IMAP

The UIDBATCHES extension of the Internet Message Access Protocol (IMAP) allows clients to retrieve Unique Identifier (UID) ranges that partition a mailbox's messages into equally sized batches. This enables clients to perform operations such as FETCH, SEARCH, and STORE on specific message batches, providing better control over resource usage and response sizes. The extension is particularly useful with the UIDONLY mode where sequence numbers are unavailable.

This document defines a number of keywords and mailbox name

attributes that have been in use across different server and client

implementations. It defines the intended use of these keywords and

mailbox name attributes. This document registers all of these with

IANA to avoid name collisions.

This specification extends the Internet Message Access Protocol, specifically IMAP4rev1 (RFC 3501), to support UTF-8 encoded international characters in user names, mail addresses, and message headers. This specification replaces RFC 6855. This specification does not extend IMAP4rev2 (RFC 9051), since that protocol includes everything in this extension.

The MESSAGELIMIT extension of the Internet Message Access Protocol (RFCs 3501 and 9051) allows servers to announce a limit on the number of messages that can be processed in a single FETCH, SEARCH, STORE, COPY, or MOVE command (or their UID variants), or in a single APPEND or UID EXPUNGE command. This helps servers to control resource usage when performing various IMAP operations. This helps clients to know the message limit enforced by the corresponding IMAP server and avoid issuing commands that would exceed such limit.

This document defines an IMAP extension to let clients know that the messages in this IMAP server are also available via the JSON Meta Application Protocol (JMAP), and how. It is intended for clients that want to migrate gradually to JMAP or use JMAP extensions within an IMAP client.

This document describes the "processcalendar" extension to the Sieve email filtering language. The "processcalendar" extension gives Sieve the ability to process machine-readable calendar data that is encapsulated in an email message using Multipurpose Internet Mail Extensions (MIME).

This document defines a new IMAP untagged response code, "INPROGRESS", that provides progress notifications regarding the status of long-running commands.

This document defines an extension to the Internet Message Access Protocol (IMAP) LIST command that allows the client to request mailbox annotations (metadata), along with other information typically returned by the LIST command.

The UIDONLY extension to the Internet Message Access Protocol (RFCs 3501 and 9051) allows clients to enable a mode in which information about mailbox changes is returned using only Unique Identifiers (UIDs). Message numbers are not returned in responses and cannot be used in requests once this extension is enabled. This helps both clients and servers to reduce resource usage required to maintain a map between message numbers and UIDs.

This document defines an experimental IMAP extension.

The Sieve Email Filtering Language (RFC 5228) is a popular email filtering language used upon final mail delivery. This document creates a registry for Sieve actions to help developers and Sieve extension writers track interactions between different extensions.

The PARTIAL extension of the Internet Message Access Protocol (see RFCs 3501 and 9051) allows clients to limit the number of SEARCH results returned, as well as to perform incremental (paged) searches. This also helps servers to optimize resource usage when performing searches.

This document extends the PARTIAL SEARCH return option originally specified in RFC 5267. It also clarifies some interactions between RFC 5267 and RFCs 4731 and 9051.

This document updates RFCs 4731 and 5267.

This document defines a QUOTA extension of the Internet Message Access Protocol (IMAP) (see RFCs 3501 and 9051) that permits administrative limits on resource usage (quotas) to be manipulated through the IMAP protocol.

This document obsoletes RFC 2087 but attempts to remain backwards compatible whenever possible.

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; removing messages permanently; setting and clearing flags; parsing per RFCs 5322, 2045, and 2231; 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.

The OBJECTID capability of IMAP (RFC 8474) allows clients to identify mailboxes by a unique identifier that survives renaming.

This document extends the Sieve email filtering language (RFC 5228) to allow using that same unique identifier as a target for fileinto rules and for testing the existence of mailboxes.

This document specifies an Internet Message Access Protocol (IMAP) protocol extension that allows a client to request a server-generated abbreviated text representation of message data that is useful as a contextual preview of the entire message.

