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reverse dns problem

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  • Matteo Cazzador
    Hello everybody i receive from only one host this error from a postfix mail virtual host. Remote server refused my email and said: ........said: 421 Refused.
    Message 1 of 8 , Mar 1, 2011
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      Hello everybody i receive from only one host this error from a postfix
      mail virtual host.
      Remote server refused my email and said:

      "........said: 421 Refused. Your reverse DNS entry does not resolve. (in
      reply to RCPT TO command))"

      I made some test and this is the situation

      if i make

      C:\Users\matteo>nslookup mail.mydomain.net
      Server: UnKnown
      Address: xxxx

      Risposta da un server non autorevole:
      Nome: mail.mydomain.net
      Address: IP


      C:\Users\matteo>nslookup IP
      Server: UnKnown
      Address: xxxxxxxx

      Nome: host-IP.enter.it
      Address: IP

      My dns configuration

      - IP Record Type = ptr mail.mydomain.net
      - IP2 Record Type = ptr mailbackup.mydomain.net



      the only one thing that i note is that if i made a ping to

      host-IP.enter.it doesn't respond



      Is problem of my postfix setup or a dns isp errata configuration?

      Can someone help me please thank's


      --
      Rispetta l'ambiente: se non ti è necessario, non stampare questa mail.

      Le informazioni contenute in questa e-mail e nei files eventualmente allegati sono destinate unicamente ai destinatari della stessa e sono da considerarsi strettamente riservate. E' proibito copiare, salvare, utilizzare, inoltrare a terzi e diffondere il contenuto della presente senza il preventivo consenso, ai sensi dell'articolo 616 c.p. e della Legge n. 196/2003. Se avete ricevuto questo messaggio per errore siete pregati di comunicarlo immediatamente all'indirizzo mittente, nonché di cancellarne il contenuto senza procedere ad ulteriore o differente trattamento.


      ******************************************
      Ing. Matteo Cazzador
      NetLite snc di Cazzador Gagliardi
      Corso Vittorio Emanuele II, 188 37069
      Villafranca di Verona VR
      Tel 0454856656
      Fax 0454856655
      Email: matteo@...
      Web: http://www.netlite.it
      ******************************************
    • Matt Hayes
      ... If you could provide the IP and host name in question, I m sure we could provide some useful feedback. -Matt
      Message 2 of 8 , Mar 1, 2011
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        On 3/1/2011 9:53 AM, Matteo Cazzador wrote:
        > Hello everybody i receive from only one host this error from a postfix
        > mail virtual host.
        > Remote server refused my email and said:
        >
        > "........said: 421 Refused. Your reverse DNS entry does not resolve. (in
        > reply to RCPT TO command))"
        >
        > I made some test and this is the situation
        >
        > if i make
        >
        > C:\Users\matteo>nslookup mail.mydomain.net
        > Server: UnKnown
        > Address: xxxx
        >
        > Risposta da un server non autorevole:
        > Nome: mail.mydomain.net
        > Address: IP
        >
        >
        > C:\Users\matteo>nslookup IP
        > Server: UnKnown
        > Address: xxxxxxxx
        >
        > Nome: host-IP.enter.it
        > Address: IP
        >
        > My dns configuration
        >
        > - IP Record Type = ptr mail.mydomain.net
        > - IP2 Record Type = ptr mailbackup.mydomain.net
        >
        >
        >
        > the only one thing that i note is that if i made a ping to
        >
        > host-IP.enter.it doesn't respond
        >
        >
        >
        > Is problem of my postfix setup or a dns isp errata configuration?
        >
        > Can someone help me please thank's
        >
        >


        If you could provide the IP and host name in question, I'm sure we could
        provide some useful feedback.

        -Matt
      • Matteo Cazzador
        IP = 212.91.92.247 hostname mail.brunosrl.net Thank s ... -- Rispetta l ambiente: se non ti è necessario, non stampare questa mail. Le informazioni contenute
        Message 3 of 8 , Mar 1, 2011
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          IP = 212.91.92.247

