inrp.fr

Delegation · The nameservers at the parent and in the zone should be the same. Only in the zone: ccpnvx.in2p3.fr. ccpntc3.in2p3.fr, ccpnvx.in2p3.fr, dns.ens-lyon.fr, dns2.ens-lyon.fr report NS ccpntc3.in2p3.fr ccpnvx.in2p3.fr dns.ens-lyon.fr dns2.ens-lyon.fr.

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: dns.ens-lyon.fr: "9.18.49-1~deb12u2-Debian"; dns2.ens-lyon.fr: "9.18.49-1~deb12u2-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.

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

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: smtp.ens-lyon.fr

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

MX · MX records must point to a host name with A/AAAA records, not to a CNAME: smtp.ens-lyon.fr -> lxc-smtp2.ens-lyon.fr

DMARC · These report addresses are in another domain that has not agreed to receive your reports, so receivers will not send them: mailto:rua@ens-lyon.fr (needs inrp.fr._report._dmarc.ens-lyon.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.