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NetworkWorkingGroupP.Resnick,EditorRequestforComments:2822QUALCOMMIncorporatedObsoletes:822April2001Category:StandardsTrackInternetMessageFormatStatusofthisMemoThisdocumentspecifiesanInternetstandardstrackprotocolfortheInternetcommunity,andrequestsdiscussionandsuggestionsforimprovements.PleaserefertothecurrenteditionoftheInternetOfficialProtocolStandards(STD1)forthestandardizationstateandstatusofthisprotocol.Distributionofthismemoisunlimited.CopyrightNoticeCopyright(C)TheInternetSociety(2001).AllRightsReserved.AbstractThisstandardspecifiesasyntaxfortextmessagesthataresentbetweencomputerusers,withintheframeworkofelectronicmailmessages.ThisstandardsupersedestheonespecifiedinRequestForComments(RFC)822,StandardfortheFormatofARPAInternetTextMessages,updatingittoreflectcurrentpracticeandincorporatingincrementalchangesthatwerespecifiedinotherRFCs.TableofContents1.Introduction...............................................31.1.Scope....................................................31.2.Notationalconventions...................................41.2.1.Requirementsnotation..................................41.2.2.Syntacticnotation.....................................41.3.Structureofthisdocument...............................42.LexicalAnalysisofMessages...............................52.1.GeneralDescription......................................52.1.1.LineLengthLimits.....................................62.2.HeaderFields............................................72.2.1.UnstructuredHeaderFieldBodies.......................72.2.2.StructuredHeaderFieldBodies.........................72.2.3.LongHeaderFields.....................................72.3.Body.....................................................83.Syntax.....................................................93.1.Introduction.............................................93.2.LexicalTokens...........................................9ResnickStandardsTrack[Page1]RFC2822InternetMessageFormatApril20013.2.1.PrimitiveTokens.......................................93.2.2.Quotedcharacters......................................103.2.3.Foldingwhitespaceandcomments.......................113.2.4.Atom...................................................123.2.5.Quotedstrings.........................................133.2.6.Miscellaneoustokens...................................133.3.DateandTimeSpecification..............................143.4.AddressSpecification....................................153.4.1.Addr-specspecification................................163.5Overallmessagesyntax....................................173.6.Fielddefinitions........................................183.6.1.Theoriginationdatefield.............................203.6.2.Originatorfields......................................213.6.3.Destinationaddressfields.............................223.6.4.Identificationfields..................................233.6.5.Informationalfields...................................263.6.6.Resentfields..........................................263.6.7.Tracefields...........................................283.6.8.Optionalfields........................................294.ObsoleteSyntax............................................294.1.Miscellaneousobsoletetokens............................304.2.Obsoletefoldingwhitespace.............................314.3.ObsoleteDateandTime...................................314.4.ObsoleteAddressing......................................334.5.Obsoleteheaderfields...................................334.5.1.Obsoleteoriginationdatefield........................344.5.2.Obsoleteoriginatorfields.............................344.5.3.Obsoletedestinationaddressfields....................344.5.4.Obsoleteidentificationfields.........................354.5.5.Obsoleteinformationalfields..........................354.5.6.Obsoleteresentfields.................................354.5.7.Obsoletetracefields..................................364.5.8.Obsoleteoptionalfields...............................365.SecurityConsiderations....................................366.Bibliography...............................................377.Editor’sAddress...........................................388.Acknowledgements...........................................39AppendixA.Examplemessages..................................41A.1.Addressingexamples......................................41A.1.1.Amessagefromonepersontoanotherwithsimpleaddressing.............................................41A.1.2.Differenttypesofmailboxes...........................42A.1.3.Groupaddresses........................................43A.2.Replymessages...........................................43A.3.Resentmessages..........................................44A.4.Messageswithtracefields...............................46A.5.Whitespace,comments,andotheroddities................47A.6.Obsoletedforms..........................................47ResnickStandardsTrack[Page2]RFC2822InternetMessageFormatApril2001A.6.1.Obsoleteaddressing........................