Introduction

This how-to is created by the Dutch Internet Standards Platform (the organization behind internet.nl) and is meant to provide practical information and guidance on explicitly configuring a parked domain not to use e-mail.

What is a parked domain?

Domain parking is the registration of an Internet domain name without that domain being associated with any services such as e-mail or a website.

Domain without e-mail

If a domain is not using e-mail it is recommended to use the following settings.

Null MX

Explicitly configure an 'empty' MX record according to RFC7505 .

example.nl IN MX 0 .

DMARC

Set DMARC policy to reject mails, but allow reporting to take place. This helps detecting activity related to your domain.

_dmarc IN TXT "v=DMARC1; p=reject; rua=mailto:rua@example.nl; ruf=mailto:ruf@example.nl

DKIM

When used with a wildcard selector, setting an empty public key indicates that all previously used keys are revoked and must be considered unreliable. The owner of a domain can also use this to explicitly signal that a domain is not configured to use e-mail. See our DKIM how-to for more information.

*._domainkey IN TXT "v=DKIM1; p="

SPF

Set an an empty policy (not mentioning any ip-adresses or hostnames which are allowed to send mail) and a hard fail.

example.nl IN TXT "v=spf1 –all"

Domain without a website

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 desirable, 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.

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