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ToolVox® X3

Administrator Guide

Debugging features

Postxhastwolevelsoflogging.Therstlevelisthenormalmaillog,whichreportsonallnormal

mailactivities,suchasreceivedandsentmail,servererrors,shutdownsandstartups.Thesecond

levelismoreverboseandcanbetunedtologactivityrelatingtospecicSMTPclients,hostnames

oraddresses.Thispagecontainsthecongurationforthesecondleveloflogging.

List of domain/network patterns for which verbose log is enabled

Thisisalistofpatternsoraddressesthatmatchtheclients,hostsoraddresseswhoseactivityyou

wouldliketohavemoreverboseloggingfor.ValuescouldbeanIPaddresslike192.168.1.1or

adomainnamelikeswelltech.com.Thisoptioncorrelatestothedebug_peer_listdirectiveandis

emptybydefault.

Verbose logging level when matching the above list

Speciesthelevelofverbosityoftheloggingfortheactivitythatmatchestheabovepatterns.This

optioncorrelatestothedebug_peer_leveldirectiveanddefaultsto2.Theaboveeldmusthaveat

leastonevalueforthisdebugleveltohaveanyimpact.

Postﬁx, Unsolicited Commercial Email and Access Controls

Postxoffersanextremelyexiblesetofaccesscontrols,primarilytargetedatpreventingunsolicited

commercialemailfrombeingdeliveredthroughtheserver.Inordertoconstructasuitablesetof

controls,itisnecessarytounderstandtheorderrulesarecheckedandhowtheyinteract.Bydefault,

Postxwillacceptmailfordeliveryfromortoanyclientonyourlocalnetworkandanydomainsthat

arehostedbyPostx.So,bydefault,Postxisnotanopenrelay.Thisisagoodbeginningandall

thatisneededinmanyenvironments.However,becauseUCEissuchanuisanceforusersand

networkadministrators,itmaybeworthwhiletoimplementmoreadvancedltering.Thissectionwill

addressthebasicsofthePostxUCEcontrolfeatures.

Access Control List Order

Everymessagethatentersthesmtpddeliverydaemonwillbeprocessedbyaccesscontrollists

andcheckedagainstrulestoensurethatthemessageisonethattheadministratoractuallywants

delivered.Thegoalformostadministratorsistopreventunsolicitedcommercialemailfrompassing

throughtheserules,yetallowlegitimateemailstobedelivered.Thisisaloftygoal,andadelicate

balance.Noperfectsolutionexistsaslongaspeoplearewillingtostealresourcesfortheirown

commercialgainandgotogreatlengthstoovercometheprotectionsinplacetopreventsuch

abuse.However,inmostenvironmentsitispossibletodevelopareasonablesetofrulesthat

preventsmostspamandallowsmostoralllegitimatemailthroughunharmed.

Itisimportanttounderstandtheorderofprocessingifcomplexsetsorrulesaretobeused,as

attemptingtousearuletooearlyinthechaincanleadtosubtleerrorsorstrangemailclient

behavior.Becausenotallclientsreactcorrectlytosometypesofrefusals,andnotallclientscreate

correctlyformedSMTPrequests,itisnotunlikelythatamisplacedrulewilllockoutsomeorall

ofyourclientsfromsendinglegitimatemail.Itcouldalsoleadtoopeningaholeinyourspam

protectionsearlyintheruleset,whichwouldallowillicitmailtopass.

ThePostxUCEcontrolsbeginwithacoupleofsimpleyesornochecks,calledsmtpd_helo_

requiredandstrict_rfc821_envelopes,bothconguredintheSMTP Server Optionspage.Therst,

ifenabled,requiresaconnectingmailclienttointroduceitselffullybysendingaHELOcommand.

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