Hi, I have a question about the function of the relayPort variable. I apologize for the long text ;)
I'm running a test setup using two servers, both running Debian 8.6 and Postfix. One is the 'end user' mail server (192.168.1.3), the other Postfix + ASSP (192.168.1.2). "Normally", a server on the lan that needs to be able to relay mail to the internet would be placed in acceptAllMail. By default ASSP listens on port 25 for mail from the lan to the internet (Postfix runs on port 125 on the ASSP machine). So in my end user mail server I have "relayhost = 192.168.1.2" and that works fine: if I send out a mail I see it passing through ASSP (not running as a daemon but showing everything in the console). So far so good. On my production server however I have relayPort set to 225 and my IBM Domino mailservers use *that* port to relay outgoing mail through ASSP. The production ASSP server also runs Postfix on port 225. Now as I understood it, relayPort is meant to be an extra port, sort of like security through obscurity, that allows you to relay outgoing mail on a non-standard port. The fact that this is working in my production environment corroberates that. Now, if I set relayPort to 225 in my test setup and put 192.168.1.3 (the 'end user' mail server) in allowRelayCon (it is also still in acceptAllMail) and on my mail server change relayhost to 192.168.1.2:225 (and reload or even restart Postfix) then mail is not relayed by ASSP. It leaves the mail server but it doesn't get picked up by ASSP. Restarting ASSP or rebooting the ASSP server does not change this. If I do netstat -tulpn | grep 225 on the server I can see that port 225 is not open. (Interestingly it also seems not to be open on my production ASSP machine while I'm pretty sure that *does* work.) If I change things back the mail gets delivered. Here comes the part where it gets confusing: when changing the relayPort value, a green line underneath the value box is shown reading: "relayHost () and relayPort (225) must be defined to enable relaying". Aha. relayHost, if I am not mistaken, has to do with mailservers upstream from ASSP: your isp's relay server. Suddenly we go from relaying mail internally to relaying mail to an outside server. We go from within the lan to outside. My question here is: why do I need to set up relaying to a server at my isp's (which they haven't) when I all I want to do is set up relaying from my 'end user' mail server to my ASSP box? Those have got nothing to do with each other. Thank you in advance for any enlightenment you can bring me on this subject! Have a great day :) Martin
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