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1、单击此处编辑主标题单击此处编辑副标题单击此处编辑标题正文部分样例A正文部分样例B正文部分样例C正文部分样例D正文部分样例I正文部分样例II正文部分样例III单击此处编辑标题正文部分样例A正文部分样例B正文部分样例C正文部分样例D正文部分样例I正文部分样例II正文部分样例III正文标题第一级第二级第三级第四级第五级正文标题第一级第二级第三级第四级第五级样例文本AGemmiCong精美PPT模板尽在如下豆单http://www.docin.com/d-326.html&forward=2欢迎大家欣赏和下载样例文本AGemmiCong精美P
2、PT模板尽在如下豆单http://www.docin.com/d-326.html&forward=2欢迎大家欣赏和下载样例文本BThearticleaboutsenderrewritingcontainstechnicalbackgroundinfoabouttheearlySMTPhistoryandsourceroutingbeforeRFC1123.Sendmailwasoneofthefirst(ifnotthefirst)mailtransferagentstoimplementSMTP.[citationneeded]S
3、omeotherpopularSMTPserverprogramsincludePostfix,qmail,NovellGroupWise,Exim,NovellNetMail,MicrosoftExchangeServer,SunJavaSystemMessagingServer.Messagesubmission(RFC2476)andSMTP-AUTH(RFC2554)wereintroducedin1998and1999,bothdescribingnewtrendsine-maildelivery.Originally,SM
4、TPserversweretypicallyinternaltoanorganization,receivingmailfortheorganizationfromtheoutside,andrelayingmessagesfromtheorganizationtotheoutside.Butastimewenton,SMTPservers(Mailtransferagents),inpractice,wereexpandingtheirrolestobecomemessagesubmissionagentsforMailuserag
5、ents,someofwhichwerenowrelayingmailfromtheoutsideofanorganization.(e.g.acompanyexecutivewishestosende-mailwhileonatripusingthecorporateSMTPserver.)Thisissue,aconsequenceoftherapidexpansionandpopularityoftheWorldWideWeb,meantthatSMTPhadtoincludespecificrulesandmethodsfor
6、relayingmailandauthenticatinguserstopreventabusessuchasrelayingofunsolicitede-mail(spam).样例文本BThearticleaboutsenderrewritingcontainstechnicalbackgroundinfoabouttheearlySMTPhistoryandsourceroutingbeforeRFC1123.Sendmailwasoneofthefirst(ifnotthefirst)mailtransferagentstoim
7、plementSMTP.[citationneeded]SomeotherpopularSMTPserverprogramsincludePostfix,qmail,NovellGroupWise,Exim,NovellNetMail,MicrosoftExchangeServer,SunJavaSystemMessagingServer.Messagesubmission(RFC2476)andSMTP-AUTH(RFC2554)wereintroducedin1998and1999,bothdescribingnewtrendsi
8、ne-maildelivery.Originally,SMTPserversweretypicallyinternaltoanorganization,receivingmailfortheorganizationfro
