Mail domain report: markthal.nl

SPF

warn

SPF record published

Found

Record: v=spf1 a ip4:149.210.239.75 include:servers.mcsv.net include:mailgun.org include:spf.bwh.nl ~all
DNS lookups: 8 of 10
Void lookups: 1 of 2
Problem: include:spf.bwh.nl does not exist or has no records

Checks

✓ No deprecated ptr mechanism #1

No ptr mechanism found in SPF record.
!

8 of 10 DNS lookups, with problems

SPF record needs 8 DNS lookups (limit is 10). Problems found: include:spf.bwh.nl does not exist or has no records.

#2
✓ 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.
!

1 void lookup

1 include/redirect target does not exist or has no records (limit is 2). This usually is a stale include; remove it.

#26
✓ No overly broad IP ranges #27

All ip4/ip6 ranges are narrow enough.

DMARC

pass

p=reject (_dmarc.markthal.nl)

Found

Record: v=DMARC1; p=reject; rua=mailto:a0a53fce@in.mailhardener.com; ruf=mailto:a0a53fce@in.mailhardener.com
Found at: _dmarc.markthal.nl
External report address: mailto:a0a53fce@in.mailhardener.com (authorized)

Tag	Value	Meaning
v	DMARC1	Version
p	reject	Policy
rua	mailto:a0a53fce@in.mailhardener.com	Aggregate report addresses
ruf	mailto:a0a53fce@in.mailhardener.com	Failure report addresses

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:a0a53fce@in.mailhardener.com
✓ 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: 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 (1)
DS at parent: Yes
Algorithms: ECDSAP256SHA256 (13)
Key tags: 56913
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

warn

2 mail servers

Found

Priority	Host	Records	Reverse DNS
10	spool.mail.gandi.net	A 217.70.178.1 AAAA 2001:4b98:e00::1	spool.mail.gandi.net ✓ spool.mail.gandi.net ✓
50	fb.mail.gandi.net	A 217.70.178.216 A 217.70.178.215 A 217.70.178.217 AAAA 2001:4b98:dc4:8::216 AAAA 2001:4b98:dc4:8::215 AAAA 2001:4b98:dc4:8::217	spool7.mail.gandi.net ✓ spool6.mail.gandi.net ✓ spool8.mail.gandi.net ✓ spool7.mail.gandi.net (does not resolve back) spool6.mail.gandi.net (does not resolve back) spool8.mail.gandi.net (does not resolve back)

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 does not match

The PTR name of these addresses does not resolve back to the same address: 2001:4b98:dc4:8::216 -> spool7.mail.gandi.net, 2001:4b98:dc4:8::215 -> spool6.mail.gandi.net, 2001:4b98:dc4:8::217 -> spool8.mail.gandi.net.

#30

TLS

info

MTA-STS enforce · TLS-RPT · DANE on 0 of 2 MX hosts

Found

MTA-STS record: v=STSv1; id=20190601000000Z
Policy URL: https://mta-sts.markthal.nl/.well-known/mta-sts.txt
Mode: enforce
Allowed MX: spool.mail.gandi.net, fb.mail.gandi.net
Max age: 1209600 seconds
TLS-RPT record: v=TLSRPTv1; rua=mailto:a0a53fce@in.mailhardener.com

DANE (TLSA records)

MX host	TLSA	DNSSEC
spool.mail.gandi.net	none	-
fb.mail.gandi.net	none	-

Checks

✓ Record published #32

MTA-STS record found with id 20190601000000Z.
✓ Policy enforced #33

The MTA-STS policy is enforced and cached for 336h0m0s.
✓ All MX hosts covered #34

Every MX host matches an mx: line of the MTA-STS policy.
✓ Reports enabled #35

TLS reports are sent to: mailto:a0a53fce@in.mailhardener.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

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