rathenau.nl

Checked 21 October 2026, 21:24 UTC · via 8.8.8.8
!Passed with warnings
27 passed 3 warnings 0 failed 3 info

SPF

pass

SPF record published

Found

Record
v=spf1 include:_spf.knaw.nl include:spf.protection.outlook.com include:_spf.mailplus.nl ip4:194.165.34.0/24 ip4:5.172.45.224/27 ip4:185.223.163.66 include:_spf.argewebhosting.nl include:_spf-dc55.sapsf.eu include:spf.eprov.eu include:spf.tribecrm.nl -all
DNS lookups
9 of 10
Void lookups
0 of 2

Checks

  • ✓ No deprecated ptr mechanism #1
    No ptr mechanism found in SPF record.
  • ✓ 9 of 10 DNS lookups #2
    SPF record needs 9 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.rathenau.nl)

Found

Record
v=DMARC1; p=quarantine; rua=mailto:dmarc@knaw.nl; ruf=mailto:dmarc@knaw.nl; rf=iodef;
Found at
_dmarc.rathenau.nl
External report address
mailto:dmarc@knaw.nl (authorized)
TagValueMeaning
vDMARC1Version
pquarantinePolicy
ruamailto:dmarc@knaw.nlAggregate report addresses
rufmailto:dmarc@knaw.nlFailure report addresses
rfiodefFailure report format

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.
  • ✓ Aggregate reports enabled #19
    Aggregate reports are sent to: mailto:dmarc@knaw.nl
  • ✓ Subdomain policy: quarantine #20
    Subdomains are covered by policy 'quarantine'.
  • ✓ External report addresses authorized #29
    Report addresses in other domains have published their authorization.

DKIM

pass

Selectors: default, selector1

Found

Selectors
default, selector1
_domainkey
NOERROR
SelectorKeyFlags
defaultRSA 2048 bits
selector1RSA 2048 bits

Checks

  • ✓ Keys found: default, selector1 #7
    DKIM keys found for this domain with selectors: default, selector1
  • ✓ Strong keys #23
    DKIM keys are strong enough: default: RSA 2048 bits; selector1: RSA 2048 bits.
  • ✓ 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
29360
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

warn

1 mail server

Found

PriorityHostRecordsReverse DNS
0rathenau-nl.mail.protection.outlook.comA 52.101.73.120 A 52.101.91.21 A 52.101.103.36 A 52.101.73.126 AAAA 2a01:111:f403:ca48::c AAAA 2a01:111:f403:ca04::4 AAAA 2a01:111:f403:ca04::e AAAA 2a01:111:f403:ca48::email-am7pr02cu00300.inbound.protection.outlook.com ✓ mail-matpr05cu00105.inbound.protection.outlook.com ✓ mail-miypr05cu00104.inbound.protection.outlook.com ✓ mail-am8pr83cu00106.inbound.protection.outlook.com ✓ mail-miypr03cu00104.inbound.protection.outlook.com ✓ mail-db4pr02cu00204.inbound.protection.outlook.com ✓ mail-db8pr02cu00106.inbound.protection.outlook.com ✓ mail-miypr03cu00206.inbound.protection.outlook.com ✓

Checks

  • ✓ 1 MX record #9
    Found 1 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.
  • !
    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 8 MX addresss have a PTR record that resolves back to them.

TLS

warn

no MTA-STS · no TLS-RPT · DANE on 0 of 1 MX hosts

Found

DANE (TLSA records)

MX hostTLSADNSSEC
rathenau-nl.mail.protection.outlook.comnone-

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