e-mail

History

Origin

Fortheworld’sfirste-mail(e-mail),accordingtothedata,therearetwowaysofsaying:

Thefirststatement

Thefirste-mailintheworldinOctober1969wasabriefmessagesentbycomputerscientistProfessorLeonardK.tohiscolleague.

AccordingtoInternetWeekly’sreport,theworld’sfirste-mailwasabriefmessagesentbycomputerscientistProfessorLeonardK.tohiscolleague(thetimeshouldbeOctober1969).Themessagehasonlytwoletters:"LO".ProfessorLeonardK.isthereforecalledtheFatherofEmail.

ProfessorLeonardK.explained,“Backthen,ItriedtouseacomputerattheUniversityofCaliforniatoconnectwithanothercomputerattheStanfordResearchCenternearSanFrancisco.WhatwedidwasloginfromacomputerToanothercomputer.ThewaytologinatthattimewastotypeLOG.SowetypedinL,andthenaskedtheotherparty:'HaveyoureceivedL?'Theotherpartyreplied:'Received.'ThentypeOandGinturn.NotyetreceivedWhentheotherpartyreceivestheconfirmationanswerfromG,thesystemisparalyzed.Sothefirstonlinemessageis'LO',whichmeans'Hello!'"

Thesecondwayofsaying

In1971,theArpanetfundedbytheU.S.DepartmentofDefensewasinfullswing.Averyacuteproblememerged:thescientistsparticipatinginthisprojectweredoingdifferentjobsindifferentplaces,butButtheycan’tsharetheirresearchresultswell.Thereasonissimple,becauseeveryoneusesdifferentcomputers,andeveryone'sworkisuselesstoothers.Theyurgentlyneedawaytotransferdatabetweendifferentcomputersbymeansofthenetwork.RayTomlinson,Ph.D.fromtheMassachusettsInstituteofTechnologywhoworksforARPANET,combinedasoftwarethatcanbecopiedbetweendifferentcomputernetworksandacommunicationsoftwarethatisonlyusedforasinglecomputer,andnameditSNDMSG(SendMessage).Totest,heusedthissoftwaretosendthefirstemailonAPA.Therecipientwashimselfonanothercomputer.Althoughthecontentofthisemailcan'tevenberememberedbyTomlinsonhimself,themomentstillhasfullhistoricalsignificance:emailwasborn.Tomlinsonchosethe"@"symbolasthegapbetweentheusernameandtheaddress,becausethissymbolisrelativelyuncommonandwillnotappearinanyone'sname,andthepronunciationofthissymbolalsohasthemeaningof"being".Arpanetscientistswelcomedthisearth-shatteringinnovationwithgreatenthusiasm.Theirgeniusideasandresearchresultscannowbesharedwithcolleaguesatthefastest--fasterthanimperceptible--speed.Inretrospect,manypeoplefeelthatemailhascontributedtothegreatsuccessofArpa.com.(Thisstatementisalsomorewidelyspread.)

History

Althoughe-mailwasinventedinthe1970s,itonlyemergedinthe1980s.Thesilenceinthe1970swasmainlyduetothefactthatthereweretoofewpeopleusingtheArpanetnetworkatthattime,andthenetworkspeedwasonlyonetwentiethofthestandard56Kbpsspeed.LimitedbythespeedoftheInternet,usersatthattimecouldonlysendsomeshortmessages,anddon’timaginesendingalotofphotoslikethat;bythemid-1980s,withtheriseofpersonalcomputers,e-mailbegantospreadwidelyamongcomputerfansandcollegestudents;toInthemid-1990s,whentheInternetbrowserwasborn,thenumberofnetizensworldwideincreasedsharply,ande-mailwaswidelyused.

AbriefhistoryofEudora

Thefirstprogramthatmadee-mailmainstreamwasEuroda,whichwaswrittenbySteveDownallin1988.SinceEurodawasthefirste-mailmanagementprogramwithagraphicalinterface,itquicklybecamethemaine-mailprogramusedbycompaniesanduniversitycampuses.

However,Euroda'spositiondidnotlastlong.WiththeriseoftheInternet,NetscapeandMicrosofthavesuccessivelylaunchedtheirbrowsersandrelatedprograms.MicrosoftanditsdevelopmentofOutlookmadeEurodagraduallydecline.

Inthepast5years,thebiggestchangeine-mailhasbeentheriseofInternet-basede-mail.Peoplecanmaintaintheirmailaccountsonthemailwebsitethroughanynetworkedcomputer,insteadofusingmailonlyontheirhomeorcompanynetworkedcomputers.ThiskindofmailispromotedbyHotmail.Today,Hotmailhasbecomeapopularwebsite.MicrosoftannouncedinAugustthatthemailservicehasreached110millionusers.ButwhenMicrosoftboughtthesitein1998,itonlyspent$400million,apricethatlatermadeHotmailcreatorShabirBukhatilregretted.

ThesuccessofHotmailinspiredalargenumberofcompetitors,andsoone-mailbecameamust-haveserviceforportalsites,suchasYahoo,netscape,ExiciteandLycos,allofwhichhavetheirowne-mailservices.

Principle

Thesendingandreceivingofemail

TheprincipleofsendingandreceivingemailsontheInternetcanbevividlyusedinourdailylifetosendpackages.Description:Whenwewanttosendapackage,wemustfirstfindanypostofficewiththisservice.Afterfillingintherecipient’sname,address,etc.,thepackageissenttothepostofficewheretherecipientislocated,thentheotherpartyYoumustgotothispostofficewhenyoupickupthepackage.Similarly,whenwesendane-mail,themailissentbythemailsendingserver(anyoneisfine),andtherecipient’smailreceivingserverisjudgedaccordingtotherecipient’saddressandsenttothatserver.Thebelievercanonlyaccessthisservertoreceivemail.

1.Sendingofe-mails

SMTPisaprotocolthatmaintainstheorderoftransmissionandstipulateswhattasksareperformedbetweenmailservers.Itsgoalistotransmite-mailsreliablyandefficiently.SMTPisindependentofthedeliverysubsystemandcanrelaymail.

SMTPisbasedonthefollowingcommunicationmodel:Accordingtotheuser'smailrequest,thesenderSMTPestablishesatwo-waychannelwiththereceiverSMTP.ThereceiverSMTPcanbetheultimatereceiveroranintermediatesender.ThesenderSMTPgeneratesandsendsSMTPcommands,andthereceiverSMTPreturnsresponseinformationtothesenderSMTP.

Aftertheconnectionisestablished,thesenderSMTPsendsaMAILcommandtoindicatethesender,andifthereceiverSMTPapprovesit,anOKresponsewillbereturned.ThesenderSMTPsendstheRCPTcommandtoindicatetherecipient.IfthereceiverSMTPalsoapprovesit,itwillreturnanOKresponseagain;otherwise,itwillgivearejectionresponse(butnotstoptheentiremailsendingoperation).Whentherearemultiplerecipients,bothpartieswillrepeatthismanytimes.Afterthisprocessisover,thesenderSMTPstartstosendthemailcontentandterminateswithaspecialsequence.IftherecipientSMTPsuccessfullyprocessesthemail,itreturnsanOKresponse.

Forthesituationwhererelayforwardingisrequired,ifanSMTPserveracceptstheforwardingtask,butlaterfindsthatthemailcannotbesentduetotheincorrectforwardingpathorotherreasons,thenitmustsenda"MailUndeliverable"ThemessageissenttotheSMTPserverthatoriginallysenttheletter.InordertopreventtheerrormessagefrombeingsentcyclicallybetweentwoSMTPserversbecausethemessagemayfailtobesent,thefallbackpathofthemessagecanbeleftblank.

