Mail domain report: gvb.nl

SPF

pass

SPF record published

Found

Record: v=spf1 ip4:185.163.189.32 ip4:193.161.150.56 ip4:83.96.254.7 ip4:217.19.238.48/29 ip4:185.47.224.26 ip4:185.103.19.109 ip4:185.103.19.108 ip4:35.214.208.81 ip4:35.214.213.218 ip4:35.214.183.81 ip4:35.214.212.238 include:spf.protection.outlook.com include:_spf.twikey.com include:mailplus.nl include:_spf.psm.knowbe4.com include:spf.topdesk.net include:spf.avetica.net ip4:20.16.106.125 -all
DNS lookups: 10 of 10
Void lookups: 0 of 2

Checks

✓ No deprecated ptr mechanism #1

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

SPF record needs 10 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.gvb.nl)

Found

Record: v=DMARC1; p=reject; rua=mailto:dmarc_info@gvb.nl,mailto:dmarc_agg@vali.email; ruf=mailto:dmarc_info@gvb.nl; fo=1
Found at: _dmarc.gvb.nl
External report address: mailto:dmarc_agg@vali.email (authorized)

Tag	Value	Meaning
v	DMARC1	Version
p	reject	Policy
rua	mailto:dmarc_info@gvb.nl,mailto:dmarc_agg@vali.email	Aggregate report addresses
ruf	mailto:dmarc_info@gvb.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.
✓ Aggregate reports enabled #19

Aggregate reports are sent to: mailto:dmarc_info@gvb.nl, mailto:dmarc_agg@vali.email
✓ 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: selector1, selector2, s1, s2

Found

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

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

Checks

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

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

1024-bit DKIM key

1024-bit RSA keys are the minimum and are considered weak today: selector1 (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

Not signed

Found

DNSKEY records: No (0)
DS at parent: No

Checks

!

Not enabled

DNSSEC is not enabled for this domain. Consider enabling DNSSEC to protect against DNS spoofing attacks.

#8

MX

warn

1 mail server

Found

Priority	Host	Records	Reverse DNS
0	gvb-nl.r-v1.mx.microsoft	A 52.101.209.28 A 52.101.91.159 A 52.101.181.153 A 52.101.68.29 AAAA 2a01:111:f403:ca48::12 AAAA 2a01:111:f403:ca04::b AAAA 2a01:111:f403:ca04::9 AAAA 2a01:111:f403:ca21::c	mail-cpjpr05cu00104.inbound.protection.outlook.com ✓ mail-matpr04cu00207.inbound.protection.outlook.com ✓ mail-wa4pr04cu00101.inbound.protection.outlook.com ✓ mail-dbapr03cu00105.inbound.protection.outlook.com ✓ mail-miypr05cu00202.inbound.protection.outlook.com ✓ mail-dbbpr03cu00103.inbound.protection.outlook.com ✓ mail-db7pr03cu00601.inbound.protection.outlook.com ✓ mail-matpr04cu00204.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

MTA-STS testing · TLS-RPT · DANE on 0 of 1 MX hosts

Found

MTA-STS record: v=STSv1; id=202412190001Z;
Policy URL: https://mta-sts.gvb.nl/.well-known/mta-sts.txt
Mode: testing
Allowed MX: gvb-nl.r-v1.mx.microsoft, *.mail.protection.outlook.com
Max age: 604800 seconds
TLS-RPT record: v=TLSRPTv1;rua=mailto:mailreports@gvb.nl

DANE (TLSA records)

MX host	TLSA	DNSSEC
gvb-nl.r-v1.mx.microsoft	none	-

Checks

✓ Record published #32

MTA-STS record found with id 202412190001Z.
!

Policy in testing mode

With mode: testing, senders only report TLS problems (via TLS-RPT) and still deliver without TLS. Switch to mode: enforce once reports are clean.

#33
✓ 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:mailreports@gvb.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