The SPECIAL-USE capability of the IMAP protocol (RFC 6154) allows clients to identify special-use mailboxes, e.g., where draft or sent messages should be put. This simplifies client configuration. In contrast, the Sieve mail filtering language (RFC 5228) currently has no such capability. This memo defines a Sieve extension that fills this gap: it adds a test for checking whether a special-use attribute is assigned for a particular mailbox or any mailbox, and it adds the ability to file messages into a mailbox identified solely by a special-use attribute.

The Sieve email filtering language provides a number of action commands, some of which can generate additional messages on behalf of the user. This document defines an extension to such commands to allow a copy of any generated message to be filed into a target mailbox.

This document updates RFCs 5230 and 5435 by adding a new tagged argument to the Vacation and Notify actions, respectively.

This document defines an IMAP extension that can be used to replace an existing message in a message store with a new message. Message replacement is a common operation for clients that automatically save drafts or notes as a user composes them.

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.

This document updates RFC 3501 (IMAP4rev1) with persistent identifiers on mailboxes and messages to allow clients to more efficiently reuse cached data when resources have changed location on the server.

RFC 6154 created an IMAP special-use LIST extension and defined an initial set of attributes. This document defines a new attribute, "\Important", and establishes a new IANA registry for IMAP folder attributes, which include the attributes defined in RFCs 5258, 3501, and 6154. This document also defines a new IMAP keyword, "$Important", and registers it in the registry defined in RFC 5788.

This specification extends the Internet Message Access Protocol (IMAP) to allow an administrative client to reuse the same IMAP connection on behalf of multiple IMAP user identities.

This document adds a new capability called "STATUS=SIZE" to the Internet Message Access Protocol (IMAP). It allows retrieving the total storage size of a mailbox with a single STATUS command rather than retrieving and summing the sizes of all individual messages in that mailbox.

This document defines an extension to the Internet Message Access Protocol (IMAP) LIST command that allows the client to request the set of rights that the logged-in user has been granted on mailboxes, along with other information typically returned by the LIST command.

This specification outlines current recommendations for the use of Transport Layer Security (TLS) to provide confidentiality of email traffic between a Mail User Agent (MUA) and a Mail Submission Server or Mail Access Server. This document updates RFCs 1939, 2595, 3501, 5068, 6186, and 6409.

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 that does not require this network round trip.

This document specifies 2 IMAP extensions: LITERAL+ and LITERAL-. LITERAL+ allows the alternate form of literals in all IMAP commands. LITERAL- is the same as LITERAL+, but it disallows the alternate form of literals unless they are 4096 bytes or less.

This document obsoletes RFC 2088.

This document defines an extension to the IMAP service whereby a server can inform the client about maximum message upload sizes, allowing the client to avoid sending APPEND commands that will fail because the messages are too large.

This document describes the Transport Layer Security (TLS) server identity verification procedure for SMTP Submission, IMAP, POP, and ManageSieve clients. It replaces Section 2.4 (Server Identity Check) of RFC 2595 and updates Section 4.1 (Processing After the STARTTLS Command) of RFC 3207, Section 11.1 (STARTTLS Security Considerations) of RFC 3501, and Section 2.2.1 (Server Identity Check) of RFC 5804.

The IMAP4 specification allows the searching of only the selected mailbox. A user often wants to search multiple mailboxes, and a client that wishes to support this must issue a series of SELECT and SEARCH commands, waiting for each to complete before moving on to the next. This extension allows a client to search multiple mailboxes with one command, limiting the delays caused by many round trips and not requiring disruption of the currently selected mailbox. This extension also uses MAILBOX, UIDVALIDITY, and TAG fields in ESEARCH responses, allowing a client to pipeline the searches if it chooses. This document updates RFC 4466 and obsoletes RFC 6237.