          hostname mail.brunosrl.net

          Thank's

          Il 01/03/2011 15:55, Matt Hayes ha scritto:
          > On 3/1/2011 9:53 AM, Matteo Cazzador wrote:
          >> Hello everybody i receive from only one host this error from a postfix
          >> mail virtual host.
          >> Remote server refused my email and said:
          >>
          >> "........said: 421 Refused. Your reverse DNS entry does not resolve. (in
          >> reply to RCPT TO command))"
          >>
          >> I made some test and this is the situation
          >>
          >> if i make
          >>
          >> C:\Users\matteo>nslookup mail.mydomain.net
          >> Server: UnKnown
          >> Address: xxxx
          >>
          >> Risposta da un server non autorevole:
          >> Nome: mail.mydomain.net
          >> Address: IP
          >>
          >>
          >> C:\Users\matteo>nslookup IP
          >> Server: UnKnown
          >> Address: xxxxxxxx
          >>
          >> Nome: host-IP.enter.it
          >> Address: IP
          >>
          >> My dns configuration
          >>
          >> - IP Record Type = ptr mail.mydomain.net
          >> - IP2 Record Type = ptr mailbackup.mydomain.net
          >>
          >>
          >>
          >> the only one thing that i note is that if i made a ping to
          >>
          >> host-IP.enter.it doesn't respond
          >>
          >>
          >>
          >> Is problem of my postfix setup or a dns isp errata configuration?
          >>
          >> Can someone help me please thank's
          >>
          >>
          >
          > If you could provide the IP and host name in question, I'm sure we could
          > provide some useful feedback.
          >
          > -Matt

          --
          Rispetta l'ambiente: se non ti è necessario, non stampare questa mail.

          Le informazioni contenute in questa e-mail e nei files eventualmente allegati sono destinate unicamente ai destinatari della stessa e sono da considerarsi strettamente riservate. E' proibito copiare, salvare, utilizzare, inoltrare a terzi e diffondere il contenuto della presente senza il preventivo consenso, ai sensi dell'articolo 616 c.p. e della Legge n. 196/2003. Se avete ricevuto questo messaggio per errore siete pregati di comunicarlo immediatamente all'indirizzo mittente, nonché di cancellarne il contenuto senza procedere ad ulteriore o differente trattamento.


          ******************************************
          Ing. Matteo Cazzador
          NetLite snc di Cazzador Gagliardi
          Corso Vittorio Emanuele II, 188 37069
          Villafranca di Verona VR
          Tel 0454856656
          Fax 0454856655
          Email: matteo@...
          Web: http://www.netlite.it
          ******************************************
        • Ralf Hildebrandt
          ... $ host 212.91.92.247 247.92.91.212.in-addr.arpa domain name pointer host-247-92.91-212.enter.it. $ host host-247-92.91-212.enter.it Host
          Message 4 of 8 , Mar 1, 2011
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            * Matteo Cazzador <matteo@...>:
            >
            > IP = 212.91.92.247

            $ host 212.91.92.247
            247.92.91.212.in-addr.arpa domain name pointer host-247-92.91-212.enter.it.

            $ host host-247-92.91-212.enter.it
            Host host-247-92.91-212.enter.it not found: 3(NXDOMAIN)

            FAIL

            > hostname mail.brunosrl.net

            $ host mail.brunosrl.net
            mail.brunosrl.net has address 212.91.92.247

            $ host 212.91.92.247
            247.92.91.212.in-addr.arpa domain name pointer host-247-92.91-212.enter.it.

            mail.brunosrl.net != host-247-92.91-212.enter.it

            thus it's considered "Unknown". Solution: Make sure 212.91.92.247
            resolves to mail.brunosrl.net instead of host-247-92.91-212.enter.it

            --
            Ralf Hildebrandt
            Geschäftsbereich IT | Abteilung Netzwerk
            Charité - Universitätsmedizin Berlin
            Campus Benjamin Franklin
            Hindenburgdamm 30 | D-12203 Berlin
            Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962
            ralf.hildebrandt@... | http://www.charite.de
          • Matteo Cazzador
            Ok thank s but if my server will be a virtual mail server? with same ip to serve different domain? in this case how is possible to realize correct host IP?
            Message 5 of 8 , Mar 1, 2011
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              Ok thank's but if my server will be a virtual mail server?
              with same ip to serve different domain?
              in this case how is possible to realize correct host IP?

              Il 01/03/2011 16:06, Ralf Hildebrandt ha scritto:
              > * Matteo Cazzador<matteo@...>:
              >> IP = 212.91.92.247
              > $ host 212.91.92.247
              > 247.92.91.212.in-addr.arpa domain name pointer host-247-92.91-212.enter.it.
              >
              > $ host host-247-92.91-212.enter.it
              > Host host-247-92.91-212.enter.it not found: 3(NXDOMAIN)
              >
              > FAIL
              >
              >> hostname mail.brunosrl.net
              > $ host mail.brunosrl.net
              > mail.brunosrl.net has address 212.91.92.247
              >
              > $ host 212.91.92.247
              > 247.92.91.212.in-addr.arpa domain name pointer host-247-92.91-212.enter.it.
              >
              > mail.brunosrl.net != host-247-92.91-212.enter.it
              >
              > thus it's considered "Unknown". Solution: Make sure 212.91.92.247
              > resolves to mail.brunosrl.net instead of host-247-92.91-212.enter.it
              >

              --
              Rispetta l'ambiente: se non ti è necessario, non stampare questa mail.

