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hartstichting.nl

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

Domain & DNS

error

21 passed 1 warn 1 failed 1 errors

lookups failed for dnssec; results are incomplete

Areas

iRegistration iDelegation ✗Nameservers !SOA iDNSSEC 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 46.225.38.91:52222->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]:45396->[2a05:1500:702:0:1c00:eff:fe00:ce]:53: i/o timeout.
    #19
  • !
    Unusual SOA timers
    SOA · refresh 5m is outside 20m–1d; retry 1h should be shorter than refresh 5m. Current values: refresh 5m, retry 1h, expire 7d, negative TTL 3h.
    #23

Recent checks

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Full report

Domain & DNS report for hartstichting.nl ›

Mail

error

25 passed 5 warn 0 failed 1 errors

lookups failed for dnssec; results are incomplete

Areas

!SPF ✓DMARC !DKIM iDNSSEC !MX !TLS iBIMI

Problems

  • !
    4 of 10 DNS lookups, with problems
    SPF · SPF record needs 4 DNS lookups (limit is 10). Problems found: include:_sph2khs0q2.sdmarc.net could not be resolved: DNS query for _sph2khs0q2.sdmarc.net failed: read udp 46.225.38.91:33797->8.8.8.8:53: i/o timeout.
    #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: mail (1024 bits). Rotate to a 2048-bit key.
    #23
  • !
    Reverse DNS does not match
    MX · The PTR name of these addresses does not resolve back to the same address: 52.101.103.39 -> mail-miypr05cu00207.inbound.protection.outlook.com.
    #30
  • !
    Policy in testing mode
    TLS · With mode: testing, senders only report TLS problems (via TLS-RPT) and still deliver without TLS. Switch to mode: enforce once reports are clean.
    #33

Recent checks

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