Mail domain report: sibon.nl

SPF

pass

SPF record published

Found

Record: v=spf1 include:mailfilter.myrootnet.nl ip4:81.172.171.208 include:spf.xcellerate.net include:spf.protection.outlook.com include:servers.mcsv.net include:spf.antispamcloud.com ~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

warn

p=quarantine (_dmarc.sibon.nl)

Found

Record: v=DMARC1; p=quarantine; sp=reject;
Found at: _dmarc.sibon.nl

Tag	Value	Meaning
v	DMARC1	Version
p	quarantine	Policy
sp	reject	Subdomain policy

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: reject #20

Subdomains are covered by policy 'reject'.

DKIM

warn

Selectors: k1

Found

Selectors: k1
_domainkey: NOERROR

Selector	Key	Flags
k1	RSA 1024 bits

Checks

✓ Keys found: k1 #7

DKIM keys found for this domain with selectors: 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 (1)
DS at parent: Yes
Algorithms: ECDSAP256SHA256 (13)
Key tags: 41042
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

4 mail servers

Found

Priority	Host	Records	Reverse DNS
10	mx1.3ict.email	A 154.59.193.124 AAAA 2001:978:2:6::f:124	fe3-r3-in.du01.l.antispamcloud.com ✓ fe3-r3-in.du01.l.antispamcloud.com ✓
20	mx2.3ict.email	A 149.13.75.27 AAAA 2001:978:2:7::162:100	fe1-r3-in.fra02.l.antispamcloud.com ✓ fe1-r3-in.fra02.l.antispamcloud.com ✓
30	mx3.3ict.email	A 154.59.104.23 AAAA 2001:978:2:2c::137:100	fe2-r3-in.ams14.l.antispamcloud.com ✓ fe2-r3-in.ams14.l.antispamcloud.com ✓
40	mx4.3ict.email	A 154.59.193.124 AAAA 2001:978:2:6::f:124	fe3-r3-in.du01.l.antispamcloud.com ✓ fe3-r3-in.du01.l.antispamcloud.com ✓

Checks

✓ 4 MX records #9

Found 4 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 4 MX records, which provides redundancy for email delivery.
✓ At most 5 MX records #13

Found 4 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 4 MX hosts

Found

DANE (TLSA records)

MX host	TLSA	DNSSEC
mx1.3ict.email	none	-
mx2.3ict.email	none	-
mx3.3ict.email	none	-
mx4.3ict.email	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