nbdbiblion.nl

Checked 22 October 2026, 14:40 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 ip4:51.138.91.228 include:spf.protection.outlook.com include:spf.emailsignatures365.com include:spf.afas.online include:mail.eu1.inforcloudsuite.com include:mailoutgoing.swis.nl include:customers.clickdimensions.com a:mail-in-2.signet.nl include:_spf.exsilia.net ip4:198.37.154.52 ip4:193.37.205.65 ip4:193.37.205.64 ip4:193.37.205.89 -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.nbdbiblion.nl)

Found

Record
v=DMARC1; p=quarantine; pct=100; rua=mailto:rua@nbdbiblion.nl; ruf=mailto:ruf@nbdbiblion.nl; fo=1
Found at
_dmarc.nbdbiblion.nl
TagValueMeaning
vDMARC1Version
pquarantinePolicy
pct100Percentage of mail the policy applies to
ruamailto:rua@nbdbiblion.nlAggregate report addresses
rufmailto:ruf@nbdbiblion.nlFailure report addresses
fo1Failure reporting options

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:rua@nbdbiblion.nl
  • ✓ Subdomain policy: quarantine #20
    Subdomains are covered by policy 'quarantine'.
  • ✓ Report addresses in own domain #29
    All report addresses are in your own organizational domain.

DKIM

pass

Selectors: selector1, selector2

Found

Selectors
selector1, selector2
_domainkey
NOERROR
SelectorKeyFlags
selector1RSA 2048 bits
selector2RSA 2048 bits

Checks

  • ✓ Keys found: selector1, selector2 #7
    DKIM keys found for this domain with selectors: selector1, selector2
  • ✓ Strong keys #23
    DKIM keys are strong enough: selector1: RSA 2048 bits; selector2: 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
56068
Signatures valid until
5 November 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 2026-11-05 #21
    DNSKEY signatures are valid until 2026-11-05T00:00:00Z.

MX

warn

2 mail servers

Found

PriorityHostRecordsReverse DNS
10nbdbiblion-nl.mail.protection.outlook.comA 52.101.68.27 A 52.101.68.12 A 52.101.209.31 A 52.101.185.21 AAAA 2a01:111:f403:ca3c::8 AAAA 2a01:111:f403:ca09::22 AAAA 2a01:111:f403:ca38::8 AAAA 2a01:111:f403:c967::amail-db7pr03cu00503.inbound.protection.outlook.com ✓ mail-db9pr02cu00204.inbound.protection.outlook.com ✓ mail-cpjpr05cu00207.inbound.protection.outlook.com ✓ mail-zrxpr05cu00105.inbound.protection.outlook.com ✓ mail-zrxpr05cu00100.inbound.protection.outlook.com ✓ mail-am7pr02cu00302.inbound.protection.outlook.com ✓ mail-wa4pr04cu00100.inbound.protection.outlook.com ✓ mail-cpjpr05cu00102.inbound.protection.outlook.com ✓
20relay.surfnet.nlA 192.87.5.181relay.surfnet.nl ✓

Checks

  • ✓ 2 MX records #9
    Found 2 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: relay.surfnet.nl
    #11
  • ✓ Redundant MX hosts #12
    Found 2 MX records, which provides redundancy for email delivery.
  • ✓ At most 5 MX records #13
    Found 2 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 9 MX addresss have a PTR record that resolves back to them.

TLS

warn

no MTA-STS · no TLS-RPT · DANE on 1 of 2 MX hosts

Found

DANE (TLSA records)

MX hostTLSADNSSEC
nbdbiblion-nl.mail.protection.outlook.comnone-
relay.surfnet.nl3 1 1 6f235edd413d2ebb…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
  • !
    Not all MX hosts use DANE
    These MX hosts publish no TLSA records, so mail to them is not protected by DANE: nbdbiblion-nl.mail.protection.outlook.com.
    #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