2.E-mailreception

E-mailprotocolversion3(POP3)

TomaintainamessagetransmissiononarelativelysmallnodeontheInternetThesystem(MTS,MessageTransportSystem)isunrealistic.Forexample,aworkstationmaynothaveenoughresourcestoallowtheSMTPserverandrelatedlocalmaildeliverysystemtoresideandcontinuetooperate.Similarly,thecostofrequiringapersonalcomputertobeconnectedtotheIPnetworkforalongtimeishuge,andsometimesitisimpossibletodoso.Nevertheless,itisoftenusefultoallowmailmanagementonsuchsmallnodes,andtheyareusuallyabletosupportauseragentthatcanbeusedtomanagemail.Tomeetthisneed,nodesthatcansupportMTScanprovidemailstoragefunctionsforthesesmallnodes.POP3isusedtoprovidesuchapracticalwaytodynamicallyaccesse-mailstoredonthemailserver.Generallyspeaking,itmeanstoallowtheuser'shosttoconnecttotheservertoretrievethemailthattheservertemporarilystoresforit.POP3doesnotprovidemorepowerfulmanagementfunctionsformail,anditisusuallydeletedafteritisdownloaded.MoremanagementfunctionsareimplementedbyIMAP4.

ThemailserverstartsPOP3servicebylisteningonTCPport110.WhentheuserhostneedstousethePOP3service,aTCPconnectionisestablishedwiththeserverhost.Whentheconnectionisestablished,theserversendsaconfirmationmessageindicatingthatitisready,andthenthetwopartiesalternatelysendcommandsandresponsestoobtainthemail.Thisprocesscontinuesuntiltheconnectionisterminated.APOP3instructioniscomposedofacommandthathasnothingtodowithcaseandsomeparameters.CommandsandparametersuseprintableASCIIcharacters,separatedbyspaces.Thecommandisgenerally3to4letters,buttheparametercanbeaslongas40characters.

InternetMessageAccessProtocolversion4(IMAP4)

IMAP4providesameanstomanagemailonaremotemailserver,anditcanprovideuserswithselectivereceptionfromthemailserverFunctionssuchasmail,server-basedinformationprocessingandsharedmailboxes.IMAP4allowsuserstocreatefoldersforstoringmailinanyhierarchicalstructureonthemailserver,andflexiblymovemailbetweenfolders,andorganizetheirmailboxesastheylike,whilePOP3canonlyrelyonthesupportofuseragentslocally.Achievethesefunctions.Iftheuseragentsupportsit,thenIMAP4canevenrealizethefunctionofselectivelydownloadingattachments.Assumingthatanemailcontains5attachments,theusercanchoosetodownload2oftheminsteadofall.

SimilartoPOP3,IMAP4onlyprovidesuser-orientedmailsendingandreceivingservices.ThesendingandreceivingofmailontheInternetstillreliesontheSMTPservertocomplete.

Thecompositionofanemailaddress

Theformatofanemailaddressconsistsofthreeparts.Thefirstpart"USER"representstheaccountoftheusermailbox.Forthesamemailreceivingserver,thisaccountmustbeunique;thesecondpart"@"istheseparator;thethirdpartisthedomainnameofthemailreceivingserveroftheusermailbox.Tomarkitslocation.

Addressformat

Useridentifier+@+domainname

Amongthem:@isthesymbolof"at",whichmeans"in".

Heredomain_nameistheidentifierofthedomainname,thatis,thedomainnameofthemaildestinationtowhichthemailmustbedelivered.Andsomebodyistheemailaddressonthedomainname.Thesuffixgenerallyrepresentsthenatureofthedomainnameandtheregioncode.Thedomainnameisreallytechnicallyamailexchange,notamachinename.

Commone-mailprotocolsareasfollows:SMTP(SimpleMailTransferProtocol),POP3(PostOfficeProtocol),IMAP(InternetMailAccessProtocol).ThesetypesofprotocolsaredefinedbytheTCP/IPprotocolsuite.

SMTP(SimpleMailTransferProtocol):SMTPismainlyresponsibleforhowtheunderlyingmailsystemtransfersmailfromonemachinetoanother.

POP(PostOfficeProtocol):TheversionisPOP3,whichisaprotocolfortransferringmailfromane-mailboxtoalocalcomputer.

IMAP(InternetMessageAccessProtocol):TheversionisIMAP4,whichisanalternativetoPOP3.Itprovidesnewfunctionsformailretrievalandmailprocessing,sothatuserscanseeitwithoutdownloadingthebodyofthemailatallThetitlesummaryofthemail,fromthemailclientsoftware,youcanoperatethemailandfolderdirectoriesontheserver.TheIMAPprotocolenhancestheflexibilityofe-mail,andatthesametimereducesthedirectharmofspamtothelocalsystem,andatthesametimerelativelysavesthetimeforuserstochecke-mail.Inaddition,theIMAPprotocolcanrememberthattheuser'soperationsonemails(suchasmovingemails,deletingemails,etc.)whentheuserisofflinewillbeautomaticallyexecutedthenexttimethenetworkconnectionisopened.

SupportforSSLconnectionisintegratedinmostpopularemailclientprograms.

Inaddition,manyencryptiontechnologiesarealsoappliedtotheprocessofsending,receivingandreadingemails.Theycanprovideencryptionstrengthrangingfrom128bitsto2048bits.Bothone-wayencryptionandsymmetrickeyencryptionarealsowidelysupported.

Features

E-mailisasystemthatdirectlyfacestheexchangeofinformationbetweenpeopleintheentirenetworkandallothernetworksystems.Itsdatasenderandreceiverarebothpeople.,Soitgreatlymeetsthecommunicationneedsofalargenumberofpeople.

E-mailreferstoacommunicationmethodthatuseselectronicmeanstosendletters,receipts,materialsandotherinformation.E-mailintegratesthecharacteristicsoftelephonecommunicationandpostalletters.Ittransmitsinformationasfastasatelephone,andcanmaketherecipientreceivewrittenrecordsatthereceivingendjustlikealetter.E-mailsystemisalsocalledcomputer-basedmailmessagesystem.Itparticipatesintheentireprocessingprocessfromthemailenteringthesystemtothemailreachingthedestination.E-mailcanbetransmittednotonlybythetelephonenetwork,butalsobyanyothercommunicationnetwork.Whenusingthetelephonenetwork,itcanalsotransmitinformationduringoff-peakperiods,whichhasspecialvalueforcommercialmail.Anelectronicsystemforlimiteduserscontrolledbyacentralcomputerandasmallcomputercanberegardedasacomputerconferencesystem.E-mailusesthestore-and-forwardmethodtograduallytransmitinformationonthenetwork,whichisnotasdirectandtimelyasthetelephone,butthecostislow.

Inshort,itmeans

1. Fastspreadingspeed

2. Veryconvenient

3. Lowcost

4. Awiderangeofcommunicationpartners

5. Diversifiedinformation

6. Moresecure

System

E-mailservicesareprovidedbydedicatedservers,Gmail,Hotmail,NetEasemailboxes,MailboxservicessuchasSinaMailarealsobuiltonthebasisofemailservers,butthesystemsoflargemailserviceprovidersaregenerallyself-developedorimplementedbysecondarydevelopmentofothertechnologies.Themaine-mailservermainlyhasthefollowingtwomajorblocks:

1.MailsystembasedonUnix/Linuxplatform

1.Sendmailmailsystem(supportSMTP)anddovecotmailsystem(SupportPOP3)

Sendmailcanbesaidtobetheoriginatorofmail,withahistoryofmorethan50years.

