Mail domain report: six-group.com

SPF

pass

SPF record published

Found

Record: v=spf1 ip4:153.46.243.96/27 ip4:153.46.252.96/27 include:285283.spf01.hubspotemail.net include:spf.protection.outlook.com include:_spf-dc33.sapsf.eu ip4:130.214.193.81 a:smtp.cetrel.lu ip4:153.46.105.72 ip4:153.46.97.104 -all
DNS lookups: 4 of 10
Void lookups: 0 of 2

Checks

✓ No deprecated ptr mechanism #1

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

SPF record needs 4 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.six-group.com)

Found

Record: v=DMARC1;p=reject;rua=mailto:4be8224a45@rua.easydmarc.eu,mailto:dmarc@six-group.com;ruf=mailto:4be8224a45@ruf.easydmarc.eu,mailto:forensic.dmarc@six-group.com;fo=1;
Found at: _dmarc.six-group.com
External report address: mailto:4be8224a45@rua.easydmarc.eu (authorized)
External report address: mailto:4be8224a45@ruf.easydmarc.eu (authorized)

Tag	Value	Meaning
v	DMARC1	Version
p	reject	Policy
rua	mailto:4be8224a45@rua.easydmarc.eu,mailto:dmarc@six-group.com	Aggregate report addresses
ruf	mailto:4be8224a45@ruf.easydmarc.eu,mailto:forensic.dmarc@six-group.com	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.
✓ Aggregate reports enabled #19

Aggregate reports are sent to: mailto:4be8224a45@rua.easydmarc.eu, mailto:dmarc@six-group.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

pass

Selectors: selector1, selector2

Found

Selectors: selector1, selector2
_domainkey: NOERROR

Selector	Key	Flags
selector1	RSA 2048 bits
selector2	RSA 2048 bits

Checks

✓ Keys found: selector1, selector2 #7

DKIM keys found for this domain with selectors: selector1, selector2
✓ Strong keys #23

DKIM keys are strong enough: selector1: RSA 2048 bits; selector2: RSA 2048 bits.
✓ 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 (4)
DS at parent: Yes
Algorithms: RSASHA256 (8)
Key tags: 12723, 59059, 2302, 43281
Signatures valid until: 25 October 2026, 22:15 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 expire in 84h0m0s

DNSKEY signatures expire at 2026-10-25T22:15:52Z (in 84h0m0s). Check that re-signing works.

#21

MX

warn

8 mail servers

Found

Priority	Host	Records	Reverse DNS
10	mail10.six-group.com	A 153.46.243.100	mail10.six-group.com ✓
10	mail5.six-group.com	A 153.46.252.115	mail5.six-group.com ✓
10	mail6.six-group.com	A 153.46.243.116	mail6.six-group.com ✓
10	mail9.six-group.com	A 153.46.252.110	mail9.six-group.com ✓
30	mail11.six-group.com	A 153.46.252.117	mail11.six-group.com ✓
30	mail12.six-group.com	A 153.46.243.101	mail12.six-group.com ✓
30	mail7.six-group.com	A 153.46.252.111	mail7.six-group.com ✓
30	mail8.six-group.com	A 153.46.243.118	mail8.six-group.com ✓

Checks

✓ 8 MX records #9

Found 8 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: mail10.six-group.com, mail5.six-group.com, mail6.six-group.com, mail9.six-group.com, mail11.six-group.com, mail12.six-group.com, mail7.six-group.com, mail8.six-group.com

#11
✓ Redundant MX hosts #12

Found 8 MX records, which provides redundancy for email delivery.
!

More than 5 MX records

Found 8 MX records, which is more than the recommended maximum of 5. Too many MX records may indicate a misconfiguration.

#13
✓ 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

fail

MTA-STS record without policy · TLS-RPT · DANE on 0 of 8 MX hosts

Found

MTA-STS record: v=STSv1;id=20250915T141111;
Policy URL: https://mta-sts.six-group.com/.well-known/mta-sts.txt
Policy error: https://mta-sts.six-group.com/.well-known/mta-sts.txt returned HTTP 421
TLS-RPT record: v=TLSRPTv1;rua=mailto:4be8224a45@tls.easydmarc.com,tlsrpt@six-group.com;

DANE (TLSA records)

MX host	TLSA	DNSSEC
mail10.six-group.com	none	-
mail5.six-group.com	none	-
mail6.six-group.com	none	-
mail9.six-group.com	none	-
mail11.six-group.com	none	-
mail12.six-group.com	none	-
mail7.six-group.com	none	-
mail8.six-group.com	none	-

Checks

✓ Record published #32

MTA-STS record found with id 20250915T141111.
✗

Policy not reachable

The MTA-STS record exists but the policy could not be fetched, so senders ignore MTA-STS: https://mta-sts.six-group.com/.well-known/mta-sts.txt returned HTTP 421.

#33
✗

Invalid TLS-RPT record

Senders ignore the TLS-RPT record because of: report URI "tlsrpt@six-group.com" must be mailto: or https:.

#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