diff --git a/nixos/boxes/colony/vms/estuary/dns.nix b/nixos/boxes/colony/vms/estuary/dns.nix
index 591a1f8..f53a9d5 100644
--- a/nixos/boxes/colony/vms/estuary/dns.nix
+++ b/nixos/boxes/colony/vms/estuary/dns.nix
@@ -264,6 +264,8 @@ in
             @ IN NS ns.${config.networking.domain}.
             @ IN NS ns1.he.net.
 
+            1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2 IN PTR mail.nul.ie.
+
             ${intPtr6Records}
 
             * ${wildcardPtr6Def}