BandangMailisatypicalrepresentativeamongthem

2.MailsystembasedonPostfix/Qmail.Postfix/QmailtechnologyisdevelopedonSendmailtechnologyandhasahistoryofnomorethan10years.Forexample,theMTAofNetEasemailboxisbasedonPostfix,andthemailboxofYahooisbasedonQmailsystem.

2.MailsystembasedonWindowsplatform

1.MicrosoftExchangemailsystem.

2.IBMLotusDominomailsystem.

3.Scalixmailsystem.

4.Zimbramailsystem.

5.MDeamonmailsystem.

TheExchangemailsystemiseasytomanagebecauseitisintegratedwithWindows.Itisthemostusedmailsystemintheenterprise.IBMLotusDominohasstrongcomprehensivefunctionsandisusedbylargeenterprises.ThePostfix-basedmailsystemrequiresstrongtechnicalforcetoachieve,buttheperformancecanreachveryhigh,andthesecurityisverygood.Atthesametime,thesoftwareisopensourceandfree..

Chooseanemail

Emailselection

Beforechoosinganemailserviceprovider,wemustunderstandwhatthepurposeofusingemailis.Accordingtoourdifferentpurposes,thereareChoosepertinently.

Ifyouoftencontactforeigncustomers,itisrecommendedtouseaforeigne-mailaddress.SuchasGmail,Hotmail,MSNmail,Yahoomail,etc.

Ifyouwanttouseitasanetworkharddriveandoftenstoresomepicturesandmaterials,thenyoushouldchooseamailboxwithalargestoragecapacity,suchasGmail,Yahoomail,NetEase163mail,126mail,yeahmail,TOMMail,21CNmail,etc.areallgoodchoices.

Ifyouhaveacomputer,you'dbetterchooseamailboxthatsupportsthePOP/SMTPprotocol.Youcandownloadthemailtoyourharddiskthroughmailclientsoftwaresuchasoutlook,foxmail,soyoudon'thavetoworryaboutthesizeofthemailboxNotenough,butitcanalsopreventothersfromstealingyourpasswordandpeekingatyourletter.Ofcourse,thepremiseisnottokeepacopyontheserver.Irecommendthismainlyfromasecurityperspective.

Ifyouoftenneedtosendandreceivelargeattachments,Gmail,Yahoomail,Hotmail,MSNmail,NetEase163mail,126mail,Yeahmail,etc.canallmeettherequirements.

Ifyouwanttoknowyournewmailinthefirsttime,itisrecommendedtouseChinaMobile'sMonternetXpressMail.Whenthereisanemail,therewillbeamobilephoneSMSnotification.ChinaUnicomuserscanchoosetheRuyimailbox.

IfitisonlyusedinChina,thenQQmailboxisalsoagoodchoice.AnemailaddresswithaQQnumberallowsyourfriendstosendinstantmessagestoyouthroughQQ.Ofcourseyoucanalsousealiasmailboxes.Inaddition,withTencent'sacquisitionoffoxmail,Tencent'stechnologyinthefieldofe-mailhasbeengreatlystrengthened.Therefore,itshouldbesafetouseQQmailbox.

Inaddition,youcanchoosealocalmailboxaccordingtoyourarea.Forexample,friendsinBeijingcanchooseQianlong.commailbox,andfriendsinGuangzhoucanchoose21CNmailbox.

Friendswhousepaidmailboxesshouldpayattentiontowhetherthecost-effectivenessofthemailboxisworthbuying,andalsoseeiftheycanpayforitinthelong-term.NeteaseVIPmailboxesand188WealthMailareverygood,especiallyiftheyprovidemoreThiskindofbusinesscarddesignschemeisveryuser-friendly,anditishighlyrecommendedforeveryonetouseit.

Youcanalsousethemailboxprovidedbyyourownbroadbandserviceprovider.Forexample,Tietonguserscanchoosethe68CNenterprisenew-speedmailbox.

Manypeoplehaveamisunderstandingaboutthesizeofattachmentsthatsupportsendingandreceiving.Manypeoplethinkthatitmustbelarge.Infact,generallyspeaking,somedataattachmentsdonotexceed3MB.Whentheattachmentsarelarge,theycanbecompressedbyWinZIP,WinRARandothersoftwarebeforesending.Mailboxesbasicallysupportattachmentsofmorethan4MB,andwell-knownmailboxeshaveprovidedmorethan10MBofattachmentssendingandreceivingspace.Anotherissuethatcannotbeignoredisthatyourmailboxsupportslargeattachments.Doesyourfriend'smailboxalsosupportlargeattachments?Ifyoucansendlargeattachmentsandyourfriend'smailboxdoesnotsupportacceptinglargeattachments,itismeaninglessthatyourmailboxcansupportlargeattachments,sothisquestionisnotimportant.

YoucanalsochooseyouremailaccordingtoyourmostcommonlyusedIMinstantmessagingsoftware.YoucanuseQQemailifyouuseQQ,YahooemailifyouoftenuseYahooMessenger,andMSNorHotmailifyouoftenuseMSN.Ofcourse,otheremailaddressescanalsoberegisteredasMSNaccountstouse.ThosewholiketouseNetEaseBubbleuseNetEase163mailbox.

Thereisanotherimportantissuethatcannotbeignored.Inthedesktopoperatingsystem,Windowsoperatingsystemoccupies90%oftheusualshare.Inotherwords,10%ofmyfriendsuseLinuxandAppleoperatingsystems.Becausethefirefoxbrowsercan’tsupportmanyjavascriptsinwebpages,itisdifficultfornovicestoconfigurethebrowser,whichmeansthatitmaybedifficulttoaccessthemailboxthroughtheWEB,sothesefriendsmustchoosetosupportPOP/SMTPThefunctionalmailboxcansendandreceiveemailsthroughKmailandotherclientsoftware.AndfriendswhouseLinuxandAppleUnixoperatingsystemsdonotrecommendMSNmailandHotmail,exceptthattheydonotsupportPOP/SMTP,becausetheyareMicrosoft'scompetitors,inordertopreventMicrosoftfromimproperlyblockingmailsendingandreceiving,sousetheaboveFriendsoftheoperatingsystemarebestnottouseHotmailandMSNmail.ThereisnoofficialMSNsoftwareofMicrosoftontheseoperatingsystems.Youcanonlyusetheplug-inofthechattooltoimplementsomeofthefunctionsofMSN.

Commone-mailaddresses

MicrosoftEmail(Microsoft)

Exchangemailbox(SunshineInternet)

Outlookmail(Microsoft)

MSNmail(Microsoft)

Gmail(Google)

35mail(35Internet)

Yahoomail(Yahoo)

QQmail(Tencent)

FOXMAIL(Tencent)

163mailbox(NetEase)

126mailbox(NetEase)

188Mailbox(Netease)

21CNmailbox(CenturyDragon)

139mailbox(mobile)

189mailbox(telecommunications)

MonternetFreeMail

XinhuaMailbox

People'sMailbox

ChinaNetMailbox

SinaMailbox

CommonProcessingSoftware

TheBat!

WindowsLiveMailDesktop

KooMail

DreamMailDreamMail

Becky!

