Hello,
we have now set up a proxmox mail gateway at our company. Unfortunately we noticed only after the installation that apparently 2 instances of Postfix are used. Once port 25 and once port 26. The Exchange must then be converted accordingly once to port 26. Why was this done? Postfix can normally send and receive over port 25?
It works like this, no question, but why is this not solved more elegantly, if Postfix allows it? All printers and other devices in the network can then no longer send via port 25 and must be switched to port 26. Alternatively, this can be changed in the firewall or a router can be set up specifically for this purpose. Nevertheless somehow stupid, if Postfix can do that in principle also differently. Is there a plan to change this in the future?
we have now set up a proxmox mail gateway at our company. Unfortunately we noticed only after the installation that apparently 2 instances of Postfix are used. Once port 25 and once port 26. The Exchange must then be converted accordingly once to port 26. Why was this done? Postfix can normally send and receive over port 25?
It works like this, no question, but why is this not solved more elegantly, if Postfix allows it? All printers and other devices in the network can then no longer send via port 25 and must be switched to port 26. Alternatively, this can be changed in the firewall or a router can be set up specifically for this purpose. Nevertheless somehow stupid, if Postfix can do that in principle also differently. Is there a plan to change this in the future?