Code-blue TOOLVOX X3 Bedienungsanleitung PDF herunterladen (Seite 130)

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ToolVox® X3

Administrator Guide

Thiscanstopsomepoorlydesignedbulkemailprograms.Thesecondoptionrequirestheenvelope

tottheSMTPspecicationprecisely,enforcingcompleteheaders.ThoughtheenvelopeandHELO

canbeforgedbyabulkmailer,itmaystopthemorehastilyimplementedvariants.

ThenextstageincludesthefourSMTPrestrictionsalsofoundontheSMTP Server Options page.

Theselimitfromwhereandtowheremailwillbedelivered.Theorderoftraversalforthesefourlists

ofrules:

6. Restrictions on client hostnames/addressesorsmtpd_client_restrictions

7. Restrictions on sends in HELO commandsorsmtpd_helo_restrictions

8. Restrictions on sender addressesorsmtpd_sender_restrictions

9. Restrictions on recipient addressesorsmtpd_recipient_restrictions

EachofthesecheckscanreturnREJECT,OKorDUNNO.IfREJECT,themessagewillberefused

andnofurtherruleswillbechecked.IfOK,nofurtherrulesinthegivenrestrictionwillbechecked

andthenextrestrictionlistwillbechecked.IfDUNNO,thelistwillcontinuetoprocessthecurrent

restrictionuntilitgetsanotherresult(OKorREJECT),oruntilthelistendisreached,whichisan

implicitOK.IfalllistsreturnOK,themessagewillbepassedtotheregularexpressionschecks,

otherwiseitwillberejected.

Nextaretheregularexpression-basedheader_checksandbody_checks.Theseoptions,ifenabled,

provideameanstotesttheactualcontentsoftheheadersandthebodyoftheemail,respectively.

Bothoperateinthesameway,buttheyshouldbeusedsomewhatdifferently.Headercheckscan

beusedtopreventwell-knownspammingdomainsfromsendingyouemail,orforstoppingsome

well-knownbulk-mailersoftware.Byenteringsomesignaturesoftheoffender,likethedomainname

ortheX-mailereldidentifyingthesoftware,themailcanberejectedbeforethebodyisevensent.

Bodychecks,thoughtheyusethesameregularexpressionsandleformatasheaderchecks,

shouldbeusedmoresparingly,asthemailmustbeacceptedbeforeitcanbechecked.Thus

bandwidthiswastedonreceiptofthemail,andworse,theserverwillbeoccupiedforapotentially

longtumeprocessingtheentirecontentsofeveryemail.Inshort,useheadercheckswheneverit

isconvenientandusebodychecksonlywhenaneffectiveheadercheckcannotbedevised.Only

REJECTorOKarepermittedforthereturnedvalues.

Note

 Webmin,asofthiswriting(version1.020),doesnotprovideaccesstotheregular

 expressionsbasedchecks,header_checksandbody_checks.Itislikelythatanearfuture

 versionwillsupportthesefeatures,however.

Tutorial: Setting up a basic Postﬁx mail server

Aswithmostoftheserversoftwaredocumentedhere,Postxhasanintimidatinglylargenumber

ofoptionsandfeatures.But,aswe’vealreadyseenwithBINDandApache,evencomplexsoftware

canbeeasyandquicktosetupifyouknowwhattodotogetstarted.Postxisnodifferent.Atthe

endofthisshortsection,you’llhaveafullyfunctioningmailservercapableofsendingandreceiving

mailonbehalfofoneormoredomains.

Inmostenvironments,onlythreecongurationdetailsareneededtobeginprovidingmailservice

withPostx.First,browsethetheGeneral Optionspageofthemodule.Thetoptwooptions,What

domain to use in outbound mailandWhat domains to receive mail for,needtobeconguredto

suityourenvironment.

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