milieudefensie.nl

Checked 21 October 2026, 21:23 UTC · via 8.8.8.8
!Passed with warnings
27 passed 5 warnings 0 failed 1 info

SPF

pass

SPF record published

Found

Record
v=spf1 include:spf_f1.milieudefensie.nl include:spf_f2.milieudefensie.nl include:spf_f3.milieudefensie.nl include:spf_f4.milieudefensie.nl include:spf_f5.milieudefensie.nl include:spf_f6.milieudefensie.nl include:spf_f7.milieudefensie.nl include:spf_f8.milieudefensie.nl include:spf_f9.milieudefensie.nl include:spf_f10.milieudefensie.nl -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

pass

p=reject (_dmarc.milieudefensie.nl)

Found

Record
v=DMARC1; p=reject; rua=mailto:dmarc-reports@milieudefensie.nl; ruf=mailto:dmarc-reports@milieudefensie.nl; fo=1
Found at
_dmarc.milieudefensie.nl
TagValueMeaning
vDMARC1Version
prejectPolicy
ruamailto:dmarc-reports@milieudefensie.nlAggregate report addresses
rufmailto:dmarc-reports@milieudefensie.nlFailure report addresses
fo1Failure reporting options

Checks

  • ✓ Policy: reject #4
    DMARC policy is set to 'reject', which provides the strongest protection against email spoofing.
  • ✓ 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.
  • ✓ Aggregate reports enabled #19
    Aggregate reports are sent to: mailto:dmarc-reports@milieudefensie.nl
  • ✓ Subdomain policy: reject #20
    Subdomains are covered by policy 'reject'.
  • ✓ Report addresses in own domain #29
    All report addresses are in your own organizational domain.

DKIM

warn

Selectors: mail, mx, s1, s2

Found

Selectors
mail, mx, s1, s2
_domainkey
NOERROR
SelectorKeyFlags
mailRSA 2048 bitsh=sha256
mxRSA 1024 bits
s1RSA 2048 bits
s2RSA 2048 bits

Checks

  • ✓ Keys found: mail, mx, s1, s2 #7
    DKIM keys found for this domain with selectors: mail, mx, s1, s2
  • !
    1024-bit DKIM key
    1024-bit RSA keys are the minimum and are considered weak today: mx (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 (2)
DS at parent
Yes
Algorithms
ECDSAP256SHA256 (13)
Key tags
27079, 31537
Signatures valid until
18 November 2026, 06:22 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 2026-11-18 #21
    DNSKEY signatures are valid until 2026-11-18T06:22:18Z.

MX

warn

1 mail server

Found

PriorityHostRecordsReverse DNS
10mail.milieudefensie.nlA 45.135.57.93mail.milieudefensie.nl ✓

Checks

  • ✓ 1 MX record #9
    Found 1 MX records for this domain.
  • ✓ All hosts resolve #10
    All MX records resolve to valid IP addresses.
  • !
    Hosts without IPv6
    The following MX hosts could not be resolved to IPv6 addresses: mail.milieudefensie.nl
    #11
  • !
    Single MX host, no backup
    Only one MX record found. For better email reliability, consider adding at least one backup MX server.
    #12
  • ✓ At most 5 MX records #13
    Found 1 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 1 MX address have a PTR record that resolves back to them.

TLS

warn

no MTA-STS · no TLS-RPT · DANE on 1 of 1 MX hosts

Found

DANE (TLSA records)

MX hostTLSADNSSEC
mail.milieudefensie.nl3 1 1 8b588b2345affbb6…Yes

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
  • !
    Not configured
    MTA-STS or DANE is used without TLS-RPT, so you get no reports when senders fail to deliver because of TLS problems. Publish _smtp._tls TXT "v=TLSRPTv1; rua=mailto:...".
    #35
  • ✓ DANE on all MX hosts #36
    All 1 MX host publish DNSSEC-validated TLSA records.

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