I'm seeing the following errors when a prominent North American life
insurance vendor attempts to send me email.
Oct 14 12:57:07 twinc postfix/smtpd[12194]: NOQUEUE: reject: RCPT from
unknown[216.163.249.229]: 450 4.7.1 Client host rejected: cannot find
your reverse hostname, [216.163.249.229];
from=<redac...@securemail.metlife.com> to=<redac...@redacted.net>
proto=ESMTP helo=<ms1.metlifecommercial.com>
The crux is that this host does have (an abundance of) rDNS:
[blake@twinc ~]# host 216.163.249.229
;; Truncated, retrying in TCP mode.
229.249.163.216.in-addr.arpa domain name pointer ms2.dmmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.egadbprod.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.iimetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.afimetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.arsmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.avsmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.dlmmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.dnumetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.docviewweb.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.edwmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.eesmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.epmmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.erpmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.iibmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.metlifenet.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.mmpmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.prfmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.rpgmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.stimetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.alpsmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.amnpmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.calcmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.catsmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.glifmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.ibcsmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.lifemetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.lsmsmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.massmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.ribsmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.smrsmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.statmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.tajsmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.witnessgold.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.witnessprod.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.dmassmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.emonemetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.linusmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.metlife-ihub.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.murexmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.parismetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.pmacsmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.xtivametlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.avenuemetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.bdwisemetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.caesarmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.citrixmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.grpannmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.ifecadmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.legal-lawdept.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.siebelmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.tlarsametlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.tlazawmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.charliemetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.crcsurfmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.metcommpipedev.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.paragonmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.powerimageprod.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.ermskanametlife.
229.249.163.216.in-addr.arpa domain name pointer ms2.glif-pm-metlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.intelccometlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.kamakurametlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.orangesmmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.prosightmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.securitypricing.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.startrakmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.workdeskmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.reconplusmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.tinternetmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.tlacalltrmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.bpsconsumemetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.incomeprojections.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.qeconsumermetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.qeintranetmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.sbcpricingmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.tlaannuitymetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.bpsconsumermetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.internallidmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.ltcvignettemetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.prod-erpdbametlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.remedyitsm-metlife.com.
229.249.163.216.in-addr.arpa domain name pointer
ms2.fieldpayrollmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer
ms2.metcaretngdrmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer
ms2.metcarecgprodmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer
ms2.sbrereportingmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer
ms2.metcaretngprodmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer
www.fegli04.com.249.163.216.in-addr.arpa.
229.249.163.216.in-addr.arpa domain name pointer
www.fegli04.net.249.163.216.in-addr.arpa.
229.249.163.216.in-addr.arpa domain name pointer
www.fegli04.org.249.163.216.in-addr.arpa.
229.249.163.216.in-addr.arpa domain name pointer
www.fegli2004.com.249.163.216.in-addr.arpa.
229.249.163.216.in-addr.arpa domain name pointer
www.fegli2004.net.249.163.216.in-addr.arpa.
229.249.163.216.in-addr.arpa domain name pointer
www.fegli2004.org.249.163.216.in-addr.arpa.
229.249.163.216.in-addr.arpa domain name pointer entlic.com.
229.249.163.216.in-addr.arpa domain name pointer metcss.com.
229.249.163.216.in-addr.arpa domain name pointer metmis.com.
229.249.163.216.in-addr.arpa domain name pointer ins-uis.com.
229.249.163.216.in-addr.arpa domain name pointer inv-met.com.
229.249.163.216.in-addr.arpa domain name pointer methdsystems.com.
229.249.163.216.in-addr.arpa domain name pointer ms.crcbsp.com.
229.249.163.216.in-addr.arpa domain name pointer ms.metdir.com.
229.249.163.216.in-addr.arpa domain name pointer ms.metdlm.com.
229.249.163.216.in-addr.arpa domain name pointer ms.metscc.com.
