Mail domain report: zeelandnet.nl

SPF

pass

SPF record published

Found

Record: v=spf1 include:_spf.dfn.nl include:_spf.megamail.nl -all
DNS lookups: 2 of 10
Void lookups: 0 of 2

Checks

✓ No deprecated ptr mechanism #1

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

SPF record needs 2 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.zeelandnet.nl)

Found

Record: v=DMARC1; p=none
Found at: _dmarc.zeelandnet.nl

Tag	Value	Meaning
v	DMARC1	Version
p	none	Policy

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.
!

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

DKIM

warn

Selectors: default, s1, s2

Found

Selectors: default, s1, s2
_domainkey: NOERROR

Selector	Key	Flags
default	RSA 2048 bits	h=sha256
s1	RSA 2048 bits
s2	RSA 1024 bits

Checks

✓ Keys found: default, s1, s2 #7

DKIM keys found for this domain with selectors: default, s1, s2
!

1024-bit DKIM key

1024-bit RSA keys are the minimum and are considered weak today: s2 (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: 10481
Signatures valid until: 29 October 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 2026-10-29 #21

DNSKEY signatures are valid until 2026-10-29T00:00:00Z.

MX

warn

4 mail servers

Found

Priority	Host	Records	Reverse DNS
10	mx1.zeelandnet.nl	A 217.102.255.210 A 217.102.255.219 A 217.102.255.212 A 217.102.255.207 A 217.102.255.218 A 217.102.255.205 A 217.102.255.215 A 217.102.255.223 A 217.102.255.206 A 217.102.255.214 A 217.102.255.208 A 217.102.255.213 A 217.102.255.211 A 217.102.255.221 A 217.102.255.216 A 217.102.255.217 A 217.102.255.220 A 217.102.255.222 A 217.102.255.209 A 217.102.255.224	spamfilter10.delta.nl ✓ spamfilter19.delta.nl ✓ spamfilter12.delta.nl ✓ spamfilter07.delta.nl ✓ spamfilter18.delta.nl ✓ spamfilter05.delta.nl ✓ spamfilter15.delta.nl ✓ spamfilter23.delta.nl ✓ spamfilter06.delta.nl ✓ spamfilter14.delta.nl ✓ spamfilter08.delta.nl ✓ spamfilter13.delta.nl ✓ spamfilter11.delta.nl ✓ spamfilter21.delta.nl ✓ spamfilter16.delta.nl ✓ spamfilter17.delta.nl ✓ spamfilter20.delta.nl ✓ spamfilter22.delta.nl ✓ spamfilter09.delta.nl ✓ spamfilter24.delta.nl ✓
20	mx2.zeelandnet.nl	A 217.102.255.235 A 217.102.255.225 A 217.102.255.226 A 217.102.255.236 A 217.102.255.227 A 217.102.255.233 A 217.102.255.228 A 217.102.255.234	spamfilter15.delta.nl (does not resolve back) spamfilter05.delta.nl (does not resolve back) spamfilter06.delta.nl (does not resolve back) spamfilter16.delta.nl (does not resolve back) spamfilter07.delta.nl (does not resolve back) spamfilter13.delta.nl (does not resolve back) spamfilter08.delta.nl (does not resolve back) spamfilter14.delta.nl (does not resolve back)
30	mx3.zeelandnet.nl	A 217.102.255.237 A 217.102.255.230 A 217.102.255.238 A 217.102.255.231 A 217.102.255.229 A 217.102.255.239 A 217.102.255.232 A 217.102.255.240	spamfilter17.delta.nl (does not resolve back) spamfilter10.delta.nl (does not resolve back) spamfilter18.delta.nl (does not resolve back) spamfilter11.delta.nl (does not resolve back) spamfilter09.delta.nl (does not resolve back) spamfilter19.delta.nl (does not resolve back) spamfilter12.delta.nl (does not resolve back) spamfilter20.delta.nl (does not resolve back)
40	mx4.zeelandnet.nl	A 217.102.255.225 A 217.102.255.251 A 217.102.255.231 A 217.102.255.246 A 217.102.255.227 A 217.102.255.229 A 217.102.255.247 A 217.102.255.245	spamfilter05.delta.nl (does not resolve back) spamfilter24.delta.nl (does not resolve back) spamfilter11.delta.nl (does not resolve back) spamfilter22.delta.nl (does not resolve back) spamfilter07.delta.nl (does not resolve back) spamfilter09.delta.nl (does not resolve back) spamfilter23.delta.nl (does not resolve back) spamfilter21.delta.nl (does not resolve back)

Checks

✓ 4 MX records #9

Found 4 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: mx1.zeelandnet.nl, mx2.zeelandnet.nl, mx3.zeelandnet.nl, mx4.zeelandnet.nl

#11
✓ 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 does not match

The PTR name of these addresses does not resolve back to the same address: 217.102.255.235 -> spamfilter15.delta.nl, 217.102.255.225 -> spamfilter05.delta.nl, 217.102.255.226 -> spamfilter06.delta.nl, 217.102.255.236 -> spamfilter16.delta.nl, 217.102.255.227 -> spamfilter07.delta.nl, 217.102.255.233 -> spamfilter13.delta.nl, 217.102.255.228 -> spamfilter08.delta.nl, 217.102.255.234 -> spamfilter14.delta.nl, 217.102.255.237 -> spamfilter17.delta.nl, 217.102.255.230 -> spamfilter10.delta.nl, 217.102.255.238 -> spamfilter18.delta.nl, 217.102.255.231 -> spamfilter11.delta.nl, 217.102.255.229 -> spamfilter09.delta.nl, 217.102.255.239 -> spamfilter19.delta.nl, 217.102.255.232 -> spamfilter12.delta.nl, 217.102.255.240 -> spamfilter20.delta.nl, 217.102.255.225 -> spamfilter05.delta.nl, 217.102.255.251 -> spamfilter24.delta.nl, 217.102.255.231 -> spamfilter11.delta.nl, 217.102.255.246 -> spamfilter22.delta.nl, 217.102.255.227 -> spamfilter07.delta.nl, 217.102.255.229 -> spamfilter09.delta.nl, 217.102.255.247 -> spamfilter23.delta.nl, 217.102.255.245 -> spamfilter21.delta.nl.

#30

TLS

info

no MTA-STS · no TLS-RPT · DANE on 0 of 4 MX hosts

Found

DANE (TLSA records)

MX host	TLSA	DNSSEC
mx1.zeelandnet.nl	none	-
mx2.zeelandnet.nl	none	-
mx3.zeelandnet.nl	none	-
mx4.zeelandnet.nl	none	-

Lookup error: DNS query for _mta-sts.zeelandnet.nl returned SERVFAIL

Checks

i

Could not be checked

The MTA-STS lookup failed, so this could not be checked: DNS query for _mta-sts.zeelandnet.nl returned SERVFAIL

#32
i

Could not be checked

The TLS-RPT lookup failed, so this could not be checked: DNS query for _smtp._tls.zeelandnet.nl returned SERVFAIL

#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

DNS query for default._bimi.zeelandnet.nl returned SERVFAIL

Checks

i

Could not be checked

The BIMI lookup failed, so this could not be checked: DNS query for default._bimi.zeelandnet.nl returned SERVFAIL

#38