Mail domain report: d66.nl

SPF

fail

SPF record published

Found

Record: v=spf1 include:spf.mailjet.com include:spf.protection.outlook.com include:_spf.exactonline.nl ip4:195.177.214.128/27 ip4:89.188.15.0/24 ip4:212.23.48.250/29 include:spf.cloudeu.oxcs.net include:_spf.exonet.nl include:sendgrid.net include:stripe.com -all
DNS lookups: 16 of 10
Void lookups: 0 of 2

Checks

✓ No deprecated ptr mechanism #1

No ptr mechanism found in SPF record.
✗

16 DNS lookups, over the limit of 10

SPF record needs 16 DNS lookups (including nested includes), more than the limit of 10. Receivers will return a permerror; reduce includes or flatten the record.

#2
✓ 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.d66.nl)

Found

Record: v=DMARC1; p=reject; sp=reject; aspf=r; adkim=r; pct=100; rua=mailto:62671b2406374cee965641212b5d1b4b@dmarc-reports.cloudflare.net; fo=0; rf=afrf; ri=86400;
Found at: _dmarc.d66.nl
External report address: mailto:62671b2406374cee965641212b5d1b4b@dmarc-reports.cloudflare.net (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:62671b2406374cee965641212b5d1b4b@dmarc-reports.cloudflare.net	Aggregate report addresses
adkim	r	DKIM alignment (r = relaxed, s = strict)
aspf	r	SPF alignment (r = relaxed, s = strict)
fo	0	Failure reporting options
rf	afrf	Failure report format
ri	86400	Report interval (seconds)

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:62671b2406374cee965641212b5d1b4b@dmarc-reports.cloudflare.net
✓ 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: default, selector1, s1, s2

Found

Selectors: default, selector1, s1, s2
_domainkey: NOERROR

Selector	Key	Flags
default	RSA 1024 bits
selector1	RSA 2048 bits
s1	RSA 2048 bits
s2	RSA 2048 bits

Checks

✓ Keys found: default, selector1, s1, s2 #7

DKIM keys found for this domain with selectors: default, selector1, s1, s2
!

1024-bit DKIM key

1024-bit RSA keys are the minimum and are considered weak today: default (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

pass

Signed, DS published at parent

Found

DNSKEY records: Yes (2)
DS at parent: Yes
Algorithms: ECDSAP256SHA256 (13)
Key tags: 34505, 2371
Signatures valid until: 19 December 2026, 15:15 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 2026-12-19 #21

DNSKEY signatures are valid until 2026-12-19T15:15:39Z.

MX

warn

1 mail server

Found

Priority	Host	Records	Reverse DNS
0	d66-nl.mail.protection.outlook.com	A 52.101.68.12 A 52.101.68.27 A 52.101.209.31 A 52.101.91.159 AAAA 2a01:111:f403:c967::c AAAA 2a01:111:f403:ca09::20 AAAA 2a01:111:f403:ca21::c AAAA 2a01:111:f403:ca21::8	mail-db9pr02cu00204.inbound.protection.outlook.com ✓ mail-db7pr03cu00503.inbound.protection.outlook.com ✓ mail-cpjpr05cu00207.inbound.protection.outlook.com ✓ mail-matpr04cu00207.inbound.protection.outlook.com ✓ mail-cpjpr05cu00204.inbound.protection.outlook.com ✓ mail-as8pr05cu00400.inbound.protection.outlook.com ✓ mail-matpr04cu00204.inbound.protection.outlook.com ✓ mail-matpr04cu00100.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 host	TLSA	DNSSEC
d66-nl.mail.protection.outlook.com	none	-

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

warn

https://media.d66.nl/uploads/2026/04/d66_logo_square.svg

Found

Record: v=BIMI1; l=https://media.d66.nl/uploads/2026/04/d66_logo_square.svg;
Found at: default._bimi.d66.nl
Logo: https://media.d66.nl/uploads/2026/04/d66_logo_square.svg

Checks

!

No certificate (a=)

The logo is published without a Verified Mark Certificate. Gmail and Apple Mail only show BIMI logos with a VMC or CMC; Yahoo shows it without one.

#38
✓ DMARC meets BIMI requirements #39

DMARC is enforced on all mail, as BIMI requires.