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Postfix Documentation
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Proxy/NAT external network addresses

Some mail servers are connected to the Internet via a network address translator (NAT) or proxy. This means that systems on the Internet connect to the address of the NAT or proxy, instead of connecting to the network address of the mail server. The NAT or proxy forwards the connection to the network address of the mail server, but Postfix does not know this.

If you run a Postfix server behind a proxy or NAT, you need to configure the proxy_interfaces parameter and specify all the external proxy or NAT addresses that Postfix receives mail on. You may specify symbolic hostnames instead of network addresses.

IMPORTANT: You must specify your proxy/NAT external 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: host behind NAT box running a backup MX host.

/etc/postfix/main.cf:
    
proxy_interfaces = 1.2.3.4 (the proxy/NAT external network address)
Postfix Documentation
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