              Le informazioni contenute in questa e-mail e nei files eventualmente allegati sono destinate unicamente ai destinatari della stessa e sono da considerarsi strettamente riservate. E' proibito copiare, salvare, utilizzare, inoltrare a terzi e diffondere il contenuto della presente senza il preventivo consenso, ai sensi dell'articolo 616 c.p. e della Legge n. 196/2003. Se avete ricevuto questo messaggio per errore siete pregati di comunicarlo immediatamente all'indirizzo mittente, nonché di cancellarne il contenuto senza procedere ad ulteriore o differente trattamento.


              ******************************************
              Ing. Matteo Cazzador
              NetLite snc di Cazzador Gagliardi
              Corso Vittorio Emanuele II, 188 37069
              Villafranca di Verona VR
              Tel 0454856656
              Fax 0454856655
              Email: matteo@...
              Web: http://www.netlite.it
              ******************************************
            • /dev/rob0
              [ top-posting fixed, please do not do that ] ... http://en.wikipedia.org/wiki/Forward_Confirmed_reverse_DNS Any IP should only resolve to one name. Pick one
              Message 6 of 8 , Mar 1, 2011
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                [ top-posting fixed, please do not do that ]

                On Tue, Mar 01, 2011 at 04:12:13PM +0100, Matteo Cazzador wrote:
                > Il 01/03/2011 16:06, Ralf Hildebrandt ha scritto:
                > >$ host 212.91.92.247
                > >247.92.91.212.in-addr.arpa domain name pointer host-247-92.91-212.enter.it.
                > >
                > >mail.brunosrl.net != host-247-92.91-212.enter.it
                > >
                > >thus it's considered "Unknown". Solution: Make sure 212.91.92.247
                > >resolves to mail.brunosrl.net instead of host-247-92.91-212.enter.it

                > Ok thank's but if my server will be a virtual mail server?
                > with same ip to serve different domain?
                > in this case how is possible to realize correct host IP?

                http://en.wikipedia.org/wiki/Forward_Confirmed_reverse_DNS

                Any IP should only resolve to one name.

                Pick one name that you want your server to have. Set that as its
                reverse DNS (PTR) name.

                If you want to serve different domains and have each one on unique
                hostnames, set up different instances on different IP addresses,
                where each IP address has FCrDNS as desired.

                That's ridiculous and unnecessary, but for some reason also a very
                popular idea.
                --
                Offlist mail to this address is discarded unless
                "/dev/rob0" or "not-spam" is in Subject: header
              • Driessen
                On Behalf Of Matteo Cazzador ... This is not the problem if PTR = A = HELO then you can send with thousands of virtual @Mailadresses By your server at the
                Message 7 of 8 , Mar 1, 2011
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                  On Behalf Of Matteo Cazzador
                  >
                  > Ok thank's but if my server will be a virtual mail server?
                  > with same ip to serve different domain?
                  > in this case how is possible to realize correct host IP?

                  This is not the problem
                  if PTR = A = HELO

                  then you can send with thousands of virtual @Mailadresses

                  By your server at the moment is PTR != A != helo
                  Fix it

                  >


                  Mit freundlichen Grüßen

                  Drießen

                  --
                  Software & Computer
                  Uwe Drießen
                  Lembergstraße 33
                  67824 Feilbingert
                  Tel.: +49 06708 / 660045 Fax: +49 06708 / 661397


                  Write writing
                • Ansgar Wiechers
                  ... Then that other domain should use mail.brunosrl.net as its MX. Problem solved. And please don t top-post. Regards Ansgar Wiechers -- All vulnerabilities
                  Message 8 of 8 , Mar 1, 2011
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                    On 2011-03-01 Matteo Cazzador wrote:
                    > Ok thank's but if my server will be a virtual mail server?
                    > with same ip to serve different domain?

                    Then that other domain should use mail.brunosrl.net as its MX. Problem
                    solved.

                    And please don't top-post.

                    Regards
                    Ansgar Wiechers
                    --
                    "All vulnerabilities deserve a public fear period prior to patches
                    becoming available."
                    --Jason Coombs on Bugtraq
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