Mail domain report: hartstichting.nl

SPF

warn

SPF record published

Found

Record: v=spf1 redirect=_sph2khs0q.sdmarc.net
DNS lookups: 4 of 10
Void lookups: 0 of 2
Problem: include:_sph2khs0q2.sdmarc.net could not be resolved: DNS query for _sph2khs0q2.sdmarc.net failed: read udp 46.225.38.91:33797->8.8.8.8:53: i/o timeout

Checks

✓ No deprecated ptr mechanism #1

No ptr mechanism found in SPF record.
!

4 of 10 DNS lookups, with problems

SPF record needs 4 DNS lookups (limit is 10). Problems found: include:_sph2khs0q2.sdmarc.net could not be resolved: DNS query for _sph2khs0q2.sdmarc.net failed: read udp 46.225.38.91:33797->8.8.8.8:53: i/o timeout.

#2
i

Delegated via redirect

SPF record has no 'all' mechanism but redirects to _sph2khs0q.sdmarc.net, whose policy applies.

#3
✓ 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.hartstichting.nl)

Found

Record: v=DMARC1; p=reject; ri=604800; rua=mailto:a.ph2khs0q@sdmarc.net; adkim=r; aspf=r
Found at: _dmarc.hartstichting.nl
External report address: mailto:a.ph2khs0q@sdmarc.net (authorized)

Tag	Value	Meaning
v	DMARC1	Version
p	reject	Policy
rua	mailto:a.ph2khs0q@sdmarc.net	Aggregate report addresses
adkim	r	DKIM alignment (r = relaxed, s = strict)
aspf	r	SPF alignment (r = relaxed, s = strict)
ri	604800	Report interval (seconds)

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:a.ph2khs0q@sdmarc.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: mail, selector2, s1, s2

Found

Selectors: mail, selector2, s1, s2
_domainkey: NOERROR

Selector	Key	Flags
mail	RSA 1024 bits
selector2	RSA 2048 bits
s1	RSA 2048 bits
s2	RSA 2048 bits

Checks

✓ Keys found: mail, selector2, s1, s2 #7

DKIM keys found for this domain with selectors: mail, selector2, s1, s2
!

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

info

DNS query for hartstichting.nl failed: read udp 46.225.38.91:38199->8.8.8.8:53: i/o timeout

Checks

i

Could not be checked

The DNSSEC lookup failed, so this could not be checked: DNS query for hartstichting.nl failed: read udp 46.225.38.91:38199->8.8.8.8:53: i/o timeout

#8

MX

warn

1 mail server

Found

Priority	Host	Records	Reverse DNS
0	hartstichting-nl.mail.protection.outlook.com	A 52.101.103.137 A 52.101.209.153 A 52.101.103.39 A 52.101.68.27 AAAA 2a01:111:f403:ca09::20 AAAA 2a01:111:f403:ca09::22 AAAA 2a01:111:f403:ca21::8 AAAA 2a01:111:f403:ca3c::8	mail-miypr02cu00101.inbound.protection.outlook.com ✓ lookup failed mail-miypr05cu00207.inbound.protection.outlook.com (does not resolve back) mail-db7pr03cu00503.inbound.protection.outlook.com ✓ lookup failed mail-am7pr02cu00302.inbound.protection.outlook.com ✓ mail-matpr04cu00100.inbound.protection.outlook.com ✓ mail-zrxpr05cu00100.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 does not match

The PTR name of these addresses does not resolve back to the same address: 52.101.103.39 -> mail-miypr05cu00207.inbound.protection.outlook.com.

#30

TLS

warn

MTA-STS testing · TLS-RPT · DANE on 0 of 1 MX hosts (lookup failed for 1)

Found

MTA-STS record: v=STSv1; id=1719249992
Policy URL: https://mta-sts.hartstichting.nl/.well-known/mta-sts.txt
Mode: testing
Allowed MX: hartstichting-nl.mail.protection.outlook.com
Max age: 604800 seconds
TLS-RPT record: v=TLSRPTv1; rua=mailto:reports@sendmarc.net

DANE (TLSA records)

MX host	TLSA	DNSSEC
hartstichting-nl.mail.protection.outlook.com	DNS query for _25._tcp.hartstichting-nl.mail.protection.outlook.com failed: read udp 46.225.38.91:59796->8.8.8.8:53: i/o timeout	-

Checks

✓ Record published #32

MTA-STS record found with id 1719249992.
!

Policy in testing mode

With mode: testing, senders only report TLS problems (via TLS-RPT) and still deliver without TLS. Switch to mode: enforce once reports are clean.

#33
✓ 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:reports@sendmarc.net
i

Could not be checked

The TLSA lookup failed for: hartstichting-nl.mail.protection.outlook.com (DNS query for _25._tcp.hartstichting-nl.mail.protection.outlook.com failed: read udp 46.225.38.91:59796->8.8.8.8:53: i/o timeout).

#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