Postfix relays a few domains to a fixed IP address, or its failover address.
1.2.3.4 and 11.12.13.14 (failover)
These two IP addresses are where the relay should occur.
Currently, transport_map
exemple1.com relay:[1.2.3.4]:587
exemple2.com relay:[1.2.3.4]:587
Is there a way, in case [1.2.3.4] times out, to use the failover automatically, like
exemple1.com relay:[1.2.3.4]:587
exemple2.com relay:[1.2.3.4]:587
exemple1.com relay:[11.12.13.14]:587
exemple2.com relay:[11.12.13.14]:587
Would that work?
(There is this question which is a tad different. Adding multiple IPs to /etc/hosts (or DNS if that was possible) would use either IP. In my case the failover should only be used if the main one times out)