Mail domain report: naturalis.nl

SPF

pass

SPF record published

Found

Record: v=spf1 mx include:spf1.naturalis.nl include:_spf.google.com include:spf.afas.online include:spf.topdesk.net include:spf.mailjet.com include:_spf.salesforce.com a:naturalis.irisintranet.cloud -all
DNS lookups: 9 of 10
Void lookups: 0 of 2

Checks

✓ No deprecated ptr mechanism #1

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

SPF record needs 9 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.naturalis.nl)

Found

Record: v=DMARC1; p=reject; rua=mailto:312p0tws@ag.eu.dmarcadvisor.com; ruf=mailto:312p0tws@fr.eu.dmarcadvisor.com
Found at: _dmarc.naturalis.nl
External report address: mailto:312p0tws@ag.eu.dmarcadvisor.com (authorized)
External report address: mailto:312p0tws@fr.eu.dmarcadvisor.com (authorized)

Tag	Value	Meaning
v	DMARC1	Version
p	reject	Policy
rua	mailto:312p0tws@ag.eu.dmarcadvisor.com	Aggregate report addresses
ruf	mailto:312p0tws@fr.eu.dmarcadvisor.com	Failure 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:312p0tws@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, google

Found

Selectors: mail, google
_domainkey: NOERROR

Selector	Key	Flags
mail	RSA 1024 bits
google	RSA 2048 bits

Checks

✓ Keys found: mail, google #7

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

1024-bit DKIM key

1024-bit RSA keys are the minimum and are considered weak today: mail (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: 31215, 46431, 33685
Signatures valid until: 22 October 2026, 02:00 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 5h0m0s

DNSKEY signatures expire at 2026-10-22T02:00:00Z (in 5h0m0s). Check that re-signing works.

#21

MX

pass

5 mail servers

Found

Priority	Host	Records	Reverse DNS
1	aspmx.l.google.com	A 142.251.127.26 AAAA 2a00:1450:4001:c21::1a	lcfrai-in-f26.1e100.net ✓ lcfrai-in-f26.1e100.net ✓
5	alt1.aspmx.l.google.com	A 142.250.147.26 AAAA 2a00:1450:4025:c01::1a	rd-in-f26.1e100.net ✓ rd-in-f26.1e100.net ✓
5	alt2.aspmx.l.google.com	A 172.253.152.27 AAAA 2a00:1450:4010:c22::1b	yulpptr-in-f27.1e100.net ✓ yulpptr-in-f27.1e100.net ✓
10	aspmx2.googlemail.com	A 142.250.147.26 AAAA 2a00:1450:4025:c01::1b	rd-in-f26.1e100.net ✓ rd-in-f27.1e100.net ✓
10	aspmx3.googlemail.com	A 172.253.152.26 AAAA 2a00:1450:4010:c22::1b	yulpptr-in-f26.1e100.net ✓ yulpptr-in-f27.1e100.net ✓

Checks

✓ 5 MX records #9

Found 5 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.
✓ Redundant MX hosts #12

Found 5 MX records, which provides redundancy for email delivery.
✓ At most 5 MX records #13

Found 5 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 10 MX addresss have a PTR record that resolves back to them.

TLS

info

MTA-STS enforce · TLS-RPT · DANE on 0 of 5 MX hosts

Found

MTA-STS record: v=STSv1; id=20251118094900
Policy URL: https://mta-sts.naturalis.nl/.well-known/mta-sts.txt
Mode: enforce
Allowed MX: alt1.aspmx.l.google.com, alt2.aspmx.l.google.com, aspmx.l.google.com, aspmx2.googlemail.com, aspmx3.googlemail.com
Max age: 86400 seconds
TLS-RPT record: v=TLSRPTv1; rua=mailto:smtp-tls-reports@naturalis.nl

DANE (TLSA records)

MX host	TLSA	DNSSEC
aspmx.l.google.com	none	-
alt1.aspmx.l.google.com	none	-
alt2.aspmx.l.google.com	none	-
aspmx2.googlemail.com	none	-
aspmx3.googlemail.com	none	-

Checks

✓ Record published #32

MTA-STS record found with id 20251118094900.
✓ Policy enforced #33

The MTA-STS policy is enforced and cached for 24h0m0s.
✓ All MX hosts covered #34

Every MX host matches an mx: line of the MTA-STS policy.
✓ Reports enabled #35

TLS reports are sent to: mailto:smtp-tls-reports@naturalis.nl
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

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