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22Protocols GuideTCP/IP - Application Layer ProtocolsProtocol NameIMAP & IMAP4: Internet MessageAccess Protocol (version4)Protocol DescriptionInternet Message Access Protocol (IMAP) is a method of accessingelectronic mail or bulletin board messages that are kepton a mail server. IMAP permits a “client” email program to accessremote message stores as if they were local. Email storedon an IMAP server can be manipulated from a desktop computerremotely, without the need to transfer messages or filesback and forth between these computers.There are several different technologies and approaches tobuilding a distributed electronic mail infrastructure: POP (PostOffice Protocol), DMSP (Distributed Mail System Protocol) andIMAP (Internet Message Access Protocol) among them. Of thethree, POP is the oldest and consequently the best known.DMSP is largely limited to a single application, PCMAIL, and isknown primarily for its excellent support of “disconnected” operation.IMAP offers a superset of POP and DMSP capabilities,and provides good support for all three modes of remote mailboxaccess: offline, online, and disconnected.In the online mode, the IMAP mail client does not copy mails ina shared server all at once and then delete them. It is an interactiveclient-server model, where the client can ask the serverfor headers or the bodies of specified messages, or to searchfor messages meeting certain criteria. Messages in the mail repositorycan be marked with various status flags (e.g. “deleted”or “answered”) and they stay in the repository until explicitly removedby the user. IMAP is designed to permit manipulationof remote mailboxes as if they were local. Depending on theIMAP client implementation and the mail architecture desired bythe system manager, the user may save messages directly onthe client machine or save them on the server, or be given thechoice of doing either.IMAP includes operations for creating, deleting and renamingmailboxes; checking for new messages; permanently removingmessages; setting and clearing flags; server-based and MIMEparsing, and searching; and selective fetching of message attributes,texts, and portions thereof for efficiency. IMAP allows clientsto access messages (both new and saved) from more thanone computer. This feature has become extremely important asreliance on electronic messaging and use of multiple computershas increased.The current version of IMAP is version 4 revision 1(IMAP4 rev1).Key features for IMAP4 include:• Fully compatible with Internet messaging standards,e.g. MIME.• Allows message access and management from morethan one computer.• Allows access without reliance on less efficient file accessprotocols.• Provides support for “online”, “offline”, and “disconnected”access modes.• Supports concurrent access to shared mailboxes.• Client software needs no knowledge about the server’sfile store format.Protocol StructureIMAP key commands:APPENDAUTHENTICATECAPABILITYCHECKCLOSECOPYCREATEDELETEDELETEACLEXAMINEEXPUNGEFETCHGETACLGETQUOTAGETQUOTAROOTLISTLISTRIGHTSLOGINLOGOUTLSUBMYRIGHTSNOOPRENAMESEARCHSELECTSETACLSETQUOTASTARTTLSSTATUSSTORESUBSCRIBEUIDUNSELECTUNSUBSCRIBEXRelated protocolsSMTP, TCP, POP, POP3, MIME, DMSP
23Protocols GuideTCP/IP - Application Layer ProtocolsSponsor SourceIMAP is defined by IETF (http://www.ietf.org)Referencehttp://www.javvin.com/protocol/rfc3501.pdfINTERNET MESSAGE ACCESS PROTOCOL - VERSION4rev1
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Page 3 and 4: ITable of ContentsTable of Contents
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98Protocols GuideTCP/IP - Data Link
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100Protocols GuideTCP/IP - Data Lin
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102Protocols GuideSecurity and VPNP
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104Protocols GuideSecurity and VPN
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150Protocols GuideWANOtherxDSL: Dig
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152Protocols GuideWAN - ATM Protoco
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170Protocols GuideWAN - Broadband A
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210Protocols GuideLAN - Wilress LAN
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216Protocols GuideLAN - Other Proto
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222Protocols GuideMAN ProtocolsProt
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224Protocols GuideMAN Protocols(0).
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226Protocols GuideStorage Area Netw
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228Protocols GuideSAN ProtocolsProt
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230Protocols GuideSAN ProtocolsThe
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232Protocols GuideSAN Protocols•
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234Protocols GuideSAN ProtocolsSpon
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240Protocols GuideISO Protocols in
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242Protocols GuideISO Protocols - A
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268Protocols GuideCisco ProtocolsPr
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278Protocols GuideCisco Protocolsti
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280Protocols GuideNovell NetWare an
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288Protocols GuideIBM ProtocolsSNAT
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300Protocols GuideAppleTalk: Apple
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302Protocols GuideDECnet and Protoc
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304Protocols GuideSS7 / C7 Protocol
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318Protocols GuideOther Protocols
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320Protocols GuideOther ProtocolsPr
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322Protocols GuideOther ProtocolsPr
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324Network Protocols Dictionary: Fr
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342Network Communication Protocols
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