229.249.163.216.in-addr.arpa domain name pointer ms.mettpm.com.
229.249.163.216.in-addr.arpa domain name pointer ms.meticms.com.
229.249.163.216.in-addr.arpa domain name pointer ms.metrisc.com.
229.249.163.216.in-addr.arpa domain name pointer ms.wpsnefn.com.
229.249.163.216.in-addr.arpa domain name pointer ms.metemail.com.
229.249.163.216.in-addr.arpa domain name pointer ms.mao-cfeed.com.
229.249.163.216.in-addr.arpa domain name pointer ms.metdeploy.com.
229.249.163.216.in-addr.arpa domain name pointer ms.cecmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms.easmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms.efametlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms.inv-metcam.com.
229.249.163.216.in-addr.arpa domain name pointer ms.lifeadvice.com.
229.249.163.216.in-addr.arpa domain name pointer ms.metcalligo.com.
229.249.163.216.in-addr.arpa domain name pointer ms.metconnect.com.
229.249.163.216.in-addr.arpa domain name pointer ms.metibwsreg.com.
229.249.163.216.in-addr.arpa domain name pointer ms.metliferis.com.
229.249.163.216.in-addr.arpa domain name pointer ms.metlifetsm.com.
229.249.163.216.in-addr.arpa domain name pointer ms.metnotices.com.
229.249.163.216.in-addr.arpa domain name pointer ms.metproject.com.
229.249.163.216.in-addr.arpa domain name pointer ms.metpserpwf.com.
229.249.163.216.in-addr.arpa domain name pointer ms.nefannuity.com.
229.249.163.216.in-addr.arpa domain name pointer ms.nefletters.com.
229.249.163.216.in-addr.arpa domain name pointer ms.retirelink.com.
229.249.163.216.in-addr.arpa domain name pointer ms.tlcmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms.wpsmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms.comsmailing.com.
229.249.163.216.in-addr.arpa domain name pointer ms.ibppmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms.metcommpipe.com.
229.249.163.216.in-addr.arpa domain name pointer ms.meteservice.com.
229.249.163.216.in-addr.arpa domain name pointer ms.metlifebank.com.
229.249.163.216.in-addr.arpa domain name pointer ms.metlifetech.com.
229.249.163.216.in-addr.arpa domain name pointer ms.metpresents.com.
229.249.163.216.in-addr.arpa domain name pointer ms.peppmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms.enewbusiness.com.
229.249.163.216.in-addr.arpa domain name pointer ms.metfastforms.com.
229.249.163.216.in-addr.arpa domain name pointer ms.metlifee401k.com.
229.249.163.216.in-addr.arpa domain name pointer ms.metlifeleads.
229.249.163.216.in-addr.arpa domain name pointer ms.metlifeleads.com.
229.249.163.216.in-addr.arpa domain name pointer ms.metlntlnslnv.com.
229.249.163.216.in-addr.arpa domain name pointer ms.metpserpwfqa.com.
229.249.163.216.in-addr.arpa domain name pointer ms.nefnservices.com.
229.249.163.216.in-addr.arpa domain name pointer ms.reversetango.com.
229.249.163.216.in-addr.arpa domain name pointer ms.genamservices.com.
229.249.163.216.in-addr.arpa domain name pointer ms.mao-autoapply.com.
229.249.163.216.in-addr.arpa domain name pointer ms.metaproposreq.com.
229.249.163.216.in-addr.arpa domain name pointer ms.metlife-deriv.com.
229.249.163.216.in-addr.arpa domain name pointer ms.nefctsreports.com.
229.249.163.216.in-addr.arpa domain name pointer ms.wpsgenamerica.com.
229.249.163.216.in-addr.arpa domain name pointer ms.doctechmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms.fielddirectory.com.
229.249.163.216.in-addr.arpa domain name pointer ms.metlifeseclend.com.
229.249.163.216.in-addr.arpa domain name pointer ms.metlifeservice.com.
