celeste.fr

Delegation · The addresses at the parent (glue) differ from the addresses in the zone: ns1.celeste.fr (glue 83.142.144.247, zone 83.142.144.247, 2001:ab8:100:2::); ns3.celeste.fr (glue 83.142.144.248, zone 83.142.144.248, 2001:ab8:100:3::). Update the glue at your registrar.

Nameservers · These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: ns1.celeste.fr: "9.11.5-P4-5.1+deb10u2-Debian"; ns2.celeste.fr: "9.11.5-P4-5.1+deb10u2-Debian"; ns3.celeste.fr: "9.11.5-P4-5.1+deb10u2-Debian". Hide or replace the version string.

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.

Records · These records have a TTL below 5m, causing extra queries and slower lookups: A (1m). Low TTLs are useful just before a planned change.

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

DKIM · 1024-bit RSA keys are the minimum and are considered weak today: selector1 (1024 bits), selector2 (1024 bits). Rotate to a 2048-bit key.

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.