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1、外文文献资料SMTPServiceExtensionforAuthenticationThisdocumentspecifiesanInternetstandardstrackprotocolfortheInternetcommunity,andrequestsdiscussionandsuggestionsforimprovements.Pleaserefertothecurrenteditionofthe"InternetOfficialProtocolStandards"(STD1)forthestandard
2、izationstateandstatusofthisprotocol.Distributionofthismemoisunlimited.Thereareusuallytwooperatingmodes:SMTPtosendandreceiveSMTP.Specificway:tosendSMTPmailinthereceiveduserrequesttodeterminewhetherthise-maillocalmail,ifsenttotheuser'smailboxdirectinvestment,orto
3、checktheremotemailserverdnsMXrecord,andtheestablishmentoftheremotereceivedatwo-waybetweentheSMTPtransmissionchannel,thenbythesendingSMTPcommandissuedbythereceivingSMTPtoreceive,andanswerthecounter-sidedelivery.Oncethetransmissionchannelisestablished,SMTPMAILcom
4、mandspecifyingthesendersendsthemessagesender.IftherecipientcanreceivemailSMTPOKresponseisreturned.SMTPRCPTcommandissuedforthesendertoconfirmwhetherthemessageisreceived.IftheSMTPrecipientreceives,itreturnsOKresponse;ifyoucannotreceive,thenrefusedtoacceptresponse
5、toissue(butdoesnotsuspendoperationoftheentiremessage),thetwosideswillrepeatsomanytimes.Whentherecipientsreceiveallmessageswillreceiveaspecialsequence,iftherecipientofthemessagesuccessfullyprocessed,itreturnsOKresponse.SMTPcommandsdefinethemailtransferorbyuser-d
6、efinedsystemfunctions.ItscommandisEndofthestring.Inthecasewithparameters,thecommanditselfisandtheparametersseparately,ifnotdirectly,andwithparametersConnection.Mailboxsyntaxandreceivingsitesmustbeconsistentwiththeform.SMTPcommandsandresponsesare
7、discussedbelow.Sende-mailoperationsinvolvingdifferentdataobjects,theirmutualconnectionbydifferentparameters.ReplyPathparameteristheMAILcommand,theforwardpathistheRCPTcommandparameter,themessagedateistheDATAcommand.Theseargumentsordataobjectsmustfollowthecommand
8、.Thismodelalsorequiresadifferentbuffertostoretheobjects,thatis,thereisapathbackbuffer,aforwardpathbuffer,thecontentsofamessagebuffer.Thecommandgeneratesitsownspecificbuffer,
