Mail domain report: leiden.nl

SPF

pass

SPF record published

Found

Record: v=spf1 ip4:93.119.0.189 ip4:185.190.86.25 ip4:185.190.86.75 ip4:185.190.86.77 ip4:90.145.221.191 ip4:185.136.64.128/27 ip4:185.136.65.128/27 include:spf.eprov.nl include:spf.pinkprivate.cