zuid-holland.nl

Checked 21 October 2026, 21:27 UTC · via 8.8.8.8
!Passed with warnings
25 passed 4 warnings 0 failed 3 info

SPF

pass

SPF record published

Found

Record
v=spf1 mx include:spf.protection.outlook.com include:_spf.easycruit.com include:_spf.iprox.nl include:spf.eprov.nl include:_spf.formulierenserver.nl include:spf.zaaksysteem.nl include:spf.coachview.net include:spf.server.eu include:spf.flowmailer.net ip4:40.95.74.52 ip4:195.225.101.66 ip4:205.201.133.57 ip4:195.72.120.104 ip4:195.72.120.105 ip4:77.95.248.5 ip4:77.74.54.216 ip4:195.143.61.129 ip4:185.92.61.0/24 ip4:52.169.113.183 ip4:52.169.27.184 ip4:13.79.21.104 ip4:40.127.200.64 ip4:52.164.214.135 ip4:52.178.144.127 ip4:104.41.206.141 ip4:52.138.174.188 -all
DNS lookups
10 of 10
Void lookups
0 of 2

Checks

  • ✓ No deprecated ptr mechanism #1
    No ptr mechanism found in SPF record.
  • ✓ 10 of 10 DNS lookups #2
    SPF record needs 10 DNS lookups (limit is 10).
  • ✓ Ends with -all #3
    SPF record properly uses -all to restrict unauthorized senders.
  • ✓ Record published #6
    SPF record exists for this domain.
  • ✓ Single record #16
    Exactly one SPF record is published.
  • ✓ Valid syntax #25
    All SPF mechanisms and modifiers are valid.
  • ✓ No void lookups #26
    All include/redirect targets exist.
  • ✓ No overly broad IP ranges #27
    All ip4/ip6 ranges are narrow enough.

DMARC

warn

p=quarantine (_dmarc.zuid-holland.nl)

Found

Record
v=DMARC1; p=quarantine; sp=quarantine
Found at
_dmarc.zuid-holland.nl
TagValueMeaning
vDMARC1Version
pquarantinePolicy
spquarantineSubdomain policy

Checks

  • !
    Policy: quarantine
    DMARC policy is set to 'quarantine'. Consider upgrading to 'reject' for stronger protection once you've verified legitimate emails are passing authentication.
    #4
  • ✓ Record published #5
    DMARC record exists for this domain.
  • ✓ Valid syntax #17
    DMARC record syntax is valid.
  • ✓ Applies to 100% of mail #18
    DMARC policy applies to all failing mail.
  • !
    No aggregate reports (rua)
    DMARC record has no rua tag, so you receive no aggregate reports about who sends mail as your domain. Add rua=mailto:...
    #19
  • ✓ Subdomain policy: quarantine #20
    Subdomains are covered by policy 'quarantine'.

DKIM

warn

Selectors: dkim, k1

Found

Selectors
dkim, k1
_domainkey
NOERROR
SelectorKeyFlags
dkimRSA 2048 bits
k1RSA 1024 bits

Checks

  • ✓ Keys found: dkim, k1 #7
    DKIM keys found for this domain with selectors: dkim, k1
  • !
    1024-bit DKIM key
    1024-bit RSA keys are the minimum and are considered weak today: k1 (1024 bits). Rotate to a 2048-bit key.
    #23
  • ✓ No problematic flags #24
    No keys in test mode, revoked, or limited to SHA-1.

DNSSEC

pass

Signed, DS published at parent

Found

DNSKEY records
Yes (1)
DS at parent
Yes
Algorithms
ECDSAP256SHA256 (13)
Key tags
26773
Signatures valid until
29 October 2026, 00:00 UTC

Checks

  • ✓ Signed, DS published at parent #8
    DNSSEC is enabled for this domain (DNSKEY and DS present), providing additional security for DNS lookups.
  • ✓ Signatures valid until 2026-10-29 #21
    DNSKEY signatures are valid until 2026-10-29T00:00:00Z.

MX

pass

3 mail servers

Found

PriorityHostRecordsReverse DNS
100mx18.internl.netA 77.95.252.215 AAAA 2a00:1478:50:0:1209::1mx18.internl.net ✓ mx18.internl.net ✓
200fallback1.server.euA 85.119.243.10 AAAA 2a00:e760:100:0:5:1114:0:1fallback1.server.eu ✓ fallback1.server.eu ✓
300fallback2.server.euA 31.3.105.140 AAAA 2a03:7900:105:31:3:105:140:1fallback2.server.eu ✓ fallback2.server.eu ✓

Checks

  • ✓ 3 MX records #9
    Found 3 MX records for this domain.
  • ✓ All hosts resolve #10
    All MX records resolve to valid IP addresses.
  • ✓ All hosts have IPv6 #11
    All MX records resolve to IPv6 addresses.
  • ✓ Redundant MX hosts #12
    Found 3 MX records, which provides redundancy for email delivery.
  • ✓ At most 5 MX records #13
    Found 3 MX records, which is within the recommended range (1-5).
  • ✓ No localhost targets #14
    No MX records pointing to localhost found.
  • ✓ No private IP addresses #15
    No MX records resolving to private IP addresses found.
  • ✓ No CNAME targets #22
    No MX records point to a CNAME.
  • ✓ Reverse DNS confirmed #30
    All 6 MX addresss have a PTR record that resolves back to them.

TLS

warn

no MTA-STS · no TLS-RPT · DANE on 0 of 3 MX hosts

Found

DANE (TLSA records)

MX hostTLSADNSSEC
mx18.internl.netnone-
fallback1.server.eunone-
fallback2.server.eunone-

Checks

  • !
    Not configured
    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
  • i
    Not configured
    TLS-RPT lets senders report TLS delivery problems to you. It is most useful together with MTA-STS or DANE.
    #35
  • i
    Not used
    No MX host publishes TLSA records. DANE lets senders verify your mail server's certificate through DNSSEC; it requires DNSSEC on the MX host's zone.
    #36

BIMI

info

No BIMI record

Checks

  • i
    Not configured
    BIMI shows your logo next to your mail in supporting mail clients. It requires DMARC enforcement.
    #38