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shell.com

Checked 2026-10-22 10:41 UTC · first added 2026-10-21
!Passed with warnings Score 79 of 100

Domain & DNS

warn

31 passed 2 warn 0 failed

Areas

iRegistration !Delegation ✓Nameservers ✓SOA !DNSSEC ✓Records

Problems

  • !
    No IPv6
    Delegation · None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.
    #13
  • !
    NSEC3 with extra iterations or salt
    DNSSEC · NSEC3 uses 10 iterations and a 3-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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Full report

Domain & DNS report for shell.com ›

Mail

warn

31 passed 5 warn 0 failed

Areas

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

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: shell-com.q-v1.mx.microsoft
    #11
  • !
    Single MX host, no backup
    MX · Only one MX record found. For better email reliability, consider adding at least one backup MX server.
    #12
  • !
    Signatures expire in 86h0m0s
    DNSSEC · DNSKEY signatures expire at 2026-10-26T01:11:48Z (in 86h0m0s). Check that re-signing works.
    #21
  • !
    1024-bit DKIM key
    DKIM · 1024-bit RSA keys are the minimum and are considered weak today: s2 (1024 bits). Rotate to a 2048-bit key.
    #23

Recent checks

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