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    Mail SMTP Relay - Reverse DNS Question

    IT Discussion
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    • brianlittlejohnB
      brianlittlejohn @Sparkum
      last edited by

      @Sparkum Are you using Artica for outbound proxy aswell? If so, it would be best to change it. If your mail server is sending directly out you can keep it at mail.domain.ca

      S 1 Reply Last reply Reply Quote 0
      • S
        Sparkum @brianlittlejohn
        last edited by

        @brianlittlejohn
        Outbound is Mandrill

        brianlittlejohnB 1 Reply Last reply Reply Quote 0
        • brianlittlejohnB
          brianlittlejohn @Sparkum
          last edited by

          @Sparkum You should be good then.

          1 Reply Last reply Reply Quote 0
          • scottalanmillerS
            scottalanmiller @Sparkum
            last edited by

            @Sparkum said:

            @scottalanmiller
            Oh really?

            So I need to contact where the virtual is hosted not where the nameserver is hosted?

            Yes, if they are the ones that interface with the ISP or are the ISP. They would be the ones. Often if you have something like AWS, Rackspace, etc. they have an interface for this.

            1 Reply Last reply Reply Quote 0
            • PSX_DefectorP
              PSX_Defector @scottalanmiller
              last edited by

              @scottalanmiller said:

              I might not have followed this correctly but... PTR (Reverse DNS) records have to be done at the IP Address point, not with your DNS provider. Whoever does your A and MX records can't be the company with the PTR record. Your ISP has to do the PTR record. The ISP at which your MX record points.

              Incorrect. It can be the same one, but someone has to have delegation to perform it.

              https://www.arin.net/resources/request/reversedns.html
              https://www.apnic.net/services/services-apnic-provides/registration-services/reverse-dns
              https://www.ripe.net/manage-ips-and-asns/db/support/configuring-reverse-dns
              http://www.lacnic.net/en/web/lacnic/guia-de-sistema-04
              https://www.afrinic.net/library/corporate-documents/216-how-to-request-reverse-delegation-in-afrinic-region

              And for the most part, most ISPs, especially home ISPs, do not delegate out permissions.

              1 Reply Last reply Reply Quote 1
              • DashrenderD
                Dashrender @scottalanmiller
                last edited by

                @scottalanmiller said:

                I might not have followed this correctly but... PTR (Reverse DNS) records have to be done at the IP Address point, not with your DNS provider. Whoever does your A and MX records can't be the company with the PTR record. Your ISP has to do the PTR record. The ISP at which your MX record points.

                You're assuming that @Sparkum is using a different DNS provider than his ISP. If he is using the ISP to provide DNS for his setup, he's already calling the right people.

                And from reading the response he received from the ISP, I'd guess they are one in the same.

                Also, as for your Reverse DNS issue, can you have more than one PTR record on an IP? If you can great, but if not, you'll be forced to get a second IP address for the Artica.

                scottalanmillerS 2 Replies Last reply Reply Quote 0
                • scottalanmillerS
                  scottalanmiller @Dashrender
                  last edited by

                  @Dashrender said:

                  You're assuming that @Sparkum is using a different DNS provider than his ISP. If he is using the ISP to provide DNS for his setup, he's already calling the right people.

                  Assuming that his DNS provider is not his VM hoster, that is correct.

                  1 Reply Last reply Reply Quote 0
                  • scottalanmillerS
                    scottalanmiller @Dashrender
                    last edited by

                    @Dashrender said:

                    Also, as for your Reverse DNS issue, can you have more than one PTR record on an IP? If you can great, but if not, you'll be forced to get a second IP address for the Artica.

                    If you had more than one PTR to an IP it would return results in round robin. Under what scenario would you want that to happen?

                    DashrenderD 1 Reply Last reply Reply Quote 0
                    • DashrenderD
                      Dashrender @scottalanmiller
                      last edited by

                      @scottalanmiller said:

                      @Dashrender said:

                      Also, as for your Reverse DNS issue, can you have more than one PTR record on an IP? If you can great, but if not, you'll be forced to get a second IP address for the Artica.

                      If you had more than one PTR to an IP it would return results in round robin. Under what scenario would you want that to happen?

                      I don't think you would - so because the OP wants to different domains here mail.domain.ca and mail-store1.domain.ca, he will be required to get a second IP to get what he wants - right?

                      scottalanmillerS 1 Reply Last reply Reply Quote 0
                      • scottalanmillerS
                        scottalanmiller @Dashrender
                        last edited by

                        @Dashrender said:

                        @scottalanmiller said:

                        @Dashrender said:

                        Also, as for your Reverse DNS issue, can you have more than one PTR record on an IP? If you can great, but if not, you'll be forced to get a second IP address for the Artica.

                        If you had more than one PTR to an IP it would return results in round robin. Under what scenario would you want that to happen?

