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    If you have multiple servers on a network, do you install postfix on each one

    Scheduled Pinned Locked Moved IT Discussion
    reality checklinuxpostfixbrrabill goes wild
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    • scottalanmillerS
      scottalanmiller
      last edited by

      If you have a client that implements SMTP, you are all set. But without that, postfix is needed (or something) that adds SMTP capabilities.

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

        @scottalanmiller said in If you have multiple servers on a network, do you install postfix on each one:

        If you have a client that implements SMTP, you are all set. But without that, postfix is needed (or something) that adds SMTP capabilities.

        SMTP can be sent via telnet. Nothing special is required of a system to send email.

        NerdyDadN scottalanmillerS 2 Replies Last reply Reply Quote 0
        • ObsolesceO
          Obsolesce
          last edited by

          Yeah, didn't see this thread before posting this: https://mangolassi.it/topic/15899/basic-email-sending-with-linux/9

          If your email is hosted through somewhere else, such as O365, you'll need to edit your SPF record to allow emails from that server or use an SMTP server that authenticates with and relays to O365.

          DNF-Automatic, for example, from what I've seen, does not have SMTP authentication options. So I've been using an SMTP server.

          JaredBuschJ scottalanmillerS 2 Replies Last reply Reply Quote 0
          • JaredBuschJ
            JaredBusch @Obsolesce
            last edited by

            @tim_g said in If you have multiple servers on a network, do you install postfix on each one:

            Yeah, didn't see this thread before posting this: https://mangolassi.it/topic/15899/basic-email-sending-with-linux/9

            If your email is hosted through somewhere else, such as O365, you'll need to edit your SPF record to allow emails from that server or use an SMTP server that authenticates with and relays to O365.

            DNF-Automatic, for example, from what I've seen, does not have SMTP authentication options. So I've been using an SMTP server.

            Probably because I was annoyed and typing slowly...

            1 Reply Last reply Reply Quote 0
            • wirestyle22W
              wirestyle22
              last edited by wirestyle22

              Darth Jared taking on an apprentice to accomplish his own goals, in this case being a d***

              I still am interested in hearing what you have to say about The Last Jedi though @JaredBusch

              1 Reply Last reply Reply Quote 0
              • NerdyDadN
                NerdyDad @JaredBusch
                last edited by

                @jaredbusch said in If you have multiple servers on a network, do you install postfix on each one:

                @scottalanmiller said in If you have multiple servers on a network, do you install postfix on each one:

                If you have a client that implements SMTP, you are all set. But without that, postfix is needed (or something) that adds SMTP capabilities.

                SMTP can be sent via telnet. Nothing special is required of a system to send email.

                If it can be sent via telnet, can it be sent by ssh?

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

                  @jaredbusch said in If you have multiple servers on a network, do you install postfix on each one:

                  @scottalanmiller said in If you have multiple servers on a network, do you install postfix on each one:

                  If you have a client that implements SMTP, you are all set. But without that, postfix is needed (or something) that adds SMTP capabilities.

                  SMTP can be sent via telnet. Nothing special is required of a system to send email.

                  That's not how it works. The application still has to have SMTP in the app in order to send. The mail command, the one installed by mailx, does not have SMTP in it and just drops a file locally into the MTA's processing queue.

                  https://superuser.com/questions/137461/does-mailx-send-mail-using-an-smtp-relay-or-does-it-directly-connect-to-the-targ

                  So for what @BRRABill was asking and demonstrating, yes an MTA like postfix is needed on each system. If you have a different email client than he and I were discussing that handles SMTP for you, then obviously you don't need that.

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

                    @nerdydad said in If you have multiple servers on a network, do you install postfix on each one:

                    @jaredbusch said in If you have multiple servers on a network, do you install postfix on each one:

                    @scottalanmiller said in If you have multiple servers on a network, do you install postfix on each one:

                    If you have a client that implements SMTP, you are all set. But without that, postfix is needed (or something) that adds SMTP capabilities.

                    SMTP can be sent via telnet. Nothing special is required of a system to send email.

                    If it can be sent via telnet, can it be sent by ssh?

                    This is getting really confusing. No, that's not how it works. Telnet is just a raw connection. SMTP is the protocol. Anything trying to send via it must implement the protocol. You can do HTTP over telnet, too, but that doesn't make it telnet, you still have to use HTTP.

