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1、外文资料原文SMTPServiceExtensionforAuthenticationRFC2554ThisdocumentspecifiesanInternetstandardstrackprotocolfortheInternetcommunity,andrequestsdiscussionandsuggestionsforimprovements.Pleaserefertothecurrenteditionofthe"InternetOfficialProtocolStandards"(STD1)forthestandardizationstateandstatusofthisprot
2、ocol.Distributionofthismemoisunlimited.Thereareusuallytwooperatingmodes:SMTPtosendandreceiveSMTP.Specificway:tosendSMTPmailinthereceiveduserrequesttodeterminewhetherthise-maillocalmail,ifsenttotheuser'smailboxdirectinvestment,ortochecktheremotemailserverdnsMXrecord,andtheestablishmentoftheremoterec
3、eivedatwo-waybetweentheSMTPtransmissionchannel,thenbythesendingSMTPcommandissuedbythereceivingSMTPtoreceive,andanswerthecounter-sidedelivery.Oncethetransmissionchannelisestablished,SMTPMAILcommandspecifyingthesendersendsthemessagesender.IftherecipientcanreceivemailSMTPOKresponseisreturned.SMTPRCPTc
4、ommandissuedforthesendertoconfirmwhetherthemessageisreceived.IftheSMTPrecipientreceives,itreturnsOKresponse;ifyoucannotreceive,thenrefusedtoacceptresponsetoissue(butdoesnotsuspendoperationoftheentiremessage),thetwosideswillrepeatsomanytimes.Whentherecipientsreceiveallmessageswillreceiveaspecialsequ
5、ence,iftherecipientofthemessagesuccessfullyprocessed,itreturnsOKresponse.SMTPcommandsdefinethemailtransferorbyuser-definedsystemfunctions.ItscommandisEndofthestring.Inthecasewithparameters,thecommanditselfisandtheparametersseparately,ifnotdirectly,andwithparametersConnection.Mailbox
6、syntaxandreceivingsitesmustbeconsistentwiththeform.SMTPcommandsandresponsesarediscussedbelow.Sende-mailoperationsinvolvingdifferentdataobjects,theirmutualconnectionbydifferentparameters.ReplyPathparameteristheMAILcommand,theforwardpathistheRCPTcommandparameter,themessagedateistheDATAcommand.Thesear
7、gumentsordataobjectsmustfollowthecommand.Thismodelalsorequiresadifferentbuffertostoretheobjects,thatis,thereisapathbackbuffer,aforwardpathbuffer,thecontentsofamessagebuffer.Thecommandgeneratesitsownspecific
