
Code Blue
•
259 Hedcor Street
•
Holland, MI 49423 USA
•
800.205.7186
•
www.codeblue.com GU-154-F
page 122 of 132
ToolVox® X3
Administrator Guide
optioncorrelatestothesmtpd_bannerdirectiveandcontains$myhostnameESMTP$mail_nameby
default.
Note
AproposedfederallawintheU.S.wouldmakeitillegaltosendunsolicitedcommercial
emailthroughamailserveriftheserverincludedinitsSMTPgreetingthewordsNOUCE.
Max number of recipients accepted for delivery
Thisoptionlimitsthenumberofrecipientsthatmaybespeciedinasinglemessageheader.It
isusuallyrareforlegitimatemessagestohaveanextremelylargenumberofrecipientsspecied
inasinglemessageheader,butitisoftendoneinUCEmessages.Thelegitimateexceptionis
messagestoamailinglist,possiblysentbymailinglistsoftwarelikemajordomoormailman.This
optioncorrelatestothesmtpd_recipient_limitanddefaultsto1000.
Disable SMTP VRFY command
Normally,theSMTPVRFYcommandisusedtoverifytheexistenceofaparticularuser.However,it
isalsoillegitimatelyusedbyspammerstoharvestliveemailaddresses.Thus,itissometimesuseful
todisablethiscommand.Thisoptioncorrelatestodisable_vrfy_commandanddefaultstoNo.
Timeout in seconds for SMTP transactions
ThisoptionsetsthetimeoutforaclienttorespondtotheSMTPserversresponsewithanSMTP
request.Theconnectionprocessinvolvestheclientopeningaconnectiontotheserver,theserver
replyingwithagreetingandtheclientmakingitsrequest.Iftheclientrequestdoesnotcomewithin
thetimespeciedhere,theconnectionwillbeclosed.Thisoptioncorrelatestotheopts_smtpd_
timeoutdirectiveanddefaultsto300seconds.
Timeout before sending 4xx/5xx error response
Whensendinganerrorresponsetoaclient,theserverwillsleepforaspeciedtime.Thepurpose
ofthisfeatureistopreventcertainbuggyclientsfromhittingtheserverwithrepeatedrequestsin
rapidsuccession.Thisoptioncorrelatestothesmtpd_error_sleep_timedirectiveanddefaultsto5
seconds.
Error count for temporarily ignore a client
ThisoptionconguresthenumberoferrorsthataclientmaygeneratebeforePostxwillstop
respondingtorequestsforaspeciedtime.Somebuggymailclientsmaysendalargenumberof
requests,whileignoringorrespondingincorrectlytotheerrormessagesthatresult.Postxattempts
tominimizetheimpactofthesebuggyclientsonnormalservice.Thisoptioncorrelatestothe
smtpd_soft_error_limitanddefaultsto10.
Error count for closing connection
Ifthenumberexceedsthislimit,theconnectionwillbeclosed.Thisoptioncorrelatestothesmtpd_
hard_error_limitanddefaultsto100.
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