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    • B
      bishnitro
      last edited by

      is there a relay that is friendly to non-linux user like me?

      J S 3 Replies Last reply Reply Quote 0
      • J
        JaredBusch @bishnitro
        last edited by JaredBusch

        @bishnitro said in Email query:

        is there a relay that is friendly to non-linux user like me?

        These are the steps to setup the server.

        1. Install CentOS 7 with a minimal configuration.
          • Do not forget to turn on networking during the GUI install process.
          • Note the MAC address and setup a static DHCP reservation in your DHCP server
        2. Install nano unless you prefer vi. I prefer nano.
        yum -y install nano
        
        1. Update all packages.
        yum -y update
        
        1. Reboot for good measure, but really should not be required.
        2. Edit the Postfix configuration file.
        nano /etc/postfix/main.cf
        
        1. Follow these instructions for the configuration of Postfix and Office 365
          • https://secopsmonkey.com/better-mail-relaying-postfix-through-office-365.html
        1 Reply Last reply Reply Quote 0
        • C
          Carnival Boy @bishnitro
          last edited by

          @bishnitro said in Email query:

          we are using office 365 and it doesn't work on it, so we are looking for alternative.

          Why doesn't it work?

          J 1 Reply Last reply Reply Quote 0
          • J
            JaredBusch @Carnival Boy
            last edited by

            @Carnival-Boy said in Email query:

            @bishnitro said in Email query:

            we are using office 365 and it doesn't work on it, so we are looking for alternative.

            Why doesn't it work?

            Their application cannot do authentication.

            1 Reply Last reply Reply Quote 0
            • J
              JaredBusch
              last edited by

              I guess you could actually just create an anonymous receive connector in Office 365 and restrict it to your public IP.

              J 1 Reply Last reply Reply Quote 0
              • C
                Carnival Boy
                last edited by

                Why do they need to authenticate to send an e-mail to someone in their organisation?

                J 1 Reply Last reply Reply Quote 0
                • C
                  coliver
                  last edited by coliver

                  Here is the Windows way of doing it. https://support.office.com/en-us/article/How-to-configure-IIS-for-relay-with-Office-365-eb57abd2-3859-4e79-b721-2ed1f0f579c9?ui=en-US&rs=en-US&ad=US

                  It is being deprecated but if you're on Server 2012R2 you still have access to it. Just make sure you restrict it so that only the localhost can send emails through it.

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                  • J
                    JaredBusch @Carnival Boy
                    last edited by

                    @Carnival-Boy said in Email query:

                    Why do they need to authenticate to send an e-mail to someone in their organisation?

                    The application is trying to connect and send SMTP. Office 365 does not allow that out of the box.

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                    • C
                      Carnival Boy
                      last edited by

                      If I want to send an e-mail to @bishnitro I can just make an SMTP connection to his server and send him an e-mail, can't I?

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

                        @bishnitro said in Email query:

                        is there a relay that is friendly to non-linux user like me?

                        Yeah, postfix is not that bad. You can also run something on Windows, but really, the Linux way isn't bad. And is a great learning experience.

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

                          @Carnival-Boy said in Email query:

                          If I want to send an e-mail to @bishnitro I can just make an SMTP connection to his server and send him an e-mail, can't I?

                          In theory, yes. But with modern security, that's never realistically possible.

                          C J 2 Replies Last reply Reply Quote 0
                          • S
                            scottalanmiller @bishnitro
                            last edited by

                            @bishnitro said in Email query:

                            is there a relay that is friendly to non-linux user like me?

                            I just built one this week. 🙂 It seems to be a popular topic at the moment.

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                            • C
                              Carnival Boy @scottalanmiller
                              last edited by

                              @scottalanmiller said in Email query:

                              But with modern security, that's never realistically possible.

                              Why not?

                              S D 2 Replies Last reply Reply Quote 0
                              • J
                                JaredBusch @scottalanmiller
                                last edited by

                                @scottalanmiller said in Email query:

                                @Carnival-Boy said in Email query:

                                If I want to send an e-mail to @bishnitro I can just make an SMTP connection to his server and send him an e-mail, can't I?

                                In theory, yes. But with modern security, that's never realistically possible.

                                It will not work. when an app tries this is will get blocked for relaying.

