graphene-os-server-infrastr.../nftables-mail.conf

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#!/usr/bin/nft -f
flush ruleset
table inet filter {
chain prerouting-raw {
type filter hook prerouting priority raw
# drop packets without a reverse path (strict reverse path filtering)
fib saddr . iif oif missing counter drop
iif lo notrack accept
tcp dport {22, 25, 80, 443, 465, 993} notrack accept
meta l4proto {icmp, ipv6-icmp} notrack accept
}
chain output-raw {
type filter hook output priority raw
oif lo notrack accept
tcp sport {22, 25, 80, 443, 465, 993} notrack accept
meta l4proto {icmp, ipv6-icmp} notrack accept
}
chain input {
type filter hook input priority filter
policy drop
iif lo accept
tcp dport {22, 25, 80, 443, 465, 993} ip daddr {{ipv4_address}} accept
tcp dport {22, 25, 80, 443, 465, 993} ip6 daddr {{ipv6_address}} accept
meta l4proto {icmp, ipv6-icmp} accept
ct state vmap { invalid : drop, established : accept, related : accept }
meta l4proto udp reject
meta l4proto tcp reject with tcp reset
reject
}
chain forward {
type filter hook forward priority filter
policy drop
}
chain output {
type filter hook output priority filter
oif lo goto output-internal
skuid != {root, systemd-network, unbound, chrony, postfix, dovecot, dovenull, http} counter goto output-reject
}
chain output-internal {
skuid unbound meta l4proto {tcp, udp} th sport 53 th dport >= 1024 accept
skuid {chrony, postfix, opendkim, opendmarc, policyd-spf} meta l4proto {tcp, udp} th sport >= 1024 th dport 53 accept
skuid != root counter goto output-reject
accept
}
chain output-reject {
meta l4proto udp reject
meta l4proto tcp reject with tcp reset
reject
}
}