Mail domain report: rcn.nl

SPF

pass

SPF record published

Found

Record: v=spf1 include:spf.protection.outlook.com include:spf.maxxton.com include:_spf.prodacom.net include:_spf.eu.mailgun.org include:spf.flowmailer.net include:spfa.rcn.nl ip4:188.204.210.98 -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

pass

p=reject (_dmarc.rcn.nl)

Found

Record: v=DMARC1; p=reject; rua=mailto:c0mordge@ag.eu.dmarcadvisor.com,mailto:dmarc@inbound.flowmailer.net; ruf=mailto:c0mordge@fr.eu.dmarcadvisor.com,mailto:dmarc@inbound.flowmailer.net; fo=1;
Found at: _dmarc.rcn.nl
External report address: mailto:c0mordge@ag.eu.dmarcadvisor.com (authorized)
External report address: mailto:dmarc@inbound.flowmailer.net (authorized)
External report address: mailto:c0mordge@fr.eu.dmarcadvisor.com (authorized)

Tag	Value	Meaning
v	DMARC1	Version
p	reject	Policy
rua	mailto:c0mordge@ag.eu.dmarcadvisor.com,mailto:dmarc@inbound.flowmailer.net	Aggregate report addresses
ruf	mailto:c0mordge@fr.eu.dmarcadvisor.com,mailto:dmarc@inbound.flowmailer.net	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:c0mordge@ag.eu.dmarcadvisor.com, mailto:dmarc@inbound.flowmailer.net
✓ 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: selector2

Found

Selectors: selector2
_domainkey: NOERROR

Selector	Key	Flags
selector2	RSA 1024 bits

Checks

✓ Keys found: selector2 #7

DKIM keys found for this domain with selectors: selector2
!

1024-bit DKIM key

1024-bit RSA keys are the minimum and are considered weak today: selector2 (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: 22599, 22089
Signatures valid until: 21 November 2026, 21:00 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 2026-11-21 #21

DNSKEY signatures are valid until 2026-11-21T21:00:09Z.

MX

warn

1 mail server

Found

Priority	Host	Records	Reverse DNS
10	rcn-nl.mail.protection.outlook.com	A 52.101.209.31 A 52.101.209.28 A 52.101.68.21 A 52.101.68.25 AAAA 2a01:111:f403:ca38::8 AAAA 2a01:111:f403:ca21::10 AAAA 2a01:111:f403:ca21::c AAAA 2a01:111:f403:c967::a	mail-cpjpr05cu00207.inbound.protection.outlook.com ✓ mail-cpjpr05cu00104.inbound.protection.outlook.com ✓ mail-db4pr02cu00205.inbound.protection.outlook.com ✓ mail-db8pr02cu00101.inbound.protection.outlook.com ✓ mail-wa4pr04cu00100.inbound.protection.outlook.com ✓ mail-matpr05cu00100.inbound.protection.outlook.com ✓ mail-matpr04cu00204.inbound.protection.outlook.com ✓ mail-cpjpr05cu00102.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 · TLS-RPT · DANE on 0 of 1 MX hosts

Found

TLS-RPT record: v=TLSRPTv1; rua=mailto:c0mordge@tls.eu.dmarcadvisor.com;

DANE (TLSA records)

MX host	TLSA	DNSSEC
rcn-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
✓ Reports enabled #35

TLS reports are sent to: mailto:c0mordge@tls.eu.dmarcadvisor.com
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

warn

https://rcnpubliek.blob.core.windows.net/images/logoRCN.svg

Found

Record: v=BIMI1; l=https://rcnpubliek.blob.core.windows.net/images/logoRCN.svg; a=;
Found at: default._bimi.rcn.nl
Logo: https://rcnpubliek.blob.core.windows.net/images/logoRCN.svg

Checks

!

No certificate (a=)

The logo is published without a Verified Mark Certificate. Gmail and Apple Mail only show BIMI logos with a VMC or CMC; Yahoo shows it without one.

#38
✓ DMARC meets BIMI requirements #39

DMARC is enforced on all mail, as BIMI requires.