, SEARCH, SORT, APPEND, COPY, SELECT and EXAMINE. It also adds the IMAP capability ANNOTATE-EXPERIMENT-1, the response codes ANNOTATIONS, ANNOTATE TOOBIG and ANNOTATE TOOMANY, as well as the ACL right n for use with ACL extensions.
The entire document is available at RFC archives, e.g. www.rfc-editor.org. The IETF solicits implementations and implementation reports in order to make further progress on the ANNOTATE extension.
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