Create parked-domain-how-to.md

parked-domain-how-to.md

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+# Introduction
+This how-to is created by the Dutch Internet Standards Platform (the organization behind [internet.nl](https://internet.nl)) and is meant to provide practical information and guidance on explicitly configuring a parked domain not to use e-mail.
+
+# Null MX
+Explicitly configure an 'empty' MX record according to [RFC7505 ](https://tools.ietf.org/html/rfc7505). 
+
+`example.nl IN MX 0 .`
+
+# DMARC
+
+`DMARC p=reject`
+
+# DKIM
+
+`selector._domainkey IN TXT "v=DKIM1; p="`
+
+# SPF
+
+`example.nl IN TXT "v=spf1 –all"`
+   
+# Other tips and tricks
+* Don't use an A or AAAA record for parked domains.
+* Don't redirect from a parked domain to the used domain, since this encourages users to keep using the parked domain name.
+  * If a redirect is used, make sure to use the proper redirect order in order for HSTS headers to remain effective: 
+    1. redirect from HTTP to HTTPS on the same (sub)domain.
+    2. when using HTTPS, redirect to another (sub)domain.