Can port forwarding do failover to an alternative server?

[chrisisbd]

I run a postfix SMTP server on one of my home systems that manages my incoming mail. It would be very handy if the port forwarding that sends the incoming SMTP messages to the server could be configured to send them to an alternative server on my LAN if the main mail server is not available for any reason.

Is there anything in asuswrt-merlin that might be able to do this?

 

[ColinTaylor]

There is nothing built-in that does that. Although you could write your own custom script. But then your mail service becomes as reliable as your script.

 

[chrisisbd]

Yes, I realise it's not built in to a standard Asuswrt-Merlin configuration but I was wondering if anyone has done it or if there's an Entware package that provides anything like this.

By the way I should have said in my original question this is on a DSL-AC68U running 386.10_0-gnuton1.