Foxmail

WeChat

IncrediMail

MozillaThunderbird

OutlookExpress

MailWasher

Emailaggregator

Generally,selectemailfrom"Informationsecurity,anti-spam.Anti-virus,mailboxcapacity,stability,sendingandreceivingspeed,long-termuse,mailboxfunction,Whetheritisconvenientandprecisetosearchandsort,whetherthecontentofthemailcanbeeasilymanaged,whetheritisconvenienttouse,multiplewaysofsendingandreceiving,etc.Comprehensiveconsideration.Everyonecanchoosethemostsuitablemailboxaccordingtotheirownneeds.

Workingprocess

1.E-mailsystemisanewtypeofinformationsystem,whichistheproductofthecombinationofcommunicationtechnologyandcomputertechnology.

E-mailtransmissionissimpleviae-mailThesimplemailtransferprotocol(SMTP)isasystemsoftwaretocomplete,whichisane-mailcommunicationprotocolundertheInternet.

2.Thebasicprincipleofe-mailistosetuponacommunicationnetwork"E-mailboxsystem",itisactuallyacomputersystem.

Thehardwareofthesystemisahigh-performance,large-capacitycomputer.Theharddiskisusedasthestoragemediumofthemailbox,andacertainamountofstorageisallocatedtotheuserontheharddisk.Spaceservesastheuser’s"mailbox",andeachuserhashisowne-mailbox.MakesurethatoneTheusernameandpasswordthattheusercanmodifyatwill.Thestoragespaceincludesthreeparts:storageofreceivedletters,editingletters,andletterarchiving.Usersusepasswordstoopentheirmailboxesandperformvariousoperationssuchassending,reading,editing,forwarding,andarchiving.Thesystemfunctionismainlyrealizedbysoftware.

3.E-mailcommunicationiscarriedoutbetweenmailboxes.

Theuserfirstopenshisownmailbox,andthensendsthemailtobesenttotheotherparty'smailboxbytypingacommand.Mailisdeliveredandexchangedbetweenmailboxes,andcanalsobedeliveredandexchangedwithanothermailsystem.Whenreceivingtheletter,therecipientusesaspecificaccounttoretrieveitfromthemailbox.

Theworkingprocessofe-mailfollowstheclient-servermodel.Thesendingofeache-mailinvolvesthesenderandthereceiver.Thesenderconstitutesaclient,andthereceiverconstitutesaserver.Theservercontainsthee-mailboxesofmanyusers.Thesendersendstheeditedemailtothepostofficeserver(SMTPserver)throughthemailclientprogram.Thepostofficeserverrecognizestherecipient'saddressandsendsamessagetothemailserver(POP3server)thatmanagestheaddress.Themailserverstoresthemessageintherecipient'se-mailboxandinformstherecipientofthearrivalofnewmail.Aftertherecipientconnectstotheserverthroughthemailclientprogram,hewillseethenotificationfromtheserver,andthenopenhisowne-mailboxtocheckthemail.

Usually,individualusersontheInternetcannotdirectlyreceivee-mails.Instead,theyapplyforane-mailboxoftheISPhost,andtheISPhostisresponsibleforreceivinge-mails.Oncetheuser'semailarrives,theISPhostwillmovetheemailtotheuser'semailboxandnotifytheuserthatthereisanewemail.Therefore,whensendinganemailtoanothercustomer,theemailisfirstsentfromtheuser'scomputertotheISPhost,thentotheInternet,thentotherecipient'sISPhost,andfinallytotherecipient'spersonalcomputer.

TheISPhostactsasa"postoffice"andmanagesthee-mailboxesofmanyusers.Thee-mailboxofeachuserisactuallytheaccountnamethattheuserhasappliedfor.Eachuser’se-mailmailboxoccupiesacertaincapacityoftheharddiskspaceoftheISPhost.Becausethisspaceislimited,usersshouldcheckandreadthee-mailsinthee-mailboxregularlytomakeroomtoreceivenewmail.

Tips

Findemailsquickly

It’snoteasytofindwhatyouwantinalotofemails.The“Findemails”optionallowsuserstoSearchmailinmultiplefolderstofindanymailinafolderorsubfolder.Clickthe"Edit"menuandselect"FindMail".Anyofthefollowingconditionscanbethecriteriaforfindingthemail:whosentthemail,thesubjectortitleofthemail,thetextinthemail,etc.

Automaticallyaddsignature

InOutlookExpress5,usethefollowingmethodstorealizetheautomaticsignaturefunction:

(1)AfterstartingOutlookExpress,selectthe"ToolOptions"command

(2)Inthe"Options"dialogbox,clickthe"Signature"tab

(3)Inthe"Signature"tab,click"AddthistoalloutgoingmailTheboxinfrontof“Signature”isselectedsothattheautomaticsignaturefunctiontakeseffect

(4)Inthe“Signature”box,createanewsignaturename,andtypeinthetextboxyouwanttoaddAllpersonalinformation,suchasname,contactaddress,phonenumber,etc.

(5)Ifyouwanttoautomaticallyaddasignaturewhenreplyingtoandforwardingemails,youcanclick"Don’taddsignaturestoreplyingandforwardingemails",makeitunchecked

(6)Clickthe"OK"button,andthenexttimeyoucreateanewemail,youremailwillbeautomaticallyaddedwithasignature.Ofcourse,youcanclickthe"Advanced"buttontosetabeautifulsignatureforeachofyouraccounts.

Rejectspam

Select"InboxAssistant"inthe"Tools"menubar,andclick"Add".Thewindowisdividedintotwoparts,theupperandlowerpart,theupperpartis"Processingconditions",thefollowingis"processingmethods".Forexample,ifyouoftenreceivespamemails,ifyouwanttostopreceivingitfromnowon,youcanselect"Sender"inthe"ProcessingConditions"columnandfillintheaboveaddress;then,select"ProcessingMethod""Deletefromtheserver";afterclicking"OK",youcanseethedescriptioninthedescriptionbox,thendeletedirectlyfromtheserver",whichachievesthepurpose.

Backupaddressbook

InOutlookExpress,theaddressbookisveryimportant.Itrecordsallyourcommunicationaddresses.However,forsomereasons,whenyouneedtoreinstallthesystemorformatthedisk,thebackupoftheaddressbookisveryimportant..Findafilenamedusername.wabinthe"C:windows\ApplicationData\Microsoft\AddressBook"directory,whereusernameistheregisteredusernameonthecomputer.Thisisyouraddressbook,andyoucanbackitupinthespecifiedCopytotheoriginaldirectoryafterreinstallingOutlookEx?pressinthefuture.

Writemailoffline

Clickthe"File"menu,select"Workoffline",theuserwillYoucanwriteyouremailscalmlywhenyouarenotonline.NewemailssentatthistimearesavedintheOutboxwindow.Onlywhenyoupressthe"SendandReceive"button,OutLookEx?presswillautomaticallyconnectTheInternetsendsletters.

Solutiontogarbledcharacters

Thebiggestannoyanceofusingemailsistoreceivegarbledemails.Thisproblemisespeciallyseriousfornovices.OutlookExpress5providesasolution.Themethodofgarbledcode:firstselectthegarbledmail,clickthe"View"menuandpointto"SimplifiedChinese(GB2312)"inthe"Encoding"command,orpointto"Others"inthe"Encoding"command.Here,"Allah"isprovided.Youcanchoosefrom19characterssuchas"Character","BalticCharacters","CentralEuropeanCharacters",etc.,youonlyneedtoclick"SimplifiedChinese(HZ)".Anothermethodis:firstselectthegarbledmailandclicktherightmousebuttontoopenthemailShortcutmenu,selectthe"Properties"command;theninthedialogboxthatappears,clickthe"Details"tab,clickthe"Mailsourcefile..."buttoninthelowerrightcorner,thenthesourcefilecodeofthemailwillbeopened,soYoucanseethecontentsoftheemail.

