diff --git a/ansible/roles/k8s_network/files/cluster.balsillie.house/calico_ip_reservation.yaml b/ansible/roles/k8s_network/files/cluster.balsillie.house/calico_ip_reservation.yaml
index 33e9c9d..e4ad7c9 100644
--- a/ansible/roles/k8s_network/files/cluster.balsillie.house/calico_ip_reservation.yaml
+++ b/ansible/roles/k8s_network/files/cluster.balsillie.house/calico_ip_reservation.yaml
@@ -19,6 +19,14 @@ spec:
 #
 # Mail:
 #
+#   Postfix:
+#     10.208.240.3
+#     2400:8907:e002:7c10:ffff:ffff:ffff:f003
+#
+#   Dovecot:
+#     10.208.240.4
+#     2400:8907:e002:7c10:ffff:ffff:ffff:f004
+#
 # Matrix:
 #
 # Turn: