castries.fr

Delegation · all IPv4 addresses are in 46.105.230.0/24. 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.

Nameservers · These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: ns1.inexine.net: "9.9.5-3ubuntu0.19-Ubuntu"; ns2.inexine.net: "9.9.5-3-Ubuntu". 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.

SPF · SPF record needs 3 DNS lookups (limit is 10). Problems found: include:zimbra02.jvsonline.fr does not exist or has no records.

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: antispam6.xefi.fr

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

SPF · 1 include/redirect target does not exist or has no records (limit is 2). This usually is a stale include; remove it.

DMARC · These report addresses are in another domain that has not agreed to receive your reports, so receivers will not send them: mailto:supervision@xefi-montpellier.fr (needs castries.fr._report._dmarc.xefi-montpellier.fr). Ask the report provider to publish the record, or check the address.

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.