Mail domain report: skepsis.nl

SPF

pass

SPF record published

Found

Record: v=spf1 include:_spf.yourfilter.nl ~all
DNS lookups: 5 of 10
Void lookups: 0 of 2

Checks

✓ No deprecated ptr mechanism #1

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

SPF record needs 5 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

fail

p=none (_dmarc.skepsis.nl)

Found

Record: v=DMARC1; p=none; rua=mailto:rua@dmarc.brevo.com
Found at: _dmarc.skepsis.nl
External report address: mailto:rua@dmarc.brevo.com (authorized)

Tag	Value	Meaning
v	DMARC1	Version
p	none	Policy
rua	mailto:rua@dmarc.brevo.com	Aggregate report addresses

Checks

✗

Policy: none (monitoring only)

DMARC policy is set to 'none', which only monitors but doesn't protect against spoofing. Consider upgrading to 'quarantine' or ideally 'reject'.

#4
✓ Record published #5

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

DMARC record syntax is valid.
✓ Aggregate reports enabled #19

Aggregate reports are sent to: mailto:rua@dmarc.brevo.com
✓ External report addresses authorized #29

Report addresses in other domains have published their authorization.

DKIM

warn

Selectors: default, mail

Found

Selectors: default, mail
_domainkey: NOERROR

Selector	Key	Flags
default	RSA 2048 bits
mail	RSA 1024 bits

Checks

✓ Keys found: default, mail #7

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

1024-bit DKIM key

1024-bit RSA keys are the minimum and are considered weak today: mail (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: RSASHA256 (8)
Key tags: 29454, 11317
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

pass

2 mail servers

Found

Priority	Host	Records	Reverse DNS
10	primary.yourfilter.nl	A 185.223.33.23 A 185.103.241.25 A 185.223.33.30 A 185.223.33.24 A 185.223.33.27 A 185.103.241.21 A 185.103.241.23 A 185.223.33.29 A 185.103.241.22 A 185.103.241.20 A 185.223.33.28 AAAA 2a01:b941:2::27 AAAA 2a01:b941:2::25 AAAA 2a05:1500:702:9:1c00:f0ff:fe00:5555 AAAA 2a01:b941:2::29 AAAA 2a01:b941:2::26 AAAA 2a01:b941:2::30 AAAA 2a05:1500:702:9:1c00:2aff:fe00:5554 AAAA 2a01:b941:2::24 AAAA 2a01:b941:2::23 AAAA 2a05:1500:702:9:1c00:a3ff:fe00:5558 AAAA 2a01:b941:2::28 AAAA 2a05:1500:702:9:1c00:7fff:fe00:5556 AAAA 2a05:1500:702:9:1c00:a5ff:fe00:5553	se23-yh.route25.eu ✓ se26-yh.route25.eu ✓ se16-yh.route25.eu ✓ se22-yh.route25.eu ✓ se19-yh.route25.eu ✓ se28-yh.route25.eu ✓ se30-yh.route25.eu ✓ se17-yh.route25.eu ✓ se29-yh.route25.eu ✓ se27-yh.route25.eu ✓ se18-yh.route25.eu ✓ se19-yh.route25.eu ✓ se21-yh.route25.eu ✓ se29-yh.route25.eu ✓ se17-yh.route25.eu ✓ se20-yh.route25.eu ✓ se16-yh.route25.eu ✓ se28-yh.route25.eu ✓ se22-yh.route25.eu ✓ se23-yh.route25.eu ✓ se26-yh.route25.eu ✓ se18-yh.route25.eu ✓ se30-yh.route25.eu ✓ se27-yh.route25.eu ✓
20	fallback.yourfilter.nl	A 185.223.33.27 A 185.223.33.30 A 185.223.33.25 A 185.103.241.23 A 185.223.33.23 A 185.223.33.26 A 185.103.241.22 AAAA 2a05:1500:702:9:1c00:7fff:fe00:5556 AAAA 2a01:b941:2::24 AAAA 2a01:b941:2::30 AAAA 2a01:b941:2::23 AAAA 2a05:1500:702:9:1c00:f0ff:fe00:5555 AAAA 2a01:b941:2::29 AAAA 2a01:b941:2::28	se19-yh.route25.eu ✓ se16-yh.route25.eu ✓ se21-yh.route25.eu ✓ se30-yh.route25.eu ✓ se23-yh.route25.eu ✓ se20-yh.route25.eu ✓ se29-yh.route25.eu ✓ se30-yh.route25.eu ✓ se22-yh.route25.eu ✓ se16-yh.route25.eu ✓ se23-yh.route25.eu ✓ se29-yh.route25.eu ✓ se17-yh.route25.eu ✓ se18-yh.route25.eu ✓

Checks

✓ 2 MX records #9

Found 2 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.
✓ Redundant MX hosts #12

Found 2 MX records, which provides redundancy for email delivery.
✓ At most 5 MX records #13

Found 2 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 38 MX addresss have a PTR record that resolves back to them.

TLS

warn

no MTA-STS · no TLS-RPT · DANE on 0 of 2 MX hosts

Found

DANE (TLSA records)

MX host	TLSA	DNSSEC
primary.yourfilter.nl	none	-
fallback.yourfilter.nl	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