Mail domain report: huldenberg.be

SPF

pass

SPF record published

Found

Record: v=spf1 include:spf.flexmail.eu include:spf.protection.outlook.com include:mailgun.org include:oclcspf3.oclc.org include:spf.brevo.com ip4:81.82.235.156 ip4:209.126.180.213 ip4:71.6.150.143 ip4:193.104.8.0/24 ip4:91.208.211.62 ip4:185.3.217.140 ip4:212.72.62.129/27 -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

warn

p=quarantine (_dmarc.huldenberg.be)

Found

Record: v=DMARC1; p=quarantine; pct=10
Found at: _dmarc.huldenberg.be

Tag	Value	Meaning
v	DMARC1	Version
p	quarantine	Policy
pct	10	Percentage of mail the policy applies to

Checks

!

Policy: quarantine

DMARC policy is set to 'quarantine'. Consider upgrading to 'reject' for stronger protection once you've verified legitimate emails are passing authentication.

#4
✓ Record published #5

DMARC record exists for this domain.
✓ Valid syntax #17

DMARC record syntax is valid.
!

Applies to 10% of mail

DMARC policy only applies to 10% of failing mail (pct=10). Raise pct to 100 once you are confident in your setup.

#18
!

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: quarantine #20

Subdomains are covered by policy 'quarantine'.

DKIM

warn

Selectors: email, s1, s2

Found

Selectors: email, s1, s2
_domainkey: NOERROR

Selector	Key	Flags
email	RSA 1024 bits
s1	RSA 2048 bits
s2	RSA 2048 bits

Checks

✓ Keys found: email, s1, s2 #7

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

1024-bit DKIM key

1024-bit RSA keys are the minimum and are considered weak today: email (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 (1)
DS at parent: Yes
Algorithms: ECDSAP256SHA256 (13)
Key tags: 6531
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

3 mail servers

Found

Priority	Host	Records	Reverse DNS
0	huldenberg-be.mail.protection.outlook.com	A 52.101.68.25 A 52.101.209.28 A 52.101.103.39 A 52.101.209.153 AAAA 2a01:111:f403:ca04::9 AAAA 2a01:111:f403:ca48::10 AAAA 2a01:111:f403:ca3c::6 AAAA 2a01:111:f403:ca48::e	mail-db8pr02cu00101.inbound.protection.outlook.com ✓ mail-cpjpr05cu00104.inbound.protection.outlook.com ✓ mail-miypr05cu00207.inbound.protection.outlook.com ✓ mail-cpjpr04cu00101.inbound.protection.outlook.com ✓ mail-db7pr03cu00601.inbound.protection.outlook.com ✓ mail-miypr05cu00100.inbound.protection.outlook.com ✓ mail-zrxpr04cu00106.inbound.protection.outlook.com ✓ mail-miypr03cu00206.inbound.protection.outlook.com ✓
10	mxa.eu.mailgun.org	A 34.111.130.244	244.130.111.34.bc.googleusercontent.com ✓
10	mxb.eu.mailgun.org	A 34.111.130.244	244.130.111.34.bc.googleusercontent.com ✓

Checks

✓ 3 MX records #9

Found 3 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: mxa.eu.mailgun.org, mxb.eu.mailgun.org

#11
✓ Redundant MX hosts #12

Found 3 MX records, which provides redundancy for email delivery.
✓ At most 5 MX records #13

Found 3 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

warn

no MTA-STS · no TLS-RPT · DANE on 0 of 3 MX hosts

Found

DANE (TLSA records)

MX host	TLSA	DNSSEC
huldenberg-be.mail.protection.outlook.com	none	-
mxa.eu.mailgun.org	none	-
mxb.eu.mailgun.org	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