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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