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                                • S
                                  scottalanmiller @Carnival Boy
                                  last edited by

                                  @Carnival-Boy said in Email query:

                                  @scottalanmiller said in Email query:

                                  But with modern security, that's never realistically possible.

                                  Why not?

                                  Lots of reasons, all around security and stopping spam, none of these are 100%, but most are like 95% true and with the overlap, it's nearly 100% that it would cause an issue:

                                  • Port 25 is not always used any longer, it's one of three main ports.
                                  • TLS is often required.
                                  • SPF records are sometimes required.
                                  • Reverse lookups almost always need to work.

                                  And more. Accepting email from "just anywhere" isn't done any longer. At a minimum most sites need to be set up as the official email system for the domain in question. Getting email to the big boys that represent most of the market (MS, Google, etc.) is even harder.

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                                  • S
                                    scottalanmiller
                                    last edited by

                                    If you don't have all of these things, then some systems will allow you to connect as an authenticated user, if you have an account on that system, which is what we are trying to do here. But the issue is that the proprietary software doesn't allow for the user to log in on the email system so that doesn't work.

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                                    • D
                                      Dashrender @Carnival Boy
                                      last edited by

                                      @Carnival-Boy said in Email query:

                                      @scottalanmiller said in Email query:

                                      But with modern security, that's never realistically possible.

                                      Why not?

                                      doing this correctly would mean that the OP would using a sending address that is on the same domain as his email domain that's hosted on O365. O365 will deny emails claiming to be coming from somewhere else for the same domain, because O365 Knows that it's responsible for that domain - it's an antispam thing.

                                      J 1 Reply Last reply Reply Quote 0
                                      • C
                                        Carnival Boy
                                        last edited by

                                        Then you could use a different domain address.

                                        S D 2 Replies Last reply Reply Quote 0
                                        • J
                                          JaredBusch @JaredBusch
                                          last edited by JaredBusch

                                          @JaredBusch said in Email query:

                                          I guess you could actually just create an anonymous receive connector in Office 365 and restrict it to your public IP.

                                          1. Sign in to Office 365
                                          2. Go to Exchange Admin
                                          3. Select Mail Flow
                                            • 0_1482252096768_upload-6aebb63d-a0e9-4c81-8f4c-1deb3f545f15
                                          4. Select Connectors.
                                            • 0_1482252124171_upload-d14b919d-2144-4b57-9ec6-571ad268c5c6
                                          5. Click the Plus
                                            • 0_1482252149531_upload-0d7d281f-76f9-42be-b9e3-51c337155a88
                                          6. These options to get past the stupidity filter
                                            • 0_1482252207166_upload-38e3f56c-f921-45b4-ad5f-8975770e0776
                                          7. Name it
                                            • 0_1482252356715_upload-e7b05e10-bc5a-4e5b-82af-8d4feddd6d12
                                          8. Click the second radio button to require an IP and click the plus.
                                            • 0_1482252465549_upload-d0473167-409d-4c7e-8de5-2d2936d6b9ab
                                          9. Enter your public subnet for the office
                                            • 0_1482252511934_upload-42a32865-5d16-4882-ab21-2c3f17d9d28a
                                          10. Click next
                                            • 0_1482252538358_upload-16fd3cb3-8b32-4802-967c-88d6697a8b44
                                          11. Verify and click save
                                            • 0_1482252572512_upload-f093b3c3-b384-45a1-a0fa-2a3751297ff4
                                          12. There you go.
                                            0_1482252606873_upload-a8540a30-d07a-4560-8029-f8ab46a1b02e
                                          13. Set said shitty app to use FQDN.mail.protection.outlook.com for the SMTP server
                                            • mine would be bundystl-com.mail.protection.outlook.com
                                          1 Reply Last reply Reply Quote 1
                                          • J
                                            JaredBusch @Dashrender
                                            last edited by

                                            @Dashrender said in Email query:

                                            @Carnival-Boy said in Email query:

                                            @scottalanmiller said in Email query:

                                            But with modern security, that's never realistically possible.

                                            Why not?

                                            doing this correctly would mean that the OP would using a sending address that is on the same domain as his email domain that's hosted on O365. O365 will deny emails claiming to be coming from somewhere else for the same domain, because O365 Knows that it's responsible for that domain - it's an antispam thing.

                                            Not if you make a connector as I just listed.

                                            D 1 Reply Last reply Reply Quote 0
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