Mail domain report: mindef.nl

SPF

pass

SPF record published

Found

Record: v=spf1 ip4:217.169.235.200 ip4:217.169.235.201 ip6:2a04:8f80:2105:4003::10 ip6:2a04:8f80:2105:4003::11 ip6:2a04:8f80:2105:4003::12 ip6:2a04:8f80:2105:4003::13 ip6:2a04:8f80:2105:4003::14 ip6:2a04:8f80:2105:4003::15 -all
DNS lookups: 0 of 10
Void lookups: 0 of 2

Checks

✓ No deprecated ptr mechanism #1

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

SPF record needs 0 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.mindef.nl)

Found

Record: v=DMARC1;p=reject;rua=mailto:dmarcrepa@mindef.nl,mailto:dmarc_rua@emaildefense.proofpoint.com;ruf=mailto:dmarcrepf@mindef.nl;pct=100;sp=reject;fo=0
Found at: _dmarc.mindef.nl
External report address: mailto:dmarc_rua@emaildefense.proofpoint.com (authorized)

Tag	Value	Meaning
v	DMARC1	Version
p	reject	Policy
sp	reject	Subdomain policy
pct	100	Percentage of mail the policy applies to
rua	mailto:dmarcrepa@mindef.nl,mailto:dmarc_rua@emaildefense.proofpoint.com	Aggregate report addresses
ruf	mailto:dmarcrepf@mindef.nl	Failure report addresses
fo	0	Failure 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:dmarcrepa@mindef.nl, mailto:dmarc_rua@emaildefense.proofpoint.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

No keys found under the checked selectors

Found

Selectors: None found
_domainkey: NOERROR

Checks

!

No key under common selectors

The _domainkey name exists but no DKIM key was found under the common selectors. Selectors are provider-specific; check yours with -selector.

#7

DNSSEC

warn

Signed, DS published at parent

Found

DNSKEY records: Yes (4)
DS at parent: Yes
Algorithms: RSASHA256 (8)
Key tags: 11297, 6316, 65139, 16221
Signatures valid until: 26 October 2026, 10:45 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 92h0m0s

DNSKEY signatures expire at 2026-10-26T10:45:02Z (in 92h0m0s). Check that re-signing works.

#21

MX

warn

1 mail server

Found

Priority	Host	Records	Reverse DNS
10	mx.mindef.nl	A 217.169.224.174 AAAA 2a04:8f80:2105:3001::10	mx.mindef.nl ✓ mx.mindef.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.
✓ 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 2 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
mx.mindef.nl	3 1 1 2826ce4f4ee4776a…	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