I have 1 public IP address from my ISP and I want to host my own mail server.
However, there are times when I need to perform maintenance or upgrades that will cause that mail server to have downtime. My idea was to create a secondary mail server that can act as a temporary host while maintenance is being performed. To do this, I would simply tell USG to forward the ports to the secondary mail server IP. Is there anyway I can automate the changing of IP's for port forwarding?
This would be useful if the mail service went down unexpectedly and I wasn't available to manually change it.
I know this method isn't ideal, however, this is for personal/home use. The mail isn't critical, but I would like to avoid losing as much mail as possible.
Until Ubiquiti makes the USG support multiple WANs, I'm stuck with this route or paying more for external hosted email.
