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teamtreehouse.com

Checked 2026-10-22 10:55 UTC · first added 2026-10-21
✗Problems found Score 72 of 100

Domain & DNS

warn

29 passed 2 warn 0 failed

Areas

iRegistration iDelegation ✓Nameservers ✓SOA !DNSSEC !Records

Problems

  • !
    Signed but not delegated securely
    DNSSEC · The zone is signed but the parent has no DS record, so the signatures are not used. Publish the DS record at your registrar.
    #27
  • !
    Very low TTLs
    Records · These records have a TTL below 5m, causing extra queries and slower lookups: A (1m). Low TTLs are useful just before a planned change.
    #32

Recent checks

!

Full report

Domain & DNS report for teamtreehouse.com ›

Mail

fail

25 passed 4 warn 1 failed

Areas

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

Problems

  • ✗
    11 DNS lookups, over the limit of 10
    SPF · SPF record needs 11 DNS lookups (including nested includes), more than the limit of 10. Receivers will return a permerror; reduce includes or flatten the record.
    #2
  • !
    Signed, but no DS at parent
    DNSSEC · The zone is signed (DNSKEY present) but the parent has no DS record, so the chain of trust is incomplete. Publish the DS record at your registrar.
    #8
  • !
    Signatures expire in 7h0m0s
    DNSSEC · DNSKEY signatures expire at 2026-10-22T18:00:00Z (in 7h0m0s). Check that re-signing works.
    #21
  • !
    1024-bit DKIM key
    DKIM · 1024-bit RSA keys are the minimum and are considered weak today: k1 (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

✗

Full report

Mail report for teamtreehouse.com ›