I have 2 mail server
mail1.domain.com 1.2.3.4
mail2.domain.com 1.2.3.5
I want mail2 to be proxy for mail1 and mail2 to be backup mx for mail1
Is this possible ?
I found in the postfix man the following :
proxy_interfaces (default: empty)
The network interface addresses that this mail system receives mail on by way of a proxy or network address translation unit. [...] You must specify your "outside" proxy/NAT addresses when your system is a backup MX host for other domains, otherwise mail delivery loops will happen when the primary MX host is down.
Example: proxy_interfaces = 1.2.3.4
is this the setting I must supply to mail2 main.cf ?
Or do I need to say:
proxy_interfaces = 1.2.3.5 ?
I do not catch this exactly ......
What happens when mail1 goes offline ?
second question:
how do i transport the mails from the backupmx tp the main mx when the main mx goes online again?
proxy_interfaces = 1.2.3.4
because 1.2.3.4 is the proxy
mail mail go to mail2 and you will have to fetchmail it.