FamiliarwithOutlookExpress

Infact,OutlookExpresshasmorefunctionsthanthese.ItispreciselybecauseofthemanyfunctionsthatprovideuserswithgreaterconvenienceItmakesnetizensfascinatedbyit.Let’stalkaboutitfromtheinterfaceofOutlookExpress.

TheinterfaceofOutlookExpress:

TheinterfaceofOutlookExpressconsistsofamenubarandafolder.Fivemajorgroups:list,contentareaandstatusbarbecome.

Menubar:

Themenubarconsistsofsevenitems:file,edit,view,tools,mail,andhelp.

Clickingoneachitemwillbringupamenu.MostofthefunctionsofOutlookExpresscanbeimplementedhere.

Toolbar:

Generallylocatedbelowthemenubar,butthepositionsofthetwocanalsobeadjusted.Themethodistodragtheprotrudingplaceontheleftandplaceitanywhereyoulike.Thetoolbariscomposedofsomefunctionbuttons,whichareshortcutsforsomecommonlyusedfunctions.

Clickthebuttontopopupanewmaileditingwindow.Inthiswindow,justliketheaboveintroduction,fillintheaddress,subject,etc.,writesomecontent,andyoucansendit.

Thisbuttonismainlyusedtosendandreceivemail.Youcanusethisbuttonifyouwanttocheckfornewmail,orsendawrittenletter.

Itisequivalenttoanaddressbook,usedtostorecorrespondenceaddresses(thatis,emailaddresses).Wecanusetheaddressbooktostoreemailaddresses,familyandworkaddresses,telephoneandfaxnumbers,digitalIDs,meetinginformation,instantmessagingaddresses,andpersonalinformationsuchasbirthdays,anniversaries,andfamilymembers,makingOutlookExpresseasySearch.ItcanalsobeusedtofindusersandbusinesspartnersontheInternet.YoucanalsostoreInternetaddressesofindividualsandcompanies,andyoucanlinktotheseaddressesdirectlyfromtheaddressbook.Verypowerful,right?

Usedtofindinformationinmailandaddressbook.Clickingthisbuttonwillpopupthewindowshowninthefigurebelow.Enterthesearchrangeofthetimeofreceipt,andthenstartthesearch,youcangiveoutthemailthatmeetstheconditions.Inaddition,youcansearchbasedonsender,recipient,subject,attachmenttag,etc.Thisfunctionisbetterforfindingalargenumberofmails.

Folderlistandcontentarea:

Includetwoparts,maillistareaandmailpreviewarea.Theoperationmodeofthefolderlistareaandcontentareaisverysimilartothatofthewindowsexplorer.Forexample,clickontheinboxfolder,thecontentareaontherightshowsthemailintheinbox(emailisactuallyakindoffile).Clicktheselectedmessagetoreaditscontent.

StatusBar:

LocatedatthebottomoftheOutlookExpresswindow,itcandisplaytheworkingstatusofOutlookExpress.

Sendemailswithattachments:

Whatshouldyoudoifyouwanttosendafile,apicture,orasoundfiletoyourclassmates?

It'sverysimple.Ontheinterfaceofeditingnewmail,thereisaveryimportantfunctionbutton,thatis,attach.Thereisapaperclip!Weusethispapercliptoentrainsounds,picturesandotherfiles.Pleaseseethefollowingscreen:

Aftersearchingonthecomputerforalongtime,Ifoundabetterpictureeasilyandclickedtosendit.Hasthatcardreceivedyourletter?Let'scheckitout.Clicksend/receive,andtheresultwillcomeoutinawhile,

Successfulsending!

Infact,aslongasitexistsintheformofafile,itcanbesentasanattachment.Butbecareful,thefileshouldnotbetoobig.Sendasoundfiletoyourclassmatesandseehowitworks.

3.Uselogostopreventpeeking

OutlookExpressallowsyoutomanagemultipleaccounts.Iftheseaccountsarenotyours,thenyouremailsmaybeseenbyothers.Everyonehashisownlittlesecret.Inordertokeepthislittlesecret,whatshouldwedo?

Movethemousetothelogointhecontentarea,clickonceonthepop-upmenu,andchoosetoaddanewlogo.

Thefollowingscreenwillpopupatthistime:

Enterjimi.Thereisapasswordtoaskatstartup.Thisisveryimportant.Itcanensurethatyouremailwillnotbeseenbyothers.Clickthischeckbox,andapasswordinputdialogboxwillpopup.Youcanenteryoureasy-to-rememberpasswordhere.Finally,clicktheOKbutton.

Inthisway,youmustenterapasswordtoviewthemailofusermigi.AfterstartingOutlookExpress,themainlogointerfaceshouldbepresented,whichistheinterfacethateveryusercansee.Toswitchtoyouraccount,youcanselecttheswitchlogofromthelogodrop-downmenuinthecontentarea.Atthistime,theswitchlogowindowwillpopup:

Afterenteringthepassword,clicktheOKbuttontoswitchtoyouraccount.Notethattheenteredpasswordmustbecorrect.Thecomputeronlyrecognizespasswordsbutnotpeople.

Howtoremovegarbledcharactersforever

SettingupOutlookExpress5canfundamentallysolvethegarbledcharactersofemails.Themethodis:(1)OpenOutlookExpress5,Selectthe"Options"commandinthe"Tools"menu,andclickthe"Read"tab;(2)Clickthe"Font"button,select"SimplifiedChinese(GB2312)"andsetitasthedefaultvalue,andthenpress"Clickthe"OK"buttontoreturntothe"Read"dialogbox;(3)Clickthe"InternationalSettings"buttonandselect"Usethedefaultencodingforallreceivedmail"toconfirmandexit.Openalltheemailsagain,andtheChineseemailswillnotbegarbled.

Backupemails

AlthoughIE'sOutlookExpresscanexportemails,unfortunatelyitcanonlyexportemailsonebyone.Thefollowingmethodscanbeachieved.Thespecificstepsareasfollows:

(1)OpenOutlookExpressandenterthemailboxtobebackedup,suchastheinbox

(2)Selectthemailtobebackedup.Holddownthekeyandclickthefirstandlastemailstoselectall;holddowntheCtrlkeyandclickthedesiredemailstoselectmultipleemails

(3)Usetheleftmousebuttontoclick"ForwardMail".Atthispoint,theemailyoujustselectedisusedasanattachmentandisclippedintoanewemail

(4)Inthe“NewMail”dialogbox,select“SaveAs(A)…”inthe“File”menu.…"command,andthenjustgiveafilenameforthisemail.———Theabovemethodscanselectivelyexportmails.Ifyouwanttosavethemailcompletely,gototheC:\WINDOWS\ApplicationData\Microsoft\OutlookExpressMailfolderandbackupallthefiles.

Don’tuseWordasthedefaultmailEditor

Wordtakesalongtimetostart,takesupalotofmemory,andthelengthofthemailislong,whichwillinevitablyincreasethetransmissiontimeofthemail.Therefore,itisbestnottouseitasthedefaultmaileditor.

