Mail domain report: oostnl.nl

SPF

pass

SPF record published

Found

Record: v=spf1 include:spf.ess.de.barracudanetworks.com include:eur.pb-dynmktge.com ip4:64.225.67.133/32 ip4:194.104.108.22 ip4:185.31.244.236 ip4:217.114.99.187 ip4:217.114.99.177 ip4:85.17.68.46 ip4:5.226.149.176 ip4:217.114.99.37 a:mailrelay.nubium.nl include:spf.protection.outlook.com include:_spf.elonisas.nl include:spf.virtu.nl include:spf.afas.online include:_spf.benp.nl include:amazonses.com -all
DNS lookups: 9 of 10
Void lookups: 0 of 2

Checks

✓ No deprecated ptr mechanism #1

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

SPF record needs 9 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.oostnl.nl)

Found

Record: v=DMARC1; p=none; sp=none; rua=mailto:watchdog2@watchdog.kevlarr.io; adkim=r; aspf=r;
Found at: _dmarc.oostnl.nl
External report address: mailto:watchdog2@watchdog.kevlarr.io (authorized)

Tag	Value	Meaning
v	DMARC1	Version
p	none	Policy
sp	none	Subdomain policy
rua	mailto:watchdog2@watchdog.kevlarr.io	Aggregate report addresses
adkim	r	DKIM alignment (r = relaxed, s = strict)
aspf	r	SPF alignment (r = relaxed, s = strict)

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:watchdog2@watchdog.kevlarr.io
✓ External report addresses authorized #29

Report addresses in other domains have published their authorization.

DKIM

warn

Selectors: selector1, mx

Found

Selectors: selector1, mx
_domainkey: NOERROR

Selector	Key	Flags
selector1	RSA 1024 bits
mx	RSA 2048 bits	h=sha256

Checks

✓ Keys found: selector1, mx #7

DKIM keys found for this domain with selectors: selector1, mx
!

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

pass

Signed, DS published at parent

Found

DNSKEY records: Yes (2)
DS at parent: Yes
Algorithms: RSASHA256 (8)
Key tags: 9709, 32059
Signatures valid until: 19 January 2027, 03:48 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 2027-01-19 #21

DNSKEY signatures are valid until 2027-01-19T03:48:28Z.

MX

warn

2 mail servers

Found

Priority	Host	Records	Reverse DNS
40	d341266.a.ess.de.barracudanetworks.com	A 18.185.115.251 A 18.185.115.250 A 18.185.115.252	mail.ess.de.barracuda.com ✓ mail.ess.de.barracuda.com ✓ mail.ess.de.barracuda.com ✓
50	d341266.b.ess.de.barracudanetworks.com	A 18.185.115.252 A 18.185.115.251 A 18.185.115.250	mail.ess.de.barracuda.com ✓ mail.ess.de.barracuda.com ✓ mail.ess.de.barracuda.com ✓

Checks

✓ 2 MX records #9

Found 2 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: d341266.a.ess.de.barracudanetworks.com, d341266.b.ess.de.barracudanetworks.com

#11
✓ 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 6 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
d341266.a.ess.de.barracudanetworks.com	none	-
d341266.b.ess.de.barracudanetworks.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