Often, multiple IMAP (RFC 3501) clients need to coordinate changes to a common IMAP mailbox. Examples include different clients working on behalf of the same user and multiple users accessing shared mailboxes. These clients need a mechanism to efficiently synchronize state changes for messages within the mailbox.

Initially defined in RFC 4551, the Conditional Store facility provides a protected update mechanism for message state information and a mechanism for requesting only changes to the message state. This memo updates that mechanism and obsoletes RFC 4551, based on operational experience.

This document additionally updates another IMAP extension, Quick Resynchronization, which builds on the Conditional STORE extension to provide an IMAP client the ability to fully resynchronize a mailbox as part of the SELECT/EXAMINE command, without the need for additional server-side state or client round trips. Hence, this memo obsoletes RFC 5162.

Finally, this document also updates the line-length recommendation in Section 3.2.1.5 of RFC 2683.

The IETF makes heavy use of email lists to conduct its work. This often involves accessing the archived history of those email lists. Participants would like to have the ability to browse and search those archives using standard IMAP clients. This memo captures the requirements for providing a service that would allow such browsing and searching, and it is intended as input to a later activity for the design and development of such a service.

This document specifies a method for IMAP and POP servers to serve internationalized messages to conventional clients. The specification is simple, easy to implement, and provides only rudimentary results.

This document defines an IMAP extension consisting of two new commands, MOVE and UID MOVE, that are used to move messages from one mailbox to another. [STANDARDS-TRACK]

Sieve defines an email filtering language that can, in principle, plug into any point in the processing of an email message. As defined in the base specification, it plugs into mail delivery. This document defines how Sieve can plug into points in IMAP where messages are created or changed, adding the option of user-defined or installation-defined filtering (or, with Sieve extensions, features such as notifications). Because this requires future Sieve extensions to specify their interactions with this one, this document updates the base Sieve specification, RFC 5228. [STANDARDS-TRACK]

This specification describes how SRV records can be used to locate email services. [STANDARDS-TRACK]

This document describes an IMAP protocol extension enabling a server to perform searches with inexact matching and assigning relevancy scores for matched messages. [STANDARDS-TRACK]

Some IMAP message stores include special-use mailboxes, such as those used to hold draft messages or sent messages. Many mail clients allow users to specify where draft or sent messages should be put, but configuring them requires that the user know which mailboxes the server has set aside for these purposes. This extension adds new optional mailbox attributes that a server may include in IMAP LIST command responses to identify special-use mailboxes to the client, easing configuration. [STANDARDS-TRACK]

This document describes an IMAP protocol extension enabling server- side message sorting on the commonly displayed portion of the From and To header fields. [STANDARDS-TRACK]

The aim of this document is to establish a new IANA registry for IMAP keywords and to define a procedure for keyword registration, in order to improve interoperability between different IMAP clients. [STANDARDS TRACK]

Many IMAP clients display information about total number of messages / total number of unseen messages in IMAP mailboxes. In order to do that, they are forced to issue a LIST or LSUB command and to list all available mailboxes, followed by a STATUS command for each mailbox found. This document provides an extension to LIST command that allows the client to request STATUS information for mailboxes together with other information typically returned by the LIST command. [STANDARDS-TRACK]

This document describes a method for streaming multimedia attachments received by a resource- and/or network-constrained device from an IMAP server. It allows such clients, which often have limits in storage space and bandwidth, to play video and audio email content.

The document describes a profile for making use of the URLAUTH- authorized IMAP URLs (RFC 5092), the Network Announcement SIP Media Service (RFC 4240), and the Media Server Control Markup Language (RFC 5022). This memo provides information for the Internet community.

This document describes a profile (a set of required extensions, restrictions, and usage modes), dubbed Lemonade, of the IMAP, mail submission, and Sieve protocols. This profile allows clients (especially those that are constrained in memory, bandwidth, processing power, or other areas) to efficiently use IMAP and Submission to access and submit mail. This includes the ability to forward received mail without needing to download and upload the mail, to optimize submission, and to efficiently resynchronize in case of loss of connectivity with the server.