E-mailextensions

MultipurposeInternetMailExtensions

MultipurposeInternetMailExtensions(MIME,MultipurposeInternetMailExtensions)isawaytomakee-mailinadditiontoInadditiontothegeneralplaintext,theprotocolcanalsocarrybinaryfilessuchaspictures,sounds,andvideos.Ofcourse,itrequiresthatthesenderandreceiverofthemailmusthaveaprogramthatcaninterpretMIMEe-mails.

Thebasicideaof​​MIMEis:addingstructuretothemailbody,andconvertingnon-ASCIImessagesintoASCIItextthroughcertainencodingrulestoachievecorrecttransmission.CommonlyusedMIMEheaderfieldsare:MIME-VersionfieldindicatestheversionofMIME;Content-Transfer-Encodingfieldindicateshowtoencodethebodyofthemessageduringtransmission.Theencodingmethodcanbeordinary7-bitcharactersor8-bitcharacters.ItcanalsobeBase64encodingorQuoted-Printableencoding;theContent-Typefieldindicatesthetypeofmessage,suchastext/palin,image/gif,video/mpeg,etc.,slashThefrontisamajorcategory,andaftertheslashisthesub-category,therearecurrently7majorcategories,namelytext(Text),image(Image),audio(Audio),video(Video),application(Application),MessageandMultipartetc.

Base64encodingisauniversalencodingmethodwhoseprincipleistouse4bytestorepresent3bytesofdata.Forsuch4bytes,onlythefirstsixbitsareactuallyusedineachbyte,soitisnotaffectedbythelimitationthatonlysevencharacterscanbetransmitted.TheprincipleofQuoted-Printableencodingistorepresentaneight-bitcharacterwithtwohexadecimalvalues,andthenadd"="infront.Forexample,afileencodedinthiswayusuallylookslike:=B3=C2=BF=A1=C7=E5=A3=AC=C4=FA=BA=C3.

WorldWideWebE-mailService

WiththedevelopmentoftheInternet,ane-mailservicebasedonWorldWideWebbrowsinghasemerged.Thee-mailboxinthiswayonlyprovidesamoreconvenientmailreceivingandsendingservice.Thetransmissionofe-mailontheInternetstillreliesonSMTP,andthistypeofserviceusuallyalsoprovidesPOP3receivingmethods.WiththeWorldWideWebe-mailservice,usersonlyneedtouseabrowsertovisittheserviceprovider’se-mailsystemwebsite,enterausernameandpasswordontheirwebpage,andlogintotheire-mailbox,andthentheycanprocesse-mailonline.TheadvantageoftheWorldWideWebe-mailserviceisthatusersdonotneedtopreparespecialequipmentorclientsoftware,aslongastheycanbrowsetheInternet,theycanenjoymoreadvancede-mailfunctionsprovidedbye-mailserviceproviders.Forexample,customizablespamfilters,temporarymailforwardingsettings,pagerstonotifyuserswhenmailarrives,andautomaticrepliestomailwhenusersareonvacation,etc.

Securityissues

Securityknowledge

Thesecurityissuesofemailsincludetwoaspects.Oneistheinsecurefactorsthatemailsmaybringtothesystem,andtheotherisTheprivacyoftheemailcontentitself.Inthisregard,Iwouldliketosharewithyousometipsonemailsecurity.

1.Securitysettingsofthebrowser.

TakeIEasanexample.Firstofall,itisrecommendedtoupgradeIEtothelatestversion,andthenclick"Tools→InternetProperties"toenterthe"Security"tab,whereyoucancheckfourdifferentareas(Including"Internet","LocalIntranet","TrustedSites"and"RestrictedSites")forsecuritysettingsrespectively.Forthe"Internet"zone,youcansetitaccordingtoyourownsecurityconsiderationsthroughthe"CustomLevel".Althoughmostcookiesaresafeforthesystem,settingtheminthe"Privacy"tabcanproperlyprotectyourprivacy.Ifyouareworriedabouttheleakageofthecontentoftheletter,youcansetthecertificateinthe"Content"tab.

2.Turnofftheautomaticprocessingofemailaddresses.

Duetotheincreasingnumberofautomaticprocessingfunctionsinthesoftware,wewillseemoreandmoresecurityincidentscausedbyaccidentallyselectingthewrongrecipient.The"terribleauto-fillfeature"inMicrosoftOutlookisanobviousexample.Whenusingadrop-downlist,itiseasytoaccidentallyselectrecipientsclosetotheactualrecipient.Whendiscussingsensitiveinformationsuchastradesecrets,suchoperationscaneasilyleadtovarioussecurityincidents.

3.Usetheblindcopy(BCC)settingwhensendingmassmail.

Fromasecurityperspective,sharingemailaddresseswithpeoplewhodon’tneedtoknowisabadpractice.Itisalsoimpolitetoshareemailaddresseswithstrangerswithoutpermission.Whensendinganemailtomultiplepeople,youcanchoosetherecipient(TO)orcarboncopy(CC)method.Inthiscase,allrecipientscanshareallemailaddresses.Ifthereisnoclearconfirmationthattheemailaddressshouldbesharedbyallrecipients,theblindcarboncopy(BCC)settingshouldbeused.Inthiscase,therecipientwillnotknowthatthereareotherrecipients.

4.Doagoodjobafterreading.

Ifyousendandreceivelettersinpublicplaces,theprivacyofthecontentoftheletterbecomesveryimportant.Youcandeletefiles(includingallofflinecontent),clearhistory,anddeletecookiesthroughthe"General"tabof"InternetOptions".Inaddition,youcanalsogotothe"PersonalInformation"columnofthe"Content"tabtoautomaticallycompletesettings,clearformsandpasswords,etc.

Securityfactors

Securityconsiderationsincludetransmissionsecurity,storagesecurity,senderidentityconfirmation,recipientconfirmation,denialofserviceattacks,etc.Therearetwostandards:PGPandS/MIME.

1.Transmissionsecurity?

Thetransmissionprocessmaybeeavesdropped.Inordertocopewiththissituation,therearetwosolutions:

UseSSLconnection.Thecurrenttwomailreceivingprotocolsandonemailsendingprotocolbothsupportsecureserverconnections.SSLsupportisintegratedinmostpopularemailclientprograms.Afterencryptingthemail,useanormalconnectionfortransmission.Forexample,encryptionsoftwaresuchasGnuPGisusedtoencryptbeforesending,andOutlookcanalsobeused.

2,storagesecurity

Fortheencryptedmail,youcanchoosenottosavethedecryptedmail.Encryptedmailmeansthatthesenderencryptsthemailitselfbeforesending,notencryptedtransmission.Ifthemessageitselfisencrypted,thereisnoneedforencryptedtransmission.Fornon-encryptedmail(referringtothesenderdidnotencryptthemailitselfbeforesendingit,whethertouseencryptedtransmissionisanothermatter),thestoragesecurityofthemailisthesameasthestoragesecurityofotherfiles,thekeyistopreventunauthorizeduse.Ofcourse,justlikegeneralfilescanbeencrypted,thesenon-encryptedemailscanalsobeencryptedaftertheyarereceived.

3.Therecipienthasreceivedtheconfirmation

Therecipientmaydenythathe/shedidnotreceivetheemail.Inordertocopewiththissituation,differentsolutionshaveemerged,andtherehasnotbeenasetofuniversallyadoptedsolutions.MicrosoftExchangeServerofMicrosoftCorporationprovidesDeliveryReceipt.Becausethemachinesendsthe"recipienthasreceivedtheconfirmation",therecipientmaydeletethemailintentionallyorunintentionally.

