kinderboekenweek.nl

Delegation · The nameservers at the parent and in the zone should be the same. Only at the parent: nsauth1.ixlhosting.nl, nsauth2.ixlhosting.nl, nsauth3.ixl.nu; only in the zone: ns1.whih.nl, ns2.whih.nl. ns1.whih.nl, ns2.whih.nl, nsauth1.ixlhosting.nl, nsauth2.ixlhosting.nl, nsauth3.ixl.nu report NS ns1.whih.nl ns2.whih.nl.

DNSSEC · NSEC3 uses 1 iteration and a 2-byte salt. RFC 9276 recommends 0 iterations and no salt: extra iterations cost resolvers CPU and add no real protection, and some validators treat high counts as insecure.

DMARC · DMARC policy is set to 'quarantine'. Consider upgrading to 'reject' for stronger protection once you've verified legitimate emails are passing authentication.

DKIM · The _domainkey name exists but no DKIM key was found under the common selectors. Selectors are provider-specific; check yours with -selector.

MX · Only one MX record found. For better email reliability, consider adding at least one backup MX server.

DMARC · DMARC record has no rua tag, so you receive no aggregate reports about who sends mail as your domain. Add rua=mailto:...

DMARC · DMARC subdomain policy is sp=none, so spoofed mail from subdomains is not blocked. Consider sp=quarantine or sp=reject.

TLS · MTA-STS is not configured, so other mail servers fall back to unencrypted delivery when TLS fails or is stripped by an attacker. Publish a _mta-sts TXT record and a policy at https://mta-sts.<domain>/.well-known/mta-sts.txt.