I have a postfix mail server and I want to override an MX value for a particular domain.
From my understanding this is can be done by the use of transport_maps
You add a line to /etc/postfix/transport:
Generate a postmap file using:
add or edit a line in /etc/postfix/main.cf:
transport_maps = hash:/etc/postfix/transport
The question I have is when normally using MX address you normally have multiple mail servers for redundancy (in case one go's off line) How can I achieve the same thing with a transport map as it seems to point to a single ip address. Is there any way to set so that it would try multiple ip addresses in the case the first one failed.