diff --git a/include/01-custom.cf b/include/01-custom.cf
index 0548a52..330609c 100644
--- a/include/01-custom.cf
+++ b/include/01-custom.cf
@@ -6,7 +6,7 @@ smtpd_helo_required = yes
 recipient_delimiter = +
 disable_vrfy_command = yes
 header_checks = regexp:/etc/postfix/custom/header_checks
-#inet_protocols = ipv4, ipv6
+inet_protocols = ipv4, ipv6
 local_recipient_maps =
 mailbox_size_limit = 133169152
 qmqpd_authorized_clients = 127.0.0.1 [::1]