diff --git a/manifests/artemis/mailu/values.yaml b/manifests/artemis/mailu/values.yaml
index 589bfe5..f7b2ae3 100644
--- a/manifests/artemis/mailu/values.yaml
+++ b/manifests/artemis/mailu/values.yaml
@@ -1350,6 +1350,8 @@ postfix:
   ##     my_variable = my_value
   overrides:
     postfix.cf: |
+      inet_protocols = ipv4
+      smtp_address_preference = ipv4
       smtpd_helo_restrictions = reject_unknown_helo_hostname
       smtpd_sender_restrictions = reject_unknown_sender_domain
       smtpd_client_restrictions = permit_mynetworks