diff --git a/cmdeploy/src/cmdeploy/chatmail.zone.f b/cmdeploy/src/cmdeploy/chatmail.zone.f
index d513e6668..35636348f 100644
--- a/cmdeploy/src/cmdeploy/chatmail.zone.f
+++ b/cmdeploy/src/cmdeploy/chatmail.zone.f
@@ -13,3 +13,4 @@
 www.{chatmail_domain}.               CNAME {chatmail_domain}.
 _smtp._tls.{chatmail_domain}.        TXT "v=TLSRPTv1;rua=mailto:{email}"
 {dkim_entry}
+_adsp._domainkey.{chatmail_domain}.  TXT "dkim=discardable"