The Lemonade Profile relies upon several extensions to IMAP, Sieve, and Mail Submission protocols. The document also defines a new IMAP extension and registers several new IMAP keywords. [STANDARDS-TRACK]

Notification and filtering mechanisms can make email more enjoyable on mobile and other constrained devices (such as those with limited screen sizes, memory, data transfer rates, etc.). Notifications make the client aware of significant events (such as the arrival of new mail) so it can react (such as by fetching interesting mail immediately). Filtering reduces the visible mail to a set of messages that meet some criteria for "interesting". This functionality is included in the goals of the Lemonade (Enhancements to Internet email to Support Diverse Service Environments) Working Group.

This document also discusses the use of server-to-server notifications, and how server to server notifications fit into an architecture that provides server to client notifications. This memo provides information for the Internet community.

The existing IMAP URL specification (RFC 5092) lists several <access> identifiers and <access> identifier prefixes that can be used to restrict access to URLAUTH-generated URLs. However, these identifiers do not provide facilities for new services such as streaming. This document proposes a set of new <access> identifiers as well as an IANA mechanism to register new <access> identifiers for future applications.

This document updates RFC 5092. [STANDARDS-TRACK]

The URLFETCH command defined as part of URLAUTH provides a mechanism for third parties to gain access to data held within messages in a user's private store; however, this data is sent verbatim, which is not suitable for a number of applications. This memo specifies a method for obtaining data in forms suitable for non-mail applications. [STANDARDS-TRACK]

IMAP responses consist of a response type (OK, NO, BAD), an optional machine-readable response code, and a human-readable text.

This document collects and documents a variety of machine-readable response codes, for better interoperation and error reporting. [STANDARDS-TRACK]

One of the missing features in the existing Internet mail and messaging standards is a facility for server-to-server and server-to- client event notifications related to message store events. As the scope of Internet mail expands to support more diverse media (such as voice mail) and devices (such as cell phones) and to provide rich interactions with other services (such as web portals and legal compliance systems), the need for an interoperable notification system increases. This document attempts to enumerate the types of events that interest real-world consumers of such a system.

This document describes events and event parameters that are useful for several cases, including notification to administrative systems and end users. This is not intended as a replacement for a message access facility such as IMAP. [STANDARDS-TRACK]

This document specifies the architecture for mobile email, as described by the Open Mobile Alliance (OMA), using Internet Mail protocols. This architecture was an important consideration for much of the work of the LEMONADE (Enhancements to Internet email to Support Diverse Service Environments) working group in the IETF. This document also describes how the LEMONADE architecture meets OMA's requirements for their Mobile Email (MEM) service. This memo provides information for the Internet community.

This document defines an IMAP extension that allows a client to request specific kinds of unsolicited notifications for specified mailboxes, such as messages being added to or deleted from such mailboxes. [STANDARDS-TRACK]

The document defines a way to persistently store named IMAP (RFC 3501) searches on the server. Such named searches can be subsequently referenced in a SEARCH or any other command that accepts a search criterion as a parameter. [STANDARDS-TRACK]

The METADATA extension to the Internet Message Access Protocol permits clients and servers to maintain "annotations" or "metadata" on IMAP servers. It is possible to have annotations on a per-mailbox basis or on the server as a whole. For example, this would allow comments about the purpose of a particular mailbox to be "attached" to that mailbox, or a "message of the day" containing server status information to be made available to anyone logging in to the server. [STANDARDS-TRACK]

This document discusses deployment issues and describes requirements for successful deployment of mobile email that are implicit in the IETF lemonade documents. This document specifies an Internet Best Current Practices for the Internet Community, and requests discussion and suggestions for improvements.