                    1 Reply Last reply Reply Quote 2
                    • JaredBuschJ
                      JaredBusch @NerdyDad
                      last edited by

                      @nerdydad said in If you have multiple servers on a network, do you install postfix on each one:

                      @jaredbusch said in If you have multiple servers on a network, do you install postfix on each one:

                      @scottalanmiller said in If you have multiple servers on a network, do you install postfix on each one:

                      If you have a client that implements SMTP, you are all set. But without that, postfix is needed (or something) that adds SMTP capabilities.

                      SMTP can be sent via telnet. Nothing special is required of a system to send email.

                      If it can be sent via telnet, can it be sent by ssh?

                      SMTP has no encrypted connection handling, so no. The payload can be encrypted once the SMTP connection is established (STARTTLS), but SMTP has no encryption prior to that.

                      scottalanmillerS 1 Reply Last reply Reply Quote 2
                      • BRRABillB
                        BRRABill
                        last edited by

                        My root issue, I guess, if that I cannot get dnf-automatic to send e-mail to any public e-mail servers. Not Office365, for example.

                        Can I get it to send to my internal e-mail server on my internal network? Sure.

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

                          @tim_g said in If you have multiple servers on a network, do you install postfix on each one:

                          Yeah, didn't see this thread before posting this: https://mangolassi.it/topic/15899/basic-email-sending-with-linux/9

                          If your email is hosted through somewhere else, such as O365, you'll need to edit your SPF record to allow emails from that server or use an SMTP server that authenticates with and relays to O365.

                          DNF-Automatic, for example, from what I've seen, does not have SMTP authentication options. So I've been using an SMTP server.

                          SPF is optional and loads of email services either don't care or only prefer it. It's good, but it's not part of base SMTP and not required for email to be "working". Like many things, like MX, SPF, and PTR records, many services either demand them or encourage them, but they are extra, optional security checks to reduce the chance of spam and are a totally different topic - one of convincing third parties that you are not a spammer, which is not the same at all as the system level task of sending email out.

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

                            @jaredbusch said in If you have multiple servers on a network, do you install postfix on each one:

                            @nerdydad said in If you have multiple servers on a network, do you install postfix on each one:

                            @jaredbusch said in If you have multiple servers on a network, do you install postfix on each one:

                            @scottalanmiller said in If you have multiple servers on a network, do you install postfix on each one:

                            If you have a client that implements SMTP, you are all set. But without that, postfix is needed (or something) that adds SMTP capabilities.

                            SMTP can be sent via telnet. Nothing special is required of a system to send email.

                            If it can be sent via telnet, can it be sent by ssh?

                            SMTP has no encrypted connection handling, so no. The payload can be encrypted once the SMTP connection is established (STARTTLS), but SMTP has no encryption prior to that.

                            If you sent over SSH, though, it would. You actually get. Given that you used the telnet example, and use that connection methodology to say that you can send over telnet, you can actually do that over SSH, too. It's really silly, but if you are running the SMTP protocol manually then it works over SSH just like over telnet.

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

                              @scottalanmiller said in If you have multiple servers on a network, do you install postfix on each one:

                              @tim_g said in If you have multiple servers on a network, do you install postfix on each one:

                              Yeah, didn't see this thread before posting this: https://mangolassi.it/topic/15899/basic-email-sending-with-linux/9

                              If your email is hosted through somewhere else, such as O365, you'll need to edit your SPF record to allow emails from that server or use an SMTP server that authenticates with and relays to O365.

                              DNF-Automatic, for example, from what I've seen, does not have SMTP authentication options. So I've been using an SMTP server.

                              SPF is optional and loads of email services either don't care or only prefer it. It's good, but it's not part of base SMTP and not required for email to be "working". Like many things, like MX, SPF, and PTR records, many services either demand them or encourage them, but they are extra, optional security checks to reduce the chance of spam and are a totally different topic - one of convincing third parties that you are not a spammer, which is not the same at all as the system level task of sending email out.

                              While all 100% true, they are required if you want the mail your are sending with the system out to be received in today's world.

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

                                @brrabill said in If you have multiple servers on a network, do you install postfix on each one:

                                My root issue, I guess, if that I cannot get dnf-automatic to send e-mail to any public e-mail servers. Not Office365, for example.

                                Can I get it to send to my internal e-mail server on my internal network? Sure.

