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cst.fr

Checked 2026-10-22 02:28 UTC · first added 2026-10-21
!Passed with warnings Score 85 of 100

Domain & DNS

warn

28 passed 1 warn 0 failed

Areas

iRegistration iDelegation ✓Nameservers !SOA ✓DNSSEC iRecords

Problems

  • !
    Serial date in the future
    SOA · The serial 2092071248 looks like a date (YYYYMMDDnn) in the future (2092-07-12). It can only grow, so a wrong date can't be undone without a serial wrap-around.
    #26

Recent checks

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Full report

Domain & DNS report for cst.fr ›

Mail

warn

26 passed 4 warn 0 failed

Areas

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

Problems

  • !
    Policy: quarantine
    DMARC · DMARC policy is set to 'quarantine'. Consider upgrading to 'reject' for stronger protection once you've verified legitimate emails are passing authentication.
    #4
  • !
    Hosts without IPv6
    MX · The following MX hosts could not be resolved to IPv6 addresses: mx3.ovh.net, mx4.ovh.net, mxb.ovh.net
    #11
  • !
    1024-bit DKIM key
    DKIM · 1024-bit RSA keys are the minimum and are considered weak today: default (1024 bits). Rotate to a 2048-bit key.
    #23
  • !
    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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Mail report for cst.fr ›