Are you unsure whether the email is from Punktum dk? See the guide here

How do I setup referral information in the registrar portal?

Back to all questions and answers
  1. The setup and management of the selected information can be found in the Registrar portal under the menu item 'ADMINISTRATION' > 'PUBLIC INFORMATIONS' - Click on 'EDIT".

 Et billede, der indeholder tekst, elektronik, skærmbillede, Webside Beskrivelsen er genereret automatisk

2. Mark the services that you offer:

 

3. Choose to offer domain name registration for everyone​.

Choose to participate in the Punktum dk referral program. Accept the terms. Now you can fill the registration referral information.​

Specify the URL and method that you want to use when a domain name is transferred to you. (GET or POST)​

Enter your price for a .dk domain name.​