diff --git a/docker/Dockerfile b/docker/Dockerfile
index 453b076..4ad4eec 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -20,6 +20,7 @@ RUN apk add shadow \
 # Config postfix
 RUN echo "policyd-spf  unix  -       n       n       -       0       spawn user=policyd-spf argv=/usr/bin/postfix-policyd-spf-perl" >> /etc/postfix/master.cf
 RUN sed -i -e 's%^#mynetworks = hash:/etc/postfix/network_table%mynetworks = /etc/opendkim/signing/TrustedHosts%' /etc/postfix/main.cf
+RUN sed -i -e 's%^inet_protocols%#&%' /etc/postfix/main.cf
 COPY include /etc/postfix/include
 COPY ssl /etc/postfix/ssl
 RUN chmod 644 /etc/postfix/ssl/ca.crts /etc/postfix/include/*cf
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]