Your DKIM signature is not valid

The DNSSEC configuration on your domain registrar, New Yard Burg (via mijn.host), is incorrect:

  1. Enable DNSSEC in Cloudflare

  2. Change name servers AND update the DNSSEC material, so it matches the material provided by Cloudflare, through your registrar.

  3. Wait for the DNS propagation to succeed.

Without #1 and the part of #2, with updating the DNSSEC material, your DNS will fail on DNS resolvers that validate DNSSEC, when you change name servers, because DNSSEC will no longer match.

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