4,Denialofserviceattack?

Inordertopreventauserfromusinge-mail(suchaspreventingher/himfromreceivinge-mail),denialofserviceTheattackreferstosendingalargeamountofspamtothemailboxoftheattackeduser,fillingthemailbox.Inthisway,theattackeduserwillnotbeabletoreceivethoseusefule-mails.Thissecurityconcernhasbeenresolvedtoaconsiderableextent.Oneistheincreasingnumberofmailboxes,andtheotheristhatmailserviceprovidershaveprovidedsomefilteringmeasures.Filteringmeasuressometimestreatusefulemailsasspam.Somemailserviceprovidersnowusealternatemailtopreventoutsidetrackingofmailaccounts.

Securityprecautions

Ifthewebsitecannotbeaccessednormallyduetoavirusorhackerattack,itwillundoubtedlyhaveabadinfluenceonthecompany’simage.Therefore,thefirstthingtopayattentiontoisthesecurityofthewebsitewhenlookingthroughthecorporatewebsite.Guardagainst.

1.Networkfirewall

Infact,manycompanieshavealreadyrealizedtheproblemofwebsitesecurity,butduetocostconsiderations,mostcompaniesjustusethewebsiteserverNetworkfirewallsoftwareisinstalledontheend.Althoughnetworkfirewallscanprotectagainstcommonmaliciousvirusesandnetworkattackstoacertainextent,thereisnoimpermeablewallafterall.Anynetworkfirewallsoftwareinevitablyhasitsownloopholes,plusTrojanhorsesandhackers.Therearemoreandmoresoftware,andtheupdatespeedisgettingfasterandfaster.Itisnolongerafantasytobypassthefirewallandinvadethesystem.What'smore,thenetworkfirewallsinstalledonsomewebserversarestilloutdatedandoldversions,andhavenotevenbeenupdatedforalongtime.Ifyouconsiderthenetworksecurityprotectionofthewebsiteitself,theuseofhardwarefirewallequipmentisundoubtedlythebestsolution.Afterall,moreflexibleandrichsettingfunctionscanincreasethesafetyfactorofthewebsiteserver.

2.Networksecurityarchitecture

Inordertosavecosts,somecompaniesintegratenetworksharingserver,mailserverandwebsiteserverintoonecomputer,Butneglectedtheissueofsafetyprecautionsafterbeingputintouse.Thisdoesnotmeanthattheserverlacksmailfilteringandviruspreventionmeasures,butthattherearedefectsinthenetworkarchitecture.AlthoughmostcompanieshaveconfiguredaseparateSMTPgatewayanti-virussystem,theyhavenottakenintoaccountthesecurityprecautionsforthecompany’sinternalnetwork.Forexample,thecompany’sinternalmailisnotprocessed,andmailviruseslike"cybersky"arelikelytocausethemailservertobreakdown.,Therebyaffectingthenormaloperationofthewebsiteserver.Infact,aslongasthecorrespondingconfigurationisperformedonthemailserver,allthemailsfromtheinternalIPaddressareforwardedtotheSMTPgatewayserverforfilteringprocessing,andthenthenextstepoftheforwardingchannelcanbesolved(Figure1).Undernormalcircumstances,trynottorunmultipleservicesononecomputerasmuchaspossible.Afterall,runningonemoreservicewillincreasethepotentialforfailures.Thebestwayistotrulyspecializethededicatedmachine.

3.Man-madeprevention

Inaddition,averyimportantpartofwebsitesecuritypreventionisman-madeprevention.Somecompaniesarenotequippedwithfull-timenetworkadministrators.Sincethewebsiteserverhasbeenputintooperation,fewpeoplecareaboutit,anditmaynotbemaintaineduntilweeksorevenmonths.Suchalong-termindifferenceattitudeisalsodifficulttoensurethesafetyofthewebsite.Ifahackerbreaksthefirewallandinvadesthesystemduringthisperiod,andtransplantsaTrojanhorseorvirustotheserver,itislikelytocausealargenumberofuserswhobrowsethewebsitetobeinfectedwiththevirus.,Thedirectconsequenceistoaffectthecompany’simageandreputation.What'smore,somenetworkadministratorsturnthewebserverintoapieceoftheirownnetworkworld,setupFTP,forumsorothernetworkserviceswithoutauthorization,nottomentionoccupyingsystemresources,butalsoprovidingopportunitiesforhackerstoinvadethesystem.

Disadvantagesofdomesticcorporatewebsites

Manycompanieshaveinvestedconsiderablefundstoestablishtheirownwebsites,butovertime,thesewebsitesoftenexistinnameonly.Insummary,theyarenothingmorethanthesetypes.Phenomenon:

1.Thewebsitehasnotbeenupdatedforalongtime.Somecorporatewebsiteshavenotbeenupdatedforseveralyears,andeventhecompanyhasmovedbutnothingonthewebpagehasbeenchanged.Thiscausesalotoftroubleforcustomers,andordersfalltoothercompanies.It'snotsurprisingthatinhishands.

2.Thewebsiteneverhasthecontentthatthecustomerwants.Manycustomersliketocheckandcomparethroughwebsites,butsomecorporatewebsitescanprovidetoolittleinformation.Oftentheseinformationcanonlybefoundonthird-partywebsites.Asaresult,customersoftencontactcompaniesthatprovidecompleteinformationfirst.

3.Theinformationprovidedonthewebsiteistoocomplicatedandhasnofocus.Itnotonlywastesinvestmentandoperatingcosts,butitisalsonoteasyforcustomerstofindtheinformationtheyneed.Sohowisthewebsiteofasuccessfulcompanypositioned?Accordingtothesurvey,amongthe26UScompaniesthathaveenteredtheworld’stop500companies,76.9%havesetupadedicated"productandbrand"column;38.5%ofthecompanieshavesetupan"onlineservice"columnonthehomepageoftheirwebsite,souserscanenjoyconvenienceFastonlineservice;96.2%ofcompanieshavea"ContactUs"columnonthehomepageofthewebsite.Userscandirectlycontactthecompanybyclickingonitandfeedbackvarioususerinformationtothecompany.Incontrast,domesticcompaniesthathavealsoenteredtheworld'stop500companies,75%ofthemhavesetupproductintroductioncolumns,butveryfewcanprovideonlineservicefunctions,andonlyhalfofthewebsiteshaveestablished"contactus"columns.Fromthecomparisonofthesefigures,itisnotdifficulttoseethatdomesticwebsitesdonothavetheawarenessofonlinemarketing,anddonotknowhowtousethewebsiteformarketing.Especiallytheactualeffectofthewebsiteisnotoptimistic.Thepositioningofthewebsiteisonlyaprimaryproductpromotionsite.Thereisstillaconsiderablegapintheformednetworkconsulting,networkorder,networkafter-salesandotherone-stopcompletenetworkmarketingservices.

FrequentlyAskedQuestions

1.TheTCPprotocolisusedformailtransmissionbetweenmailservers,whythemailissometimeslost?

TheSMTPprotocolbetweenthemailserversusesaTCPconnection,whichcanensurethatthemailistransferredbetweenthemailserversaccurately.However,duetothefailureofthemailserveritself,suchasinsufficientmailspace,etc.,themailcannotbetransferredandthemailwillbelost.

2.Whydoesthesenderuseragentnotdirectlysendthemailtotherecipient'suseragent,buttransmititthroughthemailserver?