                        I don't think you would - so because the OP wants to different domains here mail.domain.ca and mail-store1.domain.ca, he will be required to get a second IP to get what he wants - right?

                        Yes, because when you do a PTR lookup, it would not know which one to return so you'd either have to pick one or have it return at random. Not sure which is worse 🙂

                        1 Reply Last reply Reply Quote 0
                        • scottalanmillerS
                          scottalanmiller
                          last edited by

                          I easily missed something in the description, but why does he want to have two different domains at that IP address?

                          DashrenderD 1 Reply Last reply Reply Quote 0
                          • DashrenderD
                            Dashrender @scottalanmiller
                            last edited by

                            @scottalanmiller said:

                            I easily missed something in the description, but why does he want to have two different domains at that IP address?

                            Because he only has one IP from his host provider.

                            scottalanmillerS 1 Reply Last reply Reply Quote 0
                            • DashrenderD
                              Dashrender
                              last edited by

                              From what I gather, the OP has a VM server running hosted in a DC. That VM server is running both his email server and his Artica server. Both of those are behind his firewall sharing the same outgoing IP.

                              scottalanmillerS 1 Reply Last reply Reply Quote 0
                              • scottalanmillerS
                                scottalanmiller @Dashrender
                                last edited by

                                @Dashrender said:

                                @scottalanmiller said:

                                I easily missed something in the description, but why does he want to have two different domains at that IP address?

                                Because he only has one IP from his host provider.

                                Well that explains why he only has one IP. But the question was why he wants it to identify as two different domains in a PTR record.

                                DashrenderD 1 Reply Last reply Reply Quote 0
                                • scottalanmillerS
                                  scottalanmiller @Dashrender
                                  last edited by

                                  @Dashrender said:

                                  From what I gather, the OP has a VM server running hosted in a DC. That VM server is running both his email server and his Artica server. Both of those are behind his firewall sharing the same outgoing IP.

                                  And both of those solutions require a unique PTR record? Why?

                                  1 Reply Last reply Reply Quote 0
                                  • DashrenderD
                                    Dashrender @scottalanmiller
                                    last edited by Dashrender

                                    @scottalanmiller said:

                                    @Dashrender said:

                                    @scottalanmiller said:

                                    I easily missed something in the description, but why does he want to have two different domains at that IP address?

                                    Because he only has one IP from his host provider.

                                    Well that explains why he only has one IP. But the question was why he wants it to identify as two different domains in a PTR record.

                                    Because he wants a backup host to accept his email when his email server is offline.

                                    of course, this only works assuming the ISP/DC/VM host are all still running. Once any of those die, the whole box is down, and your email appears down from the outside.

                                    Oh.. and this is a learning thing.. not really production - stated in OP.

                                    scottalanmillerS 1 Reply Last reply Reply Quote 0
                                    • scottalanmillerS
                                      scottalanmiller @Dashrender
                                      last edited by

                                      @Dashrender said:

                                      Because he wants a backup host to accept his email when his email server is offline.

                                      I continue to not understand. How does this relate to the issue at hand? PTRs have nothing to do with receiving emails.

                                      DashrenderD 1 Reply Last reply Reply Quote 0
                                      • scottalanmillerS
                                        scottalanmiller
                                        last edited by

                                        PTRs are used to reduce other people seeing you as a spammer. So your PTR record needs to be set. You only need it for sending email. MX records are for receiving email.

                                        Emails coming to this IP address have already arrived once they hit the outside and the PTR record, and DNS altogether, is already past the point of being used. Receiving emails are unaffected by any PTR settings anywhere.

                                        1 Reply Last reply Reply Quote 0
                                        • DashrenderD
                                          Dashrender @scottalanmiller
                                          last edited by

                                          @scottalanmiller said:

                                          @Dashrender said:

                                          Because he wants a backup host to accept his email when his email server is offline.

                                          I continue to not understand. How does this relate to the issue at hand? PTRs have nothing to do with receiving emails.

                                          His Artica box was trying to forward email that was sitting on it to his real email server and was failing due to a rDNS failure.

                                          scottalanmillerS 1 Reply Last reply Reply Quote 0
                                          • scottalanmillerS
                                            scottalanmiller @Dashrender
                                            last edited by

                                            @Dashrender said:

                                            @scottalanmiller said:

                                            @Dashrender said:

                                            Because he wants a backup host to accept his email when his email server is offline.

                                            I continue to not understand. How does this relate to the issue at hand? PTRs have nothing to do with receiving emails.

                                            His Artica box was trying to forward email that was sitting on it to his real email server and was failing due to a rDNS failure.

                                            That's fine. So set the PTR record. All outgoing email would be the same PTR. Why would you want it to change. None of this is getting me any closer to understanding why a single PTR record doesn't do the job equally well. Outgoing email will always come from the same system, so only one PTR is needed, right? What's the function of the second PTR?

                                            DashrenderD 1 Reply Last reply Reply Quote 0
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