diff --git a/templates/main.cf.j2 b/templates/main.cf.j2
index 949f24a..024930a 100644
--- a/templates/main.cf.j2
+++ b/templates/main.cf.j2
@@ -65,3 +65,15 @@ smtpd_sender_restrictions = reject_unknown_sender_domain
 dovecot_destination_recipient_limit = 1
 virtual_transport = dovecot
 {% endif %}
+
+# opendkim
+
+{% if postfix.enable_opendkim|d(false) %}
+
+milter_protocol = 6
+milter_default_action = accept
+
+smtpd_milters = inet:localhost:8891
+non_smtpd_milters = inet:localhost:8891
+
+{% endif %}