akbw.de

Delegation · The addresses at the parent (glue) differ from the addresses in the zone: ns2.frank-und-freunde.de (glue 37.24.81.142, zone 87.128.115.107). Update the glue at your registrar.

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

Nameservers · These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: ns.frank-und-freunde.de: "9.20.29-1~deb13u1-Debian"; ns2.frank-und-freunde.de: "9.9.5-9+deb8u19-Debian". Hide or replace the version string.

SOA · refresh 10m is outside 20m–1d; expire 1d is shorter than 7d; secondaries stop answering too soon when the primary is down. Current values: refresh 10m, retry 5m, expire 1d, negative TTL 1d.

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: mf-lbn1.bisping.de, mx-m1.bisping.de, mx-l2.bisping.de

DMARC · DMARC policy only applies to 10% of failing mail (pct=10). Raise pct to 100 once you are confident in your setup.

DKIM · 1024-bit RSA keys are the minimum and are considered weak today: selector1 (1024 bits). Rotate to a 2048-bit key.

MX · The PTR name of these addresses does not resolve back to the same address: 91.99.178.218 -> wms-m1.bisping.net.

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.