diff --git a/scripts/dns_update.sh b/scripts/dns_update.sh
index 8aa5de54..c8f99f3b 100755
--- a/scripts/dns_update.sh
+++ b/scripts/dns_update.sh
@@ -92,9 +92,16 @@ ns2        IN     A    $PUBLIC_IP
 EOF
 	fi
 
-	# If OpenDKIM is set up, append the suggested TXT record to the zone.
+	# If OpenDKIM is set up..
 	if [ -f "$STORAGE_ROOT/mail/dkim/mail.txt" ]; then
+		# Append the DKIM TXT record to the zone as generated by OpenDKIM.
 		cat "$STORAGE_ROOT/mail/dkim/mail.txt" >> /etc/nsd/zones/$fn2;
+
+		# Append ADSP (RFC 5617) and DMARC records.
+		cat >> /etc/nsd/zones/$fn2 << EOF;
+_adsp._domainkey	IN	TXT	"dkim=all"
+_dmarc			IN	TXT	"v=DMARC1; p=quarantine"
+EOF
 	fi
 	
 	# Add this zone file to the main nsd configuration file.