Set Up Docker Bridge To Work With Postfix

/etc/docker/daemon.json

{
        "experimental": true,
        "ip6tables": true,
        "ipv6": true,
        "bip": "172.16.0.1/16",
        "fixed-cidr": "172.16.0.0/16",
        "fixed-cidr-v6": "fd00::/48",
        "dns": ["134.147.32.40","134.147.222.4","2a05:3e00:1:1003::32:40","2a05:3e00:9:1001::222:4"]
}