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six-group.com

Checked 2026-10-22 10:43 UTC · first added 2026-10-21
✗Problems found Score 65 of 100

Domain & DNS

warn

30 passed 2 warn 0 failed

Areas

iRegistration iDelegation !Nameservers ✓SOA !DNSSEC ✓Records

Problems

  • !
    Software version disclosed
    Nameservers · These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: a1-232.akam.net: "41824.5"; a1-232.akam.net: "41824.11"; a18-67.akam.net: "48878.30"; a18-67.akam.net: "48878.31"; a20-65.akam.net: "48878.33"; a20-65.akam.net: "48878.31"; a24-67.akam.net: "48878.32"; a24-67.akam.net: "48878.31"; a5-66.akam.net: "41824.10"; a5-66.akam.net: "41824.5". Hide or replace the version string.
    #17
  • !
    NSEC3 with extra iterations or salt
    DNSSEC · NSEC3 uses 10 iterations and a 14-byte salt. RFC 9276 recommends 0 iterations and no salt: extra iterations cost resolvers CPU and add no real protection, and some validators treat high counts as insecure.
    #31

Recent checks

!

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Mail

fail

27 passed 3 warn 2 failed

Areas

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

Problems

  • ✗
    Policy not reachable
    TLS · The MTA-STS record exists but the policy could not be fetched, so senders ignore MTA-STS: https://mta-sts.six-group.com/.well-known/mta-sts.txt returned HTTP 421.
    #33
  • ✗
    Invalid TLS-RPT record
    TLS · Senders ignore the TLS-RPT record because of: report URI "tlsrpt@six-group.com" must be mailto: or https:.
    #35
  • !
    Hosts without IPv6
    MX · The following MX hosts could not be resolved to IPv6 addresses: mail10.six-group.com, mail5.six-group.com, mail6.six-group.com, mail9.six-group.com, mail11.six-group.com, mail12.six-group.com, mail7.six-group.com, mail8.six-group.com
    #11
  • !
    More than 5 MX records
    MX · Found 8 MX records, which is more than the recommended maximum of 5. Too many MX records may indicate a misconfiguration.
    #13
  • !
    Signatures expire in 84h0m0s
    DNSSEC · DNSKEY signatures expire at 2026-10-25T22:15:52Z (in 84h0m0s). Check that re-signing works.
    #21

Recent checks

✗

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