nft list table inet firewall
table inet firewall {
    chain smtp-chain {
       counter packets 1 bytes 80
    }
    chain incoming {
       type filter hook input priority 0; policy accept;
       iif "lo" accept
       ct state established,related accept
       tcp dport ssh ct state new accept
       tcp dport https ct state new accept
       tcp dport smtp ct state new jump smtp-chain
       drop
    }
}