Becauseofthelimitationsoftheuser’scomputerperformance,theprogramthatsendsandreceivesemailscannotberun,andcannotberununinterruptedlyandconnectedtotheInternet,sotheletterscanonlybetemporarilystoredinthemailserver,andtheusercandoitwhenneededGotodownloadtheletter.

Spam

Spamdoesnothaveaverystrictdefinition.Generallyspeaking,anyemailthatisforciblysenttotheuser'smailboxwithouttheuser'spermission.

Beforetheemergenceofspam,apersonnamedSanfordWallace(orSpamfordor"Spam")intheUnitedStatesestablishedacompanytoprovideThefee-basedadvertisingfaxservicearousesthedisgustofrecipientsandwastespaper,sotheUnitedStateslegislationprohibitsunsolicitedfaxadvertising.Later,Junfutransferredtheadvertisementtothee-mail,andthejunkmailappearednaturally.

Mailvirusreferstovirusesspreadthroughe-mail.Itisusuallyclippedintheattachmentofthemail.Aftertheuserrunsthevirusprogramintheattachment,thecomputerwillbeinfected.Itshouldbenotedthate-mailitselfdoesnotproduceviruses,butisjustaparasiticplaceforviruses.

EmailbombEmailbombisoneoftheoldestanonymousattacks.Bysettingupamachinetocontinuouslysendalargenumberofemailstothesameaddress,theattackercanexhaustthebandwidthoftherecipient'snetwork.Becausethisattackmethodissimpleandeasytouse,therearealsomanytoolsforsendinganonymousemails,andaslongastheotherpartyknowsthespecificemailaddress,theattackcanbecarriedout,sothisisthemostworthyattackmethodtoprevent.

E-mailbombscanbesaidtobeoneofthemost"popular"prankmethodsincurrentnetworksecurity,andthesespecialprogramsusedtomakepranksarealsocalledE-mailBomber.Whenapersonoracompany'sactionsarousedissatisfactionwithagooddeed,thegooddeedwillusethismethodtolaunchanoffensivetoventhispersonalanger.Thisattackmethodwillnotonlyinterferewiththenormaluseoftheuser'semailsystem,butitcanevenaffectthesecurityoftheserversystemwheretheemailsystemislocated,causingtheentirenetworksystemtobeparalyzed.Therefore,emailbombsareextremelylethal.Cyber​​weapons.

E-mailadvertisingE-mailadvertisingisaformofonlineadvertisingwithe-mailasthecarrier.E-mailadvertisingmaybealladvertisinginformation,oritmaybeinthee-mailInterspersedwithsomeusefulandrelevantinformation,itmaybeone-time,itmaybemultipleorregular.Undernormalcircumstances,anetworkuserneedstoagreetojointheemailadvertisingmailinglistinadvancetoindicatethatheagreestoacceptthistypeofadvertisinginformationbeforehecanreceiveemailadvertising.Thisisalicensingmarketingmodel.Thoseemailadvertisementsreceivedwithoutpermissionareusuallyconsideredspam.

EmailFilterEmailFilter(EmailFilter)canautomaticallyclassifythereceivedemailsaccordingtotheinformationcontainedintheemailsandputthemintothecorrespondingfolderormailboxforreadingsoftware.Forexample,allmailfromauser'suncleJoemightbeplacedinafoldernamed"UncleJoe".Filterscanalsobeusedtoblockorreceiveemailsfromspecifiedsources.

E-maildatabaseaspecialformatdatabase,includingthee-mailstoredonyourcomputer.Afterreceiving/sendingeachemail,eachreceived/sentemailissavedinthedatabase.Duringafullscanofyourcomputer,thisdatabasewillbescanned.Inthereal-timemonitoringmode,allreceivedandsentemailswillbescannedforviruses.

Preventspam

Method1:Giveyourmailboxa"goodname".Ifyourusernameistoosimpleortoocommon,itiseasytobeusedasanattacktarget.Manypeopleareaccustomedtousingthepinyinoftheirnameastheirusername,butitisgenerallytoosimpleandeasilycaughtbyspammers.Therefore,whenapplyingforanemailaddress,youmaywishtosetupamoreprotectiveusername,suchasacombinationofEnglishandnumbers,andmakeitaslongaspossibletoavoidspamharassment.

Method2:Avoidrevealingyouremailaddress.Whenbrowsingthepage,donotregisteryoure-mailaddresseverywhere,anddonoteasilytellothers.Youcanuseflexiblemethodswhenyouleavemailboxaddresseswitheachother.Youcanrewriteitasafriendtoknowataglance,andE-mailcollectionThesoftwarecan'trecognizeitandpreventitfrombeingattackedbyspam.

Method3:Don’trespondtospamcasually.Whenyoureceivespam,nomatterhowangryyouare,don'trespond.Here,"silenceisgolden",becauseonceyoureply,youtellthespammerthatyouraddressisvalid,whichwillattractmoreSpam.Thereisanothertrick.InordertoprovewhethertheE-mailaddressisvalid,manyspammersoftensayinanapologetictoneintheiremails:"Ifyoudon’tneedouremails,pleasereplyandwewillnolongersendyouemails.",ifyoureallyreply,youwillbefooledbythem.Thebestwayistoignoreitandputthesenderontherejectionlist;

Method4:Useanti-spamSpecializedsoftware.Thiskindofsoftwareisgenerallyavailableonthemarket.Forexample,theBounceSpamMailsoftwarecanbeusedtoreplytospammers,tellingthemthatthemailboxaddresssentisinvalid,soastoavoidrepeatedharassmentbyspam.AndMcAfeeSpamKillercanalsopreventspam,andatthesametimeautomaticallyreplytothespammerwitherrormessagessuchas"return"topreventthesamekindofmailfrombeingreceivedagain.

Method5:Usethemailmanagementandfilteringfunctions.OutlookExpress,Foxmailandqqmailallhaveverygoodmailmanagementfunctions.Userscanfiltermailsbysettingthemaildomain,mailsubject,source,lengthandotherrulesinthefilter.Spamemailsgenerallyhaverelativelyuniformthemes,suchas"promotion","sex",etc.Ifyoudon'twanttoreceivethistypeofemail,youcantrytosetthefilteringsubjecttocharacterscontainingthesekeywords.

Method6:Learntousetheremotemailboxmanagementfunction.Someremotemailboxmonitoringsoftwarecanchecktheremotemailboxregularlyanddisplaythesubject,sender,sizeoftheemailandotherinformation.Youcanjudgewhichareyournormalemailsandwhicharespambasedonthisinformation,soastodeletethosejunkdirectlyfromthemailbox.,Insteadofdeletingalotofemailseverytimeafterdownloadingthemtoyourlocalmailbox.

Method7:Chooseawebsitewithgoodservicetoapplyforanemailaddress.Chinadoesnothavelegislationagainstspam,nordoesitleadthedevelopmentofnewanti-spamtechnologies.ThemonitoringofspamismainlybasedonthecreditofInternetusersandthefilteringofspambyserviceproviders.Goodserviceprovidersaremorecapableofdevelopingtheirownspamfilteringsystem.

Method8:Usepaidmailboxeswithserviceguarantees.Thestabilityofpaidmailboxesisbetterthanthatoffreemailboxes.Withtheemergenceofnewandmoretechnologicallysophisticatedservices,andtheemergenceofatwo-wayauthenticationemailsysteminthefuture,spamemailswillgraduallymoveawayfrompeople'slives.