If you are sending email to Danish email addresses please search your lists and make sure to remove/unsubscribe all email addresses you got on the domain nej.dk. Quote from the nej.dk postmaster: “Mail addresses on the domain nej.dk are never used for newsletter subscriptions, and never will.” Sending emails to this address will hurt your deliverability. For more information about how to prevent spam traps, visit our forum.
If you got any questions regarding this matter, please send an email to support with the subject “Spam trap”.
Make sure that no one can sign up with an email adress or change their email address to one with the domain nej.dk.