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    Mail SMTP Relay - Reverse DNS Question

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    • S
      Sparkum
      last edited by

      Hey.

      Sorry late to the game on a couple replies here.

      Alright so.

      Yes, there is currently two IP's
      Nothing is internal, all external
      mail is on windows
      relay in on Debian

      My OVERALL point to this is to bring my mail into my house (which blocks port 25) so the relay will receive on 25 and sent to myself on 26. (dnsexit.com does but but I didnt wanna pay)

      I found where to set the reverse DNS (Truly is that easy) and I actually already had it set, just doesn't seem like its listening to it, so ya...just need to resolve this 2 second issue tonight and I should be golden.

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

        @Sparkum said:

        Hey.

        Sorry late to the game on a couple replies here.

        Alright so.

        Yes, there is currently two IP's
        Nothing is internal, all external
        mail is on windows
        relay in on Debian

        My OVERALL point to this is to bring my mail into my house (which blocks port 25) so the relay will receive on 25 and sent to myself on 26. (dnsexit.com does but but I didnt wanna pay)

        I found where to set the reverse DNS (Truly is that easy) and I actually already had it set, just doesn't seem like its listening to it, so ya...just need to resolve this 2 second issue tonight and I should be golden.

        So once the email is in your house.... you will be sending OUT through the public IP address (you should use a high port number, not 26.) Then you need the PTR record on the public IP from your ISP.

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

          @Dashrender tons of people can send from home on port 25. It's very common.

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

            @scottalanmiller I realized that once I wrote it.. and hence deleted it 🙂

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

              @scottalanmiller
              I'll send through Mandrill, just cause thats what I've always done. Always being like...slightly over a year

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

                In that case any issue would be from MailChimp, right?

                1 Reply Last reply Reply Quote 0
                • JaredBuschJ
                  JaredBusch @scottalanmiller
                  last edited by

                  @scottalanmiller said:

                  @Dashrender tons of people can send from home on port 25. It's very common.

                  Actually, no it is not. Many providers have blocked outbound port 25 for years on their residential services. AT&T implemented the block in like 2004 or 2005.

                  scottalanmillerS 1 Reply Last reply Reply Quote 0
                  • JaredBuschJ
                    JaredBusch
                    last edited by

                    @Sparkum PTR should never be a problem. If you setup an SPF record allowing your IP, assuming you have a static IP, that should handle it.

                    But if I followed all this right, the entire thing is moot as you are wanting all mail delivered to your holding service and then it will send it on to your house?

                    That should mean nothing needs to be involved with sending because the mail relay/holder should just be trusted by your local mail server and sending it directly.

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

                      @JaredBusch said:

                      @scottalanmiller said:

                      @Dashrender tons of people can send from home on port 25. It's very common.

                      Actually, no it is not. Many providers have blocked outbound port 25 for years on their residential services. AT&T implemented the block in like 2004 or 2005.

                      Many providers have blocked, but many have not. While it is not surprising to be blocked, it is not surprising at all to not be blocked.

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

                        @scottalanmiller said:

                        @JaredBusch said:

                        @scottalanmiller said:

                        @Dashrender tons of people can send from home on port 25. It's very common.

                        Actually, no it is not. Many providers have blocked outbound port 25 for years on their residential services. AT&T implemented the block in like 2004 or 2005.

                        Many providers have blocked, but many have not. While it is not surprising to be blocked, it is not surprising at all to not be blocked.

                        Only provider I can think of off the top of my head would be Frontier, on their original network. Not the ones they bought up recently, because their networks are still integrated into the rest of the original ones. And I'm not even sure on that, as I don't touch Frontier home circuits often.

                        Every cable provider from Comcast down to Mediacom block 25. AT&T and Verizon did it years ago. Hell, CenturyLink and Windstream do it. If you got an ISP that opens 25 outbound to the world, it's a very, very, very small minority.

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

                          I'm on a random cheap connection down here in Texas. Just tested here at the condo and port 25 is definitely open: Xfinity

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

                            Just tested Time Warner. They are open.

                            Frontier was open last I knew. Verizon was open last I tested. Optimum was open I am pretty sure. I've heard of people having it closed and know that crappy services like Comcast block it. But I've never to actually be blocked anywhere that I have been.

                            JaredBuschJ 1 Reply Last reply Reply Quote 0
                            • JaredBuschJ
                              JaredBusch @scottalanmiller
                              last edited by

                              @scottalanmiller said:

                              Just tested Time Warner. They are open.

                              Frontier was open last I knew. Verizon was open last I tested. Optimum was open I am pretty sure. I've heard of people having it closed and know that crappy services like Comcast block it. But I've never to actually be blocked anywhere that I have been.

                              Are you testing business or residential connections? Business connections have not been blocked generally.

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

                                Residential in all of the above cases. Either my apartment or people's homes.

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

                                  Hey.

                                  Sorry for the delay, Tis the Season eh.

                                  So ya, rDNS didnt matter on the relay, its working perfectly right now.

                                  Thanks all for the tips and tricks,

                                  Now onto my next homelab adventure!

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

                                    @Sparkum said:

                                    Hey.

                                    Sorry for the delay, Tis the Season eh.

                                    So ya, rDNS didnt matter on the relay, its working perfectly right now.

                                    Thanks all for the tips and tricks,

                                    Now onto my next homelab adventure!

                                    What fixed it then?

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

                                      @Dashrender
                                      Nothing really

                                      rDNS is still failing but the relay is working perfectly.

                                      Simply whitelisted it on the mail server to be safe (but wasnt needed) and mail is flowing perfectly.

                                      I think my random setting changes fixed it and I was simply focusing on the reverse DNS failure

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

                                        @Sparkum said:

                                        @Dashrender
                                        Nothing really

                                        rDNS is still failing but the relay is working perfectly.

                                        Simply whitelisted it on the mail server to be safe (but wasnt needed) and mail is flowing perfectly.

                                        I think my random setting changes fixed it and I was simply focusing on the reverse DNS failure

                                        Aww.. OK - thanks

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

                                          Whitelisting would definitely do it.

                                          1 Reply Last reply Reply Quote 0
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