IMAP4 non-synchronizing literals

Document Type Replaced Internet-Draft (individual)
Authors John Myers  , Alexey Melnikov 
Last updated 2015-03-09
Replaced by RFC 7888, RFC 7888
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Expired & archived
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IESG IESG state Replaced by draft-ietf-imapapnd-rfc2088bis, draft-ietf-imapapnd-rfc2088bis
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


The Internet Message Access Protocol (RFC 3501) contains the "literal" syntactic construct for communicating strings. When sending a literal from client to server, IMAP requires the client to wait for the server to send a command continuation request between sending the octet count and the string data. This document specifies an alternate form of literal which does not require this network round trip. This document specifies 2 IMAP extensions: LITERAL+ and LITERAL-. The former allows the alternate form of literals in all IMAP command. The latter is the same as LITERAL+, but disallow the alternate form in IMAP APPEND, unless they are 4096 bytes or less.


John Myers (
Alexey Melnikov (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)