                                This is very different from what you asked. You asked about getting email working from the OS, and the OS does it with postfix and the standard mail command that you were trying to use depends on an MTA. Other applications may have their own SMTP individually. But that is a question about an application sending email, not about Linux or the OS sending it. Totally different concepts.

                                JaredBuschJ BRRABillB 2 Replies Last reply Reply Quote 1
                                • scottalanmillerS
                                  scottalanmiller @JaredBusch
                                  last edited by

                                  @jaredbusch said in If you have multiple servers on a network, do you install postfix on each one:

                                  @scottalanmiller said in If you have multiple servers on a network, do you install postfix on each one:

                                  @tim_g said in If you have multiple servers on a network, do you install postfix on each one:

                                  Yeah, didn't see this thread before posting this: https://mangolassi.it/topic/15899/basic-email-sending-with-linux/9

                                  If your email is hosted through somewhere else, such as O365, you'll need to edit your SPF record to allow emails from that server or use an SMTP server that authenticates with and relays to O365.

                                  DNF-Automatic, for example, from what I've seen, does not have SMTP authentication options. So I've been using an SMTP server.

                                  SPF is optional and loads of email services either don't care or only prefer it. It's good, but it's not part of base SMTP and not required for email to be "working". Like many things, like MX, SPF, and PTR records, many services either demand them or encourage them, but they are extra, optional security checks to reduce the chance of spam and are a totally different topic - one of convincing third parties that you are not a spammer, which is not the same at all as the system level task of sending email out.

                                  While all 100% true, they are required if you want the mail your are sending with the system out to be received in today's world.

                                  Most people sending emails from servers are sending to themselves, not in general. So even in the "real world", this almost never applies. I certainly don't have any use for it on my systems.

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

                                    @scottalanmiller said in If you have multiple servers on a network, do you install postfix on each one:

                                    @brrabill said in If you have multiple servers on a network, do you install postfix on each one:

                                    My root issue, I guess, if that I cannot get dnf-automatic to send e-mail to any public e-mail servers. Not Office365, for example.

                                    Can I get it to send to my internal e-mail server on my internal network? Sure.

                                    This is very different from what you asked. You asked about getting email working from the OS, and the OS does it with postfix and the standard mail command that you were trying to use depends on an MTA. Other applications may have their own SMTP individually. But that is a question about an application sending email, not about Linux or the OS sending it. Totally different concepts.

                                    I told you that oyu gave the corect answer on an incorrectly worded question.

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

                                      @scottalanmiller said

                                      This is very different from what you asked. You asked about getting email working from the OS, and the OS does it with postfix and the standard mail command that you were trying to use depends on an MTA. Other applications may have their own SMTP individually. But that is a question about an application sending email, not about Linux or the OS sending it. Totally different concepts.

                                      It is, but like everything here at ML the original question got critiqued and then spun into a new thread.

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

                                        @jaredbusch said in If you have multiple servers on a network, do you install postfix on each one:

                                        @scottalanmiller said in If you have multiple servers on a network, do you install postfix on each one:

                                        @brrabill said in If you have multiple servers on a network, do you install postfix on each one:

                                        My root issue, I guess, if that I cannot get dnf-automatic to send e-mail to any public e-mail servers. Not Office365, for example.

                                        Can I get it to send to my internal e-mail server on my internal network? Sure.

                                        This is very different from what you asked. You asked about getting email working from the OS, and the OS does it with postfix and the standard mail command that you were trying to use depends on an MTA. Other applications may have their own SMTP individually. But that is a question about an application sending email, not about Linux or the OS sending it. Totally different concepts.

                                        I told you that oyu gave the corect answer on an incorrectly worded question.

                                        Right, which I've been trying to explain to him offline. He asked you one thing privately and me a different thing. Me, he asked about the mail command and getting the OS to send.

                                        1 Reply Last reply Reply Quote 0
                                        • BRRABillB
                                          BRRABill @JaredBusch
                                          last edited by

                                          @jaredbusch said

                                          I told you that oyu gave the corect answer on an incorrectly worded question.

                                          And how was it incorrectly worded?

                                          JaredBuschJ scottalanmillerS 2 Replies Last reply Reply Quote 0
                                          • JaredBuschJ
                                            JaredBusch @BRRABill
                                            last edited by

                                            @brrabill said in If you have multiple servers on a network, do you install postfix on each one:

                                            @jaredbusch said

                                            I told you that oyu gave the corect answer on an incorrectly worded question.

                                            And how was it incorrectly worded?

                                            oh FFS

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