diff --git a/content/posts/howto/protect-domain-name-without-email.md b/content/posts/howto/protect-domain-name-without-email.md
index ca0e34b..da57e0c 100644
--- a/content/posts/howto/protect-domain-name-without-email.md
+++ b/content/posts/howto/protect-domain-name-without-email.md
@@ -27,26 +27,33 @@ cover:
 #### Null MX
 Explicitly configure an 'empty' MX record according to [RFC7505](https://tools.ietf.org/html/rfc7505).
 ```
-example.com. IN MX 0 .
+@ 1800 IN MX 0 .
 ```
 
 #### SPF
 Set an an empty policy and a hard fail.
 
 ```
-example.com. IN TXT "v=spf1 –all"
+@ 1800 IN TXT "v=spf1 -all"
 ```
 
 #### DKIM
 
 ```
-*._domainkey.example.com. IN TXT "v=DKIM1; p="
+*._domainkey 1800 IN TXT "v=DKIM1; p="
 ```
 
 #### DMARC
-Set DMARC policy to reject mails, but allow reporting to take place. 
+
+Set DMARC policy to reject emails[^1]
 ```
-_dmarc.example.com. IN TXT "v=DMARC1; p=reject; rua=mailto:rua@example.com; ruf=mailto:ruf@example.com"
+_dmarc 1800 IN TXT "v=DMARC1;p=reject;sp=reject;adkim=s;aspf=s;fo=1;"
+```
+or
+
+Set DMARC policy to reject mails, but allow reporting to take place[^2] 
+```
+_dmarc 1800 IN TXT "v=DMARC1; p=reject; rua=mailto:rua@example.com; ruf=mailto:ruf@example.com"
 ```
 
 ## DNS entries for a parked domain that does not send emails
@@ -55,5 +62,6 @@ _dmarc.example.com. IN TXT "v=DMARC1; p=reject; rua=mailto:rua@example.com; ruf=
 * Don't redirect from parked domain `example.com` to the used domain `example.org`, since this encourages users to keep using the parked `example.com`. If a redirect is desirable, make sure to use the proper redirect order in order for HSTS headers to remain effective:
 	* redirect `http://example.com` to `https://example.com`
 	* when using `HTTPS`, redirect `https://example.com` to `https://example.org`.
----	
-**Credit**: akc3n’s [page of notes](https://akc3n.page/gists/#dns) and the [Dutch Internet Standards Platform](https://github.com/internetstandards/toolbox-wiki/blob/main/parked-domain-how-to.md#what-is-a-parked-domain-)
+
+[^1]: **Credit:** akc3n’s [page of notes](https://akc3n.page/gists/#dns) 
+[^2]: **Credit:** the [Dutch Internet Standards Platform](https://github.com/internetstandards/toolbox-wiki/blob/main/parked-domain-how-to.md#what-is-a-parked-domain-)