The IMAP4rev1 protocol has powerful search facilities as part of the core protocol, but lacks the ability to create live, updated results that can be easily handled. This memo provides such an extension, and shows how it can be used to provide a facility similar to virtual mailboxes. [STANDARDS-TRACK]

CONVERT defines extensions to IMAP allowing clients to request adaptation and/or transcoding of attachments. Clients can specify the conversion details or allow servers to decide based on knowledge of client capabilities, on user or administrator preferences, or on server settings. [STANDARDS-TRACK]

The ANNOTATE extension to the Internet Message Access Protocol permits clients and servers to maintain "meta data" for messages, or individual message parts, stored in a mailbox on the server. For example, this can be used to attach comments and other useful information to a message. It is also possible to attach annotations to specific parts of a message, so that, for example, they could be marked as seen, or important, or a comment added.

Note that this document was the product of a WG that had good consensus on how to approach the problem. Nevertheless, the WG felt it did not have enough information on implementation and deployment hurdles to meet all of the requirements of a Proposed Standard. The IETF solicits implementations and implementation reports in order to make further progress.

Implementers should be aware that this specification may change in an incompatible manner when going to Proposed Standard status. However, any incompatible changes will result in a new capability name being used to prevent problems with any deployments of the experimental extension. This memo defines an Experimental Protocol for the Internet community.

Internet Message Access Protocol (IMAP) version 4rev1 has basic support for non-ASCII characters in mailbox names and search substrings. It also supports non-ASCII message headers and content encoded as specified by Multipurpose Internet Mail Extensions (MIME). This specification defines a collection of IMAP extensions that improve international support including language negotiation for international error text, translations for namespace prefixes, and comparator negotiation for search, sort, and thread. [STANDARDS-TRACK]

This document describes the base-level server-based sorting and threading extensions to the IMAP protocol. These extensions provide substantial performance improvements for IMAP clients that offer sorted and threaded views. [STANDARDS-TRACK]

IMAP4 has two commands for listing mailboxes: LIST and LSUB. As we have added extensions, such as Mailbox Referrals, that have required specialized lists we have had to expand the number of list commands, since each extension must add its function to both LIST and LSUB, and these commands are not, as they are defined, extensible. If we've needed the extensions to work together, we've had to add a set of commands to mix the different options, the set increasing in size with each new extension. This document describes an extension to the base LIST command that will allow these additions to be done with mutually compatible options to the LIST command, avoiding the exponential increase in specialized list commands. [STANDARDS-TRACK]

Many IMAP clients use the result of a SEARCH command as the input to perform another operation, for example, fetching the found messages, deleting them, or copying them to another mailbox.

This can be achieved using standard IMAP operations described in RFC 3501; however, this would be suboptimal. The server will send the list of found messages to the client; after that, the client will have to parse the list, reformat it, and send it back to the server. The client can't pipeline the SEARCH command with the subsequent command, and, as a result, the server might not be able to perform some optimizations.

This document proposes an IMAP extension that allows a client to tell a server to use the result of a SEARCH (or Unique Identifier (UID) SEARCH) command as an input to any subsequent command. [STANDARDS-TRACK]

Most IMAP extensions are used by the client when it wants to and the server supports it. However, a few extensions require the server to know whether a client supports that extension. The ENABLE extension allows an IMAP client to say which extensions it supports. [STANDARDS-TRACK]

Recent discussions have shown that it is desirable to set different IMAP (RFC 3501) flags on message delivery. This can be done, for example, by a Sieve interpreter that works as a part of a Mail Delivery Agent.

This document describes an extension to the Sieve mail filtering language for setting IMAP flags. The extension allows setting of both IMAP system flags and IMAP keywords. [STANDARDS-TRACK]

IMAP (RFC 3501) is a rich protocol for accessing remote message stores. It provides an ideal mechanism for accessing public mailing list archives as well as private and shared message stores. This document defines a URL scheme for referencing objects on an IMAP server.

This document obsoletes RFC 2192. It also updates RFC 4467. [STANDARDS-TRACK]

To date, the Internet Message Access Protocol (IMAP) has used a Simple Authentication and Security Layer (SASL) profile which always required at least one complete round trip for an authentication, as it did not support an initial client response argument. This additional round trip at the beginning of the session is undesirable, especially when round-trip costs are high.

