Mail domain report: ioresearch.nl

SPF

warn

SPF record published

Found

Record: v=spf1 ip4:85.17.209.68 ip4:83.98.197.35 ip4:46.19.218.153 ip4:188.122.70.207 ip4:172.246.57.200 ip4:209.67.69.0/24 ip4:87.249.107.128/27 ip4:217.114.97.128/28 ip4:217.114.102.160/27 ip4:213.249.66.58 ip4:213.249.66.8/32 ip4:213.249.66.9/32 ip4:213.249.66.11/32 ip4:213.249.64.225/32 ip4:213.249.66.225/32 ip6:2a01:448:1:1002::8/128 ip6:2a01:448:1:1002::9/128 ip6:2a01:448:1:1002::11/128 ip6:2a01:448:1::1097:64:226/128 ip6:2a01:448:1:1002::226/128 ip4:52.100.0.0/14 ip4:51.4.72.0/24 ip4:51.5.72.0/24 ip4:51.5.80.0/27 ip4:20.47.149.138/32 ip4:148.105.8.0/21 ip4:185.41.28.0/22 ip4:94.143.16.0/21 ip4:185.24.144.0/22 ip4:153.92.224.0/19 ip4:213.32.128.0/18 ip4:185.107.232.0/22 ip4:77.32.128.0/18 ip4:77.32.192.0/19 ip4:212.146.192.0/18 ip4:172.246.0.0/18 ip4:188.122.70.192/26 ip6:2a00:1630:128::/48 ip4:45.84.218.0/24 ip6:2a0f:e382::/32 ip4:143.55.146.210 include:desan.nl include:sendgrid.net include:spf.topdesk.net include:spf.mandrillapp.com include:spf.protection.outlook.com -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.
!

Broad IP ranges

These ranges authorize tens of thousands of addresses or more: ip4:52.100.0.0/14. Check that you really own and send from all of them.

#27

DMARC

warn

p=reject (_dmarc.ioresearch.nl)

Found

Record: v=DMARC1; p=reject;ruf=mailto:dmarc@ioresearch.nl;fo=1
Found at: _dmarc.ioresearch.nl

Tag	Value	Meaning
v	DMARC1	Version
p	reject	Policy
ruf	mailto:dmarc@ioresearch.nl	Failure report addresses
fo	1	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.
!

No aggregate reports (rua)

DMARC record has no rua tag, so you receive no aggregate reports about who sends mail as your domain. Add rua=mailto:...

#19
✓ Subdomain policy: reject #20

Subdomains are covered by policy 'reject'.
✓ Report addresses in own domain #29

All report addresses are in your own organizational domain.

DKIM

warn

Selectors: mail, k1, selector1, selector2, s1, s2

Found

Selectors: mail, k1, selector1, selector2, s1, s2
_domainkey: NOERROR

Selector	Key	Flags
mail	RSA 1024 bits
k1	RSA 1024 bits
selector1	RSA 2048 bits
selector2	RSA 2048 bits
s1	RSA 2048 bits
s2	RSA 2048 bits

Checks

✓ Keys found: mail, k1, selector1, selector2, s1, s2 #7

DKIM keys found for this domain with selectors: mail, k1, selector1, selector2, s1, s2
!

1024-bit DKIM key

1024-bit RSA keys are the minimum and are considered weak today: mail (1024 bits), k1 (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: RSASHA256 (8)
Key tags: 9193, 46811
Signatures valid until: 5 November 2026, 00:00 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 valid until 2026-11-05 #21

DNSKEY signatures are valid until 2026-11-05T00:00:00Z.

MX

warn

1 mail server

Found

Priority	Host	Records	Reverse DNS
0	ioresearch-nl.mail.protection.outlook.com	A 52.101.68.12 A 52.101.185.24 A 52.101.73.155 A 52.101.68.8 AAAA 2a01:111:f403:ca04::4 AAAA 2a01:111:f403:ca04::e AAAA 2a01:111:f403:ca21::c AAAA 2a01:111:f403:ca09::28	mail-db9pr02cu00204.inbound.protection.outlook.com ✓ mail-zrxpr07cu00100.inbound.protection.outlook.com ✓ mail-am7pr02cu00203.inbound.protection.outlook.com ✓ mail-du0pr03cu00100.inbound.protection.outlook.com ✓ mail-db4pr02cu00204.inbound.protection.outlook.com ✓ mail-db8pr02cu00106.inbound.protection.outlook.com ✓ mail-matpr04cu00204.inbound.protection.outlook.com ✓ mail-am6pr02cu00300.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
ioresearch-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

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