diff --git a/Dockerfile b/Dockerfile
index 7559220..6df4fbb 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -65,7 +65,10 @@ RUN postconf -e alias_maps='hash:/etc/postfix/aliases' \
   && postconf -e smtp_destination_rate_delay=1s \
   && postconf -e smtp_extra_recipient_limit=10 \
   && postconf -e append_dot_mydomain=yes \
-  && postconf -e masquerade_domains='$mydomain'
+  && postconf -e masquerade_domains='$mydomain' \
+  && postconf -e non_smtpd_milters=inet:opendkim:8891 \
+  && postconf -e smtpd_milters=inet:opendkim:8891
+
 RUN newaliases
 RUN postmap /etc/postfix/transport