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 and allow at
    least tcp port 25 (smtp).

    If your firewall does not translate both internal and external
    addresses you may need to define "proxy_interfaces" in
    /usr/postconf/main.cf.local (per the BASIC_CONFIGURATION_README)
    before triggering the [Admin]/[Server]/[Reload_All] menu option.

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