Mail domain report: nn.nl

SPF

pass

SPF record published

Found

Record: v=spf1 include:spf.insim.biz include:spf.mailtopay.nl include:_spf.salesforce.com include:spf.mandrillapp.com ip4:46.31.48.0/21 ip4:62.50.78.150 ip4:18.196.215.67 ip4:84.53.65.32 ip4:84.53.65.25 ip4:77.73.231.209 ip4:78.31.119.34 ip4:212.114.113.4 ip4:212.114.113.223 ip4:212.114.113.224 ip4:212.114.113.225 ip4:212.114.113.218 ip4:78.31.119.16 ip4:82.199.69.32/27 ip4:82.199.70.59 ip4:82.199.69.59 -all
DNS lookups: 7 of 10
Void lookups: 0 of 2

Checks

✓ No deprecated ptr mechanism #1

No ptr mechanism found in SPF record.
✓ 7 of 10 DNS lookups #2

SPF record needs 7 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.nn.nl)

Found

Record: v=DMARC1; p=reject; rua=mailto:dmarc_agg@vali.email
Found at: _dmarc.nn.nl
External report address: mailto:dmarc_agg@vali.email (authorized)

Tag	Value	Meaning
v	DMARC1	Version
p	reject	Policy
rua	mailto:dmarc_agg@vali.email	Aggregate report addresses

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_agg@vali.email
✓ Subdomain policy: reject #20

Subdomains are covered by policy 'reject'.
✓ External report addresses authorized #29

Report addresses in other domains have published their authorization.

DKIM

pass

Selectors: selector1, selector2

Found

Selectors: selector1, selector2
_domainkey: NOERROR

Selector	Key	Flags
selector1	RSA 2048 bits
selector2	RSA 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

warn

Signed, DS published at parent

Found

DNSKEY records: Yes (3)
DS at parent: Yes
Algorithms: ECDSAP256SHA256 (13)
Key tags: 4803, 13592, 63634
Signatures valid until: 24 October 2026, 07:00 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 expire in 58h0m0s

DNSKEY signatures expire at 2026-10-24T07:00:28Z (in 58h0m0s). Check that re-signing works.

#21

MX

warn

1 mail server

Found

Priority	Host	Records	Reverse DNS
10	nn-nl.w-v1.mx.microsoft	A 52.101.68.10 A 52.101.209.153 A 52.101.68.21 A 52.101.73.123	mail-dbbpr03cu00102.inbound.protection.outlook.com ✓ mail-cpjpr04cu00101.inbound.protection.outlook.com ✓ mail-db4pr02cu00205.inbound.protection.outlook.com ✓ mail-am6pr02cu00203.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.
!

Hosts without IPv6

The following MX hosts could not be resolved to IPv6 addresses: nn-nl.w-v1.mx.microsoft

#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 4 MX addresss 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 host	TLSA	DNSSEC
nn-nl.w-v1.mx.microsoft	3 1 1 cfd68bde4129c00a… 2 0 1 ea7a25255d111fc3… 3 1 1 803f7447cc75b208… 3 1 1 54883cc5f1849331… 2 0 1 c1ad7778796d20bc…	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

pass

https://vmc.digicert.eu/610d3ce0-3c1a-4363-8fd9-6dd991d5f541.svg

Found

Record: v=BIMI1; l=https://vmc.digicert.eu/610d3ce0-3c1a-4363-8fd9-6dd991d5f541.svg; a=https://vmc.digicert.eu/610d3ce0-3c1a-4363-8fd9-6dd991d5f541.pem;
Found at: default._bimi.nn.nl
Logo: https://vmc.digicert.eu/610d3ce0-3c1a-4363-8fd9-6dd991d5f541.svg
Certificate: https://vmc.digicert.eu/610d3ce0-3c1a-4363-8fd9-6dd991d5f541.pem

Checks

✓ Logo and certificate published #38

BIMI logo: https://vmc.digicert.eu/610d3ce0-3c1a-4363-8fd9-6dd991d5f541.svg; certificate: https://vmc.digicert.eu/610d3ce0-3c1a-4363-8fd9-6dd991d5f541.pem
✓ DMARC meets BIMI requirements #39

DMARC is enforced on all mail, as BIMI requires.