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d66.nl

Checked 2026-10-21 21:00 UTC · first added 2026-10-21
✗Problems found Score 75 of 100

Domain & DNS

warn

27 passed 1 warn 0 failed

Areas

iRegistration iDelegation !Nameservers ✓SOA iDNSSEC ✓Records

Problems

  • !
    Software version disclosed
    Nameservers · These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: hazel.ns.cloudflare.com: "2026.10.2"; jerry.ns.cloudflare.com: "2026.10.2". Hide or replace the version string.
    #17

Recent checks

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Mail

fail

27 passed 4 warn 1 failed

Areas

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

Problems

  • ✗
    16 DNS lookups, over the limit of 10
    SPF · SPF record needs 16 DNS lookups (including nested includes), more than the limit of 10. Receivers will return a permerror; reduce includes or flatten the record.
    #2
  • !
    Single MX host, no backup
    MX · Only one MX record found. For better email reliability, consider adding at least one backup MX server.
    #12
  • !
    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
  • !
    No certificate (a=)
    BIMI · The logo is published without a Verified Mark Certificate. Gmail and Apple Mail only show BIMI logos with a VMC or CMC; Yahoo shows it without one.
    #38

Recent checks

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