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crous-paris.fr

Checked 2026-10-22 02:28 UTC · first added 2026-10-21
✗Problems found Score 69 of 100

Domain & DNS

warn

29 passed 2 warn 0 failed

Areas

iRegistration !Delegation ✓Nameservers ✓SOA iDNSSEC !Records

Problems

  • !
    No IPv6
    Delegation · None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.
    #13
  • !
    Very low TTLs
    Records · These records have a TTL below 5m, causing extra queries and slower lookups: MX (1s). Low TTLs are useful just before a planned change.
    #32

Recent checks

!

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Mail

fail

22 passed 5 warn 1 failed

Areas

!SPF ✗DMARC !DKIM ✓DNSSEC !MX !TLS iBIMI

Problems

  • ✗
    Policy: none (monitoring only)
    DMARC · DMARC policy is set to 'none', which only monitors but doesn't protect against spoofing. Consider upgrading to 'quarantine' or ideally 'reject'.
    #4
  • !
    8 of 10 DNS lookups, with problems
    SPF · SPF record needs 8 DNS lookups (limit is 10). Problems found: include:spf.mailing.crous-rouen.fr does not exist or has no records.
    #2
  • !
    Hosts without IPv6
    MX · The following MX hosts could not be resolved to IPv6 addresses: mx1.relay.renater.fr, mx2.relay.renater.fr
    #11
  • !
    1024-bit DKIM key
    DKIM · 1024-bit RSA keys are the minimum and are considered weak today: selector1 (1024 bits). Rotate to a 2048-bit key.
    #23
  • !
    1 void lookup
    SPF · 1 include/redirect target does not exist or has no records (limit is 2). This usually is a stale include; remove it.
    #26
  • !
    Not configured
    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.
    #32

Recent checks

✗

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