Mail domain report: sp.nl

SPF

pass

SPF record published

Found

Record: v=spf1 ip4:95.215.190.29 ip6:2a00:51c0:10:1203::1d include:procurios.cloud include:spf.protection.outlook.com include:_spf.transip.email ip4:199.127.232.0/22 ip4:199.255.192.0/22 ip4:206.55.144.0/20 ip4:216.221.160.0/19 ip4:23.249.208.0/20 ip4:23.251.224.0/19 ip4:24.110.64.0/18 ip4:54.240.0.0/18 ip4:54.240.64.0/18 ip4:69.169.224.0/20 ip4:76.223.128.0/19 ip4:76.223.176.0/20 ip4:104.130.122.0/23 ip4:104.130.96.0/28 ip4:141.193.32.0/23 ip4:143.55.224.0/21 ip4:143.55.232.0/22 ip4:143.55.236.0/22 ip4:146.20.112.0/26 ip4:146.20.113.0/24 ip4:146.20.191.0/24 ip4:159.112.240.0/20 ip4:159.135.132.128/25 ip4:159.135.140.80/29 ip4:159.135.224.0/20 ip4:161.38.192.0/20 ip4:161.38.204.0/22 ip4:166.78.68.0/22 ip4:185.189.236.0/22 ip4:185.211.120.0/22 ip4:185.250.236.0/22 ip4:192.237.158.0/23 ip4:198.244.48.0/20 ip4:198.244.60.0/22 ip4:198.61.254.0/23 ip4:204.220.160.0/21 ip4:204.220.168.0/21 ip4:204.220.176.0/20 ip4:209.61.151.0/24 ip4:23.253.182.0/23 ip4:69.72.32.0/20 ip4:87.253.232.0/21 -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.sp.nl)

Found

Record: v=DMARC1; p=reject; rua=mailto:postmaster@sp.nl; ruf=mailto:postmaster@sp.nl; rf=afrf; sp=reject; fo=0:1:d:s; pct=100; ri=86400; adkim=s; aspf=s
Found at: _dmarc.sp.nl

Tag	Value	Meaning
v	DMARC1	Version
p	reject	Policy
sp	reject	Subdomain policy
pct	100	Percentage of mail the policy applies to
rua	mailto:postmaster@sp.nl	Aggregate report addresses
ruf	mailto:postmaster@sp.nl	Failure report addresses
adkim	s	DKIM alignment (r = relaxed, s = strict)
aspf	s	SPF alignment (r = relaxed, s = strict)
fo	0:1:d:s	Failure reporting options
rf	afrf	Failure report format
ri	86400	Report interval (seconds)

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:postmaster@sp.nl
✓ 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

Found

Selectors: mail, k1
_domainkey: NOERROR

Selector	Key	Flags
mail	RSA 2048 bits
k1	RSA 1024 bits

Checks

✓ Keys found: mail, k1 #7

DKIM keys found for this domain with selectors: mail, k1
!

1024-bit DKIM key

1024-bit RSA keys are the minimum and are considered weak today: 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: ECDSAP256SHA256 (13)
Key tags: 34505, 2371
Signatures valid until: 19 December 2026, 10:04 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 2026-12-19 #21

DNSKEY signatures are valid until 2026-12-19T10:04:43Z.

MX

warn

1 mail server

Found

Priority	Host	Records	Reverse DNS
10	mail.sp.nl	A 95.215.190.29 AAAA 2a00:51c0:10:1203::1d	mail.sp.nl ✓ mail.sp.nl ✓

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 2 MX addresss have a PTR record that resolves back to them.

TLS

warn

no MTA-STS · no TLS-RPT · DANE on 1 of 1 MX hosts

Found

DANE (TLSA records)

MX host	TLSA	DNSSEC
mail.sp.nl	3 1 1 40cdaeb0841d089a…	Yes

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
!

Not configured

MTA-STS or DANE is used without TLS-RPT, so you get no reports when senders fail to deliver because of TLS problems. Publish _smtp._tls TXT "v=TLSRPTv1; rua=mailto:...".

#35
✓ DANE on all MX hosts #36

All 1 MX host publish DNSSEC-validated TLSA records.

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