Internet Message Access Protocol (IMAP) - Version 4rev2
draft-ietf-extra-imap4rev2-20

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Network Working Group                                   A. Melnikov, Ed.
Internet-Draft                                                 Isode Ltd
Obsoletes: 3501 (if approved)                              B. Leiba, Ed.
Intended status: Standards Track                  Futurewei Technologies
Expires: April 30, 2021                                 October 27, 2020

        Internet Message Access Protocol (IMAP) - Version 4rev2
                     draft-ietf-extra-imap4rev2-20

Abstract

   The Internet Message Access Protocol, Version 4rev2 (IMAP4rev2)
   allows a client to access and manipulate electronic mail messages on
   a server.  IMAP4rev2 permits manipulation of mailboxes (remote
   message folders) in a way that is functionally equivalent to local
   folders.  IMAP4rev2 also provides the capability for an offline
   client to resynchronize with the server.

   IMAP4rev2 includes operations for creating, deleting, and renaming
   mailboxes, checking for new messages, permanently removing messages,
   setting and clearing flags, RFC 5322, RFC 2045 and RFC 2231 parsing,
   searching, and selective fetching of message attributes, texts, and
   portions thereof.  Messages in IMAP4rev2 are accessed by the use of
   numbers.  These numbers are either message sequence numbers or unique
   identifiers.

   IMAP4rev2 does not specify a means of posting mail; this function is
   handled by a mail submission protocol such as the one specified in
   RFC 6409.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on April 30, 2021.

Melnikov & Leiba         Expires April 30, 2021                 [Page 1]
Internet-Draft                  IMAP4rev2                   October 2020

Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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   it for publication as an RFC or to translate it into languages other
   than English.

Table of Contents

   1.  How to Read This Document . . . . . . . . . . . . . . . . . .   5
     1.1.  Organization of This Document . . . . . . . . . . . . . .   5
     1.2.  Conventions Used in This Document . . . . . . . . . . . .   5
     1.3.  Special Notes to Implementors . . . . . . . . . . . . . .   6
   2.  Protocol Overview . . . . . . . . . . . . . . . . . . . . . .   7
     2.1.  Link Level  . . . . . . . . . . . . . . . . . . . . . . .   7
     2.2.  Commands and Responses  . . . . . . . . . . . . . . . . .   7
       2.2.1.  Client Protocol Sender and Server Protocol Receiver .   7
       2.2.2.  Server Protocol Sender and Client Protocol Receiver .   8
     2.3.  Message Attributes  . . . . . . . . . . . . . . . . . . .   9
       2.3.1.  Message Numbers . . . . . . . . . . . . . . . . . . .   9
       2.3.2.  Flags Message Attribute . . . . . . . . . . . . . . .  11
       2.3.3.  Internal Date Message Attribute . . . . . . . . . . .  13
       2.3.4.  [RFC-5322] Size Message Attribute . . . . . . . . . .  14
       2.3.5.  Envelope Structure Message Attribute  . . . . . . . .  14
       2.3.6.  Body Structure Message Attribute  . . . . . . . . . .  14
     2.4.  Message Texts . . . . . . . . . . . . . . . . . . . . . .  14