This document defines an extension to IMAP which allows clients and servers to avoid this round trip by allowing an initial client response argument to the IMAP AUTHENTICATE command. [STANDARDS-TRACK]

This document describes the WITHIN extension to IMAP SEARCH. IMAP SEARCH returns messages whose internal date is within or outside a specified interval. The mechanism described here, OLDER and YOUNGER, differs from BEFORE and SINCE in that the client specifies an interval, rather than a date. WITHIN is useful for persistent searches where either the device does not have the capacity to perform the search at regular intervals or the network is of limited bandwidth and thus there is a desire to reduce network traffic from sending repeated requests and redundant responses. [STANDARDS-TRACK]

The COMPRESS extension allows an IMAP connection to be effectively and efficiently compressed. [STANDARDS-TRACK]

This document extends IMAP (RFC 3501) SEARCH and UID SEARCH commands with several result options, which can control what kind of information is returned. The following result options are defined: minimal value, maximal value, all found messages, and number of found messages. [STANDARDS-TRACK]

This document attempts to address some of the issues involved in building a disconnected IMAP4 client. In particular, it deals with the issues of what might be called the "driver" portion of the synchronization tool: the portion of the code responsible for issuing the correct set of IMAP4 commands to synchronize the disconnected client in the way that is most likely to make the human who uses the disconnected client happy.

This note describes different strategies that can be used by disconnected clients and shows how to use IMAP protocol in order to minimize the time of the synchronization process.

This note also lists IMAP extensions that a server should implement in order to provide better synchronization facilities to disconnected clients. This memo provides information for the Internet community.

This document describes the URLAUTH extension to the Internet Message Access Protocol (IMAP) (RFC 3501) and the IMAP URL Scheme (IMAPURL) (RFC 2192). This extension provides a means by which an IMAP client can use URLs carrying authorization to access limited message data on the IMAP server.

An IMAP server that supports this extension indicates this with a capability name of "URLAUTH". [STANDARDS-TRACK]

The submission profile of Simple Mail Transfer Protocol (SMTP) provides a standard way for an email client to submit a complete message for delivery. This specification extends the submission profile by adding a new BURL command that can be used to fetch submission data from an Internet Message Access Protocol (IMAP) server. This permits a mail client to inject content from an IMAP server into the SMTP infrastructure without downloading it to the client and uploading it back to the server. [STANDARDS-TRACK]

The CATENATE extension to the Internet Message Access Protocol (IMAP) 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. Using this extension, the client can catenate parts of an already existing message onto a new message without having to first download the data and then upload it back to the server. [STANDARDS-TRACK]

Over the years, many documents from IMAPEXT and LEMONADE working groups, as well as many individual documents, have added syntactic extensions to many base IMAP commands described in RFC 3501. For ease of reference, this document collects most of such ABNF changes in one place.

This document also suggests a set of standard patterns for adding options and extensions to several existing IMAP commands defined in RFC 3501. The patterns provide for compatibility between existing and future extensions.

This document updates ABNF in RFCs 2088, 2342, 3501, 3502, and 3516. It also includes part of the errata to RFC 3501. This document doesn't specify any semantic changes to the listed RFCs. [STANDARDS-TRACK]

This document is a history capturing the background, motivation and thinking during the LEMONADE definition and design process.

The LEMONADE Working Group -- Internet email to support diverse service environments -- is chartered to provide enhancements to Internet mail to facilitate its use by more diverse clients. In particular, by clients on hosts not only operating in environments with high latency/bandwidth-limited unreliable links but also constrained to limited resources. The enhanced mail must be backwards compatible with existing Internet mail.

The primary motivation for this effort is -- by making Internet mail protocols richer and more adaptable to varied media and environments -- to allow mobile handheld devices tetherless access to Internet mail using only IETF mail protocols.

