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Introduction TheSMTP[1]isusedasthebasisformost electronicmail.EmailisthemostpopularInternet servicenow[2],anditallowspeopletocommuni-catebyexchangingelectronicmessagesglobally.Thesemessagescanbedeliveredinafewseconds toacoupleofhours.Anaddedattractionisthe relativelylowcostofsendinglargemessages.Combined,thesebenefitsgiveusersaconvincing argumentforaccesstoemail,andthustheconnec-tionoftheirsystemstotheInternet.SMTPisasimpleprotocolandcontainsonlya fewbasiccommands.Thereareseveralsecurity … 相似文献
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