diff --git a/modoboa_installer/scripts/files/postfix/main.cf.tpl b/modoboa_installer/scripts/files/postfix/main.cf.tpl
index 6b83357..7af5487 100644
--- a/modoboa_installer/scripts/files/postfix/main.cf.tpl
+++ b/modoboa_installer/scripts/files/postfix/main.cf.tpl
@@ -1,5 +1,5 @@
 inet_interfaces = all
-inet_protocols = ipv4
+inet_protocols = all
 myhostname = %hostname
 myorigin = $myhostname
 mydestination = $myhostname