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Add firewall rules that mitigate spam

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jaina heartles 2025-03-09 22:22:33 -04:00
parent 2c9ccff84b
commit 11afd23d99
1 changed files with 6 additions and 0 deletions
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6
postfix.nix
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@ -1,6 +1,12 @@
{ pkgs, config, ... }:
{
networking.firewall.extraCommands = let user = config.services.postfix.user;
in ''
iptables -I OUTPUT -m owner ! --uid-owner ${user} -m tcp -p tcp --dport 25 -j REJECT --reject-with icmp-admin-prohibited
ip6tables -I OUTPUT -m owner ! --uid-owner ${user} -m tcp -p tcp --dport 25 -j REJECT --reject-with icmp6-adm-prohibited
'';
services.postfix = {
enable = true;
enableSubmission = true;