zahnaerzte-wl.de

Delegation · all IPv4 addresses are in 212.3.65.0/24. A single network failure takes all nameservers down; RFC 2182 recommends topologically separate networks (anycast setups are an exception).

Delegation · None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.

SOA · expire 1000m is shorter than 7d; secondaries stop answering too soon when the primary is down; expire 1000m must be longer than refresh + retry. Current values: refresh 1000m, retry 5h33m20s, expire 1000m, negative TTL 1h48m20s.

DNSSEC · The zone is not signed with DNSSEC, so answers can be spoofed. Enable DNSSEC at your DNS provider and publish the DS record at your registrar.

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

DNSSEC · DNSSEC is not enabled for this domain. Consider enabling DNSSEC to protect against DNS spoofing attacks.

MX · The following MX hosts could not be resolved to IPv6 addresses: sps.zahnaerzte-wl.de, sps2.zahnaerzte-wl.de, sps1.zahnaerzte-wl.de, sps3.zahnaerzte-wl.de

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

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.