diff --git a/pmg-intro.adoc b/pmg-intro.adoc
index 873c9be..3b87d2d 100644
--- a/pmg-intro.adoc
+++ b/pmg-intro.adoc
@@ -180,6 +180,13 @@ summarized by an intelligent algorithm.
 - Status of final delivery
 
 
+DKIM Signing
+~~~~~~~~~~~~
+
+{pmg} offers the possibility to optionally sign outgoing emails with
+xref:pmgconfig_mailproxy_dkim[DKIM].
+
+
 High Availability with Proxmox HA Cluster
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~