Mail domain report: cbr.nl

SPF

pass

SPF record published

Found

Record: v=spf1 ip4:3.123.206.219 ip4:3.68.129.51 include:spf1.cbr.nl include:spf.topdesk.net include:spf.floydhamilton.net include:spf.protection.outlook.com include:_spf.zivver.com include:spf.winkwaves.net include:mailservers.expoints.nl include:_spf.eu.mailgun.org -all
DNS lookups: 8 of 10
Void lookups: 0 of 2

Checks

✓ No deprecated ptr mechanism #1

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

SPF record needs 8 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.cbr.nl)

Found

Record: v=DMARC1; p=reject; sp=reject; np=reject; rua=mailto:n4nqpcbe@ag.eu.dmarcadvisor.com;
Found at: _dmarc.cbr.nl
External report address: mailto:n4nqpcbe@ag.eu.dmarcadvisor.com (authorized)

Tag	Value	Meaning
v	DMARC1	Version
p	reject	Policy
sp	reject	Subdomain policy
rua	mailto:n4nqpcbe@ag.eu.dmarcadvisor.com	Aggregate report addresses
np	reject

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:n4nqpcbe@ag.eu.dmarcadvisor.com
✓ 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

warn

Selectors: mail, selector1, selector2

Found

Selectors: mail, selector1, selector2
_domainkey: NOERROR

Selector	Key	Flags
mail	RSA 1024 bits
selector1	RSA 1024 bits
selector2	RSA 1024 bits

Checks

✓ Keys found: mail, selector1, selector2 #7

DKIM keys found for this domain with selectors: mail, selector1, selector2
!

1024-bit DKIM key

1024-bit RSA keys are the minimum and are considered weak today: mail (1024 bits), selector1 (1024 bits), selector2 (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

warn

Signed, DS published at parent

Found

DNSKEY records: Yes (3)
DS at parent: Yes
Algorithms: ECDSAP256SHA256 (13)
Key tags: 57564, 48285, 31342
Signatures valid until: 24 October 2026, 10:19 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 61h0m0s

DNSKEY signatures expire at 2026-10-24T10:19:44Z (in 61h0m0s). Check that re-signing works.

#21

MX

warn

2 mail servers

Found

Priority	Host	Records	Reverse DNS
50	smtp.cbr.nl	A 62.58.93.73	smtp.cbr.nl ✓
100	smtp2.cbr.nl	A 62.58.93.74	smtp2.cbr.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: smtp.cbr.nl, smtp2.cbr.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 2 MX addresss have a PTR record that resolves back to them.

TLS

fail

MTA-STS testing · TLS-RPT · DANE on 2 of 2 MX hosts

Found

MTA-STS record: v=STSv1; id=20260422130000Z;
Policy URL: https://mta-sts.cbr.nl/.well-known/mta-sts.txt
Mode: testing
Allowed MX: smtp.cbr.nl, smtp2.cbr.nl
Max age: 604800 seconds
TLS-RPT record: v=TLSRPTv1

DANE (TLSA records)

MX host	TLSA	DNSSEC
smtp.cbr.nl	3 1 1 c1a5b99fb4ea3c2c…	Yes
smtp2.cbr.nl	3 1 1 572b18b90a32179f…	Yes

Checks

✓ Record published #32

MTA-STS record found with id 20260422130000Z.
!

Policy in testing mode

With mode: testing, senders only report TLS problems (via TLS-RPT) and still deliver without TLS. Switch to mode: enforce once reports are clean.

#33
✓ All MX hosts covered #34

Every MX host matches an mx: line of the MTA-STS policy.
✗

Invalid TLS-RPT record

Senders ignore the TLS-RPT record because of: the rua= tag with at least one report address is missing.

#35
✓ DANE on all MX hosts #36

All 2 MX hosts 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