My PostConf server is behind a NAT (network address translation)
firewall. How do I configure it to send and accept mail?
You don't normally have to do anything for
PostConf/Postfix to work behind a NAT firewall
as long as the firewall rules map the external
IP to the server's internal IP address.
If your firewall does not translate both internal
and external addresses, define "proxy_interfaces" in
/usr/postconf/main.cf.local (from the command
line) per the documentation at
/etc/postfix/docs/BASIC_CONFIGURATION_README.
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