Code-blue TOOLVOX X3 Manuale Utente Scaricare il pdf (Pagina 110)

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page 110 of 132

ToolVox® X3

Administrator Guide

Mail system name

Thisoptionidentiesthemailserversysteminusetoconnectingusers.Itwillbeusedinthe

smtpd_banner,whichissentinReceived:headers,theSMTPgreetingbannerandinbouncedmail.

Securityexpertswhopromotesecuritythroughobscuritysuggestanonymizingallserversoftwareto

preventpotentialcrackersfromidentifyingthesoftwareontheserver.Itisprobablynotthebestuse

ofanadministrator’stimeoreffortinmostenvironments,however,andmanyothersecuritytactics

aremoreeffectiveandwon’tnegativelyimpacttheabilitytotracksoftwareproblems.Thisoption

correlatestothemail_namedirectiveanddefaultstoPostx.

Mail owner

ThisoptionspeciestheownerofthePostxmailqueueandmostofthePostxdaemonprocesses.

Thisusershouldbeuniqueonthesystemandsharenogroupswithotheraccountsorownany

otherlesorprocessesonthesystem.AfterbindingtotheSMTPport(25),Postxcandroproot

privilegesandbecometheuserspeciedhereforallnewdaemonprocesses.IfthePostxdaemon

isevercompromised,theexploiterwillonlyhaveaccesstomailandafewotherles.Obviouslyitis

goodtoavoidthisaswell,butitiscertainlybetterthanarootexploit,whichwouldallowtheexploiter

toaccessandalteranythingonthesystem.Thisoptioncorrelatestothemail_ownerdirectiveand

defaultstopostx.

Ofﬁcial mail system version

ThisparemetercongurestheversionnumberthatwillbereportedbyPostxintheSMTPgreeting

banner,amongotherthings.Thiscorrelatestothemail_versiondirectiveanddefaultstotheversion

ofPostxthatisinstalled.Onceagain,security-by-obscuritypromotersmayencourageobfuscation

ofthisvalue.

Time to wait for next service request

APostxdaemonprocesswillexitafterthetimespeciedhereifitdoesnotreceiveanewrequest

forserviceduringthattime.Thisoptioncorrespondstothemax_idledirectiveanddefaultsto100

seconds.Thisdirectivedoesnotimpactthequeuemanagerdaemonprocess.

Max service requests handled before exiting

ThisoptionconguresthemaximumnumberofrequeststhatasinglePostxdaemonprocesswill

answerbeforeexiting.Thisoptionconguresthemax_usedirectiveanddefaultsto100.

Internet hostname of this mail system

ThisoptionspeciestheInternethostnameofthemailserver.Bydefault,thisvaluewillbesetto

thefullyqualiedhostnameoftheserver,asdeterminedbyacalltogethostname().Thisoption

setsthe$myhostnamevariable,whichisusedinthedefaultstomanyotheroptions.Thisoption

correlatestothemyhostnamedirective.

Local Internet domain name

Thisoptioncorrespondstothemydomaindirectiveanddefaultstothecontentsofthe$myhostname

variableminustherstcomponent.Thisoptiondenesthe$mydomainvariableandisusedina

numberofothercongurationoptiondefaults.

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Code-blue TOOLVOX X3 Manuale Utente Pagina 110

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