229.249.163.216.in-addr.arpa domain name pointer ms.metlifestorage.com.
229.249.163.216.in-addr.arpa domain name pointer ms.regsvcsmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms.sir2000metlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms.lifecad-metlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms.methyattnotices.com.
229.249.163.216.in-addr.arpa domain name pointer ms.metinvestmetreg.com.
229.249.163.216.in-addr.arpa domain name pointer ms.nefconnectcycle.com.
229.249.163.216.in-addr.arpa domain name pointer ms.investmetsupport.com.
229.249.163.216.in-addr.arpa domain name pointer ms.metclientsitereg.com.
229.249.163.216.in-addr.arpa domain name pointer ms.metlifehomeloans.net.
229.249.163.216.in-addr.arpa domain name pointer ms.taxdatacollection.com.
229.249.163.216.in-addr.arpa domain name pointer ms.lifeservicesmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms.lpmservices-metlife.com.
229.249.163.216.in-addr.arpa domain name pointer
ms.metlifeillustrations.com.
229.249.163.216.in-addr.arpa domain name pointer
ms.metcommercialservices.com.
229.249.163.216.in-addr.arpa domain name pointer
ms.metlifecorporateactuarial.com.
229.249.163.216.in-addr.arpa domain name pointer
ms.mao-ev15fixedannualstatements.com.
229.249.163.216.in-addr.arpa domain name pointer
ms.mao-ev15dailyfinancialconfirms.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.meteas.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.metsdo.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.metecap.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.metetad.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.ecap-dca.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.itrbrmet.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.metables.
229.249.163.216.in-addr.arpa domain name pointer ms1.metables.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.ahreports.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.efabusobj.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.fegli2004.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.metcrtsdb.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.metptgweb.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.ausmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.bcpmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.cdfmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.csametlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.efametlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.fpwmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.fwsmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.idwmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.iismetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.instmetdba.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.metcommapp.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.metlifedco.com.
229.249.163.216.in-addr.arpa domain name pointer
ms1.metlifedco.met_smartoffice.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.metlifeega.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.metliferic.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.metpaybase.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.metsadbreg.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.pasmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.securemail.metlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.srdmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.isprmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.kms-metlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.metaddisppm.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.metbusiness.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.metdatamart.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.metewintest.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.remedymlihd.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.detadmin-met.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.instmetdbaqa.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.itpm-metlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.metipmetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.metlife-itrc.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.metlifee401k.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.metlifeforms.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.metlifeschda.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.annuities1on1.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.metalarmpoint.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.metdisability.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.metinstreport.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.metlifeentkms.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.metlifeitrisk.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.bdcats-metlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.ithelp-metlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.itpm-metlifeqa.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.metclarityprod.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.meticontactreg.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.metlifeagloans.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.met_smartoffice.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.metlifeahdirect.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.metclarityreports.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.metlifecommercial.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.nbcwebsitemetlife.com.
229.249.163.216.in-addr.arpa domain name pointer ms1.dataarchivemetlife.com.
229.249.163.216.in-addr.arpa domain name pointer
ms1.metlifetechnologies.com.
229.249.163.216.in-addr.arpa domain name pointer
ms1.metlifebrokeropmetric.com.
229.249.163.216.in-addr.arpa domain name pointer
ms1.contentdistributionhub.com.
229.249.163.216.in-addr.arpa domain name pointer
ms1.metlifecoralnotification.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.fas91.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.tlait.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.ot2dba.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.udbmet.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.ctxprod.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.acts-met.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.bdproddb.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.metenlic.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.bonusprod.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.crpsysmet.com.
229.249.163.216.in-addr.arpa domain name pointer ms2.dasportal.com.
I've temproarily whitelisted the sending server. However, what to do
about the DNS issue (this isn't the first sender that I've ran into this
issue with)? Is this an error in Postfix or with my system (RHEL 5)?
--Blake
