diff --git a/docker/postfix/main.cf b/docker/postfix/main.cf
index 5a73fb3..764b62b 100644
--- a/docker/postfix/main.cf
+++ b/docker/postfix/main.cf
@@ -7,7 +7,7 @@ myhostname = __HOSTNAME__
 mydomain = __DOMAIN__
 myorigin = $mydomain
 inet_interfaces = all
-inet_protocols = ipv4
+inet_protocols = all
 
 # Recipient settings
 mydestination = localhost.$mydomain, localhost