The requirements for these devices drive a discussion of the possible protocol enhancements needed to support multimedia messaging on limited-capability hosts in diverse service environments. A list of general principles to guide the design of the enhanced messaging protocols is documented. Finally, additional issues of providing seamless service between enhanced Internet mail and the existing separate mobile messaging infrastructure are briefly listed. This memo provides information for the Internet community.

The cellular telephone industry has defined a service known as the Multimedia Messaging Service (MMS). This service uses formats and protocols that are similar to, but differ in key ways from, those used in Internet mail.

One important difference between MMS and Internet Mail is that MMS uses headers that start with "X-Mms-" to carry a variety of user agent- and server-related information elements.

This document specifies how to exchange messages between these two services, including mapping information elements as used in MMS X-Mms-* headers as well as delivery and disposition reports, to and from that used in SMTP and Internet message headers. [STANDARDS-TRACK]

The UIDPLUS extension of the Internet Message Access Protocol (IMAP) provides a set of features intended to reduce the amount of time and resources used by some client operations. The features in UIDPLUS are primarily intended for disconnected-use clients. [STANDARDS-TRACK]

The Access Control List (ACL) extension (RFC 2086) of the Internet Message Access Protocol (IMAP) permits mailbox access control lists to be retrieved and manipulated through the IMAP protocol.

This document is a revision of RFC 2086. It defines several new access control rights and clarifies which rights are required for different IMAP commands. [STANDARDS-TRACK]

This document defines a mechanism for the backhauling of V5.2 messages over IP using the Stream Control Transmission Protocol (SCTP). This protocol may be used between a Signaling Gateway (SG) and a Media Gateway controller (MGC). It is assumed that the SG receives V5.2 signaling over a standard V5.2 interface. This document builds on the ISDN User Adaptation Layer Protocol (RFC 3057). It defines all necessary extensions to the IUA Protocol needed for the V5UA protocol implementation. [STANDARDS-TRACK]

This document defines an UNSELECT command that can be used to close the current mailbox in an Internet Message Access Protocol - version 4 (IMAP4) session without expunging it. Certain types of IMAP clients need to release resources associated with the selected mailbox without selecting a different mailbox. While IMAP4 provides this functionality (via a SELECT command with a nonexistent mailbox name or reselecting the same mailbox with EXAMINE command), a more clean solution is desirable. [STANDARDS-TRACK]

As the demand for high-performance mail delivery agents increases, it becomes apparent that single-machine solutions are inadequate to the task, both because of capacity limits and that the failure of the single machine means a loss of mail delivery for all users. It is preferable to allow many machines to share the responsibility of mail delivery. The Mailbox Update (MUPDATE) protocol allows a group of Internet Message Access Protocol (IMAP) or Post Office Protocol - Version 3 (POP3) servers to function with a unified mailbox namespace. This document is intended to serve as a reference guide to that protocol.

This memo defines the Binary extension to the Internet Message Access Protocol (IMAP4). It provides a mechanism for IMAP4 clients and servers to exchange message body data without using a MIME content-transfer- encoding. [STANDARDS-TRACK]

This document describes the multiappending extension to the Internet Message Access Protocol (IMAP) (RFC 3501). This extension provides substantial performance improvements for IMAP clients which upload multiple messages at a time to a mailbox on the server. A server which supports this extension indicates this with a capability name of "MULTIAPPEND". [STANDARDS-TRACK]

The Message Disposition Notification (MDN) facility defined in RFC 2298 provides a means by which a message can request that message processing by the recipient be acknowledged as well as a format to be used for such acknowledgements. However, it doesn't describe how multiple Mail User Agents (MUAs) should handle the generation of MDNs in an Internet Message Access Protocol (IMAP4) environment. This document describes how to handle MDNs in such an environment and provides guidelines for implementers of IMAP4 that want to add MDN support to their products. [STANDARDS-TRACK]

The CHILDREN extension provides a mechanism for a client to

efficiently determine if a particular mailbox has children, without

issuing a LIST '' * or a LIST '' % for each mailbox name.

This document describes an ID extension which will enable Internet Message Access Protocol - Version 4rev1 (IMAP4rev1) to advertise what program a client or server uses to provide service. The ID extension allows the server and client to exchange identification information on their implementation in order to make bug reports and usage statistics more complete. [STANDARDS-TRACK]

The IMAP4 specification describes a rich protocol for use in building clients and servers for storage, retrieval, and manipulation of electronic mail. Because the protocol is so rich and has so many implementation choices, there are often trade-offs that must be made and issues that must be considered when designing such clients and servers. This document attempts to outline these issues and to make recommendations in order to make the end products as interoperable as possible. This memo provides information for the Internet community.

Recognizing that such sites will desire simple password authentication in combination with TLS encryption, this specification defines the PLAIN SASL mechanism for use with protocols which lack a simple password authentication command such as ACAP and SMTP. [STANDARDS-TRACK]

This document defines a NAMESPACE command that allows a client to discover the prefixes of namespaces used by a server for personal mailboxes, other users' mailboxes, and shared mailboxes. [STANDARDS-TRACK]

When dealing with large amounts of users and many IMAP4 [RFC-2060] servers, it is often necessary to move users from one IMAP4 server to another. Login referrals allow clients to transparently connect to an alternate IMAP4 server, if their home IMAP4 server has changed. [STANDARDS-TRACK]

Mailbox referrals allow clients to seamlessly access mailboxes that are distributed across several IMAP4 servers. [STANDARDS-TRACK]

This specification provides a simple challenge-response authentication protocol that is suitable for use with IMAP4. [STANDARDS-TRACK]

The behavior described in this document reflects the practice of some existing servers or behavior that the consensus of the IMAP mailing list has deemed to be reasonable. The behavior described within this document is believed to be [RFC-2060] compliant. However, this document is not meant to define IMAP4 compliance, nor is it an exhaustive list of valid IMAP4 behavior. This memo provides information for the Internet community. This memo does not specify an Internet standard of any kind.

This document specifies the syntax of an IDLE command, which will allow a client to tell the server that it's ready to accept such real-time updates. [STANDARDS-TRACK]

This document is intended to be read along with RFC 1176 and the most recent IMAP4 specification (RFC 2060) to assist implementors in creating an IMAP4 implementation to interoperate with implementations that conform to earlier specifications. This memo provides information for the Internet community. This memo does not specify an Internet standard of any kind.

This document describes obsolete syntax which may be encountered by IMAP4 implementations which deal with older versions of the Internet Mail Access Protocol. This memo provides information for the Internet community. This memo does not specify an Internet standard of any kind.

The Internet Message Access Protocol, Version 4 [IMAP4] contains the AUTHENTICATE command, for identifying and authenticating a user to an IMAP4 server and for optionally negotiating a protection mechanism for subsequent protocol interactions. This document describes several authentication mechanisms for use by the IMAP4 AUTHENTICATE command. [STANDARDS-TRACK]

This is a summary of hints and recommendations to enable an IMAP4 implementation to interoperate with implementations that conform to earlier specifications. This memo provides information for the Internet community. This memo does not specify an Internet standard of any kind.

There are three fundamental models of client/server email: offline, online, and disconnected use. IMAP4 can be used in any one of these three models. This memo provides information for the Internet community. This memo does not specify an Internet standard of any kind.

This RFC suggests a method for workstations to access mail dynamically from a mailbox server ("repository"). The following document is a modified version of RFC 1064, the definition of the IMAP2 protocol. This RFC specifies an Experimental Protocol for the Internet community. It does not specify any standard.

This RFC suggests a method for personal computers and workstations to dynamically access mail from a mailbox server ("repository"). It obosoletes RFC 1064. This RFC specifies an Experimental Protocol for the Internet community. Discussion and suggestions for improvement are requested. Please refer to the current edition of the "IAB Official Protocol Standards" for the standardization state and status of this protocol.