Mail domain report: skor.nl

SPF

fail

SPF record published

Found

Record: v=spf1 a mx mx:mx1.webinfra.nl include:_spf.act-on.net include:spf.afas.online include:_spf.cobytes.email include:amazonses.com include:spf.protection.outlook.com include:spf.innovationsoft.nl include:spf.flowmailer.net include:spf.skorm2.hypernode.io ip4:171.33.132.128/26 ip4:213.136.14.112/28 ip4:213.136.26.192/27 ip4:46.31.48.0/21 ~all
DNS lookups: 13 of 10
Void lookups: 0 of 2

Checks

✓ No deprecated ptr mechanism #1

No ptr mechanism found in SPF record.
✗

13 DNS lookups, over the limit of 10

SPF record needs 13 DNS lookups (including nested includes), more than the limit of 10. Receivers will return a permerror; reduce includes or flatten the record.

#2
✓ 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.skor.nl)

Found

Record: v=DMARC1; p=quarantine; sp=quarantine; fo=1
Found at: _dmarc.skor.nl

Tag	Value	Meaning
v	DMARC1	Version
p	quarantine	Policy
sp	quarantine	Subdomain policy
fo	1	Failure reporting options

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 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: quarantine #20

Subdomains are covered by policy 'quarantine'.

DKIM

warn

Selectors: s1, s2

Found

Selectors: s1, s2
_domainkey: NOERROR

Selector	Key	Flags
s1	RSA 2048 bits
s2	RSA 1024 bits

Checks

✓ Keys found: s1, s2 #7

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

1024-bit DKIM key

1024-bit RSA keys are the minimum and are considered weak today: s2 (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
10	skor-nl.mail.protection.outlook.com	A 52.101.68.27 A 52.101.68.12 A 52.101.103.140 A 52.101.103.137 AAAA 2a01:111:f403:ca04::e AAAA 2a01:111:f403:ca04::d AAAA 2a01:111:f403:ca3c::a AAAA 2a01:111:f403:ca48::e	mail-db7pr03cu00503.inbound.protection.outlook.com ✓ mail-db9pr02cu00204.inbound.protection.outlook.com ✓ mail-miypr02cu00204.inbound.protection.outlook.com ✓ mail-miypr02cu00101.inbound.protection.outlook.com ✓ mail-db8pr02cu00106.inbound.protection.outlook.com ✓ mail-db6pr03cu00105.inbound.protection.outlook.com ✓ mail-zrxpr07cu00102.inbound.protection.outlook.com ✓ mail-miypr03cu00206.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
skor-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