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simonlevelt.nl

Checked 2026-10-22 15:51 UTC · first added 2026-10-21
!Check could not complete

Domain & DNS

error

25 passed 1 warn 1 failed 1 errors

lookups failed for rdap; results are incomplete

Areas

iRegistration iDelegation ✗Nameservers ✓SOA !DNSSEC iRecords

Problems

  • ✗
    No DNS over TCP
    Nameservers · DNS over TCP is required (RFC 7766); without it, large answers such as DNSSEC responses fail. Not answering over TCP: ns1.argewebhosting.eu (31.25.98.210): read tcp 46.225.38.91:54756->31.25.98.210:53: i/o timeout; ns1.argewebhosting.eu (2a05:1500:702:0:1c00:eff:fe00:ce): read tcp [2a01:4f8:1c1c:eebf::1]:44102->[2a05:1500:702:0:1c00:eff:fe00:ce]:53: i/o timeout.
    #19
  • !
    NSEC3 with extra iterations or salt
    DNSSEC · NSEC3 uses 1 iteration and a 1-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

!

Full report

Domain & DNS report for simonlevelt.nl ›

Mail

fail

27 passed 2 warn 1 failed

Areas

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

Problems

  • ✗
    Weak DKIM key
    DKIM · RSA keys shorter than 1024 bits can be cracked and are ignored by receivers (RFC 8301): dkim (384 bits). Rotate to a 2048-bit key.
    #23
  • !
    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
  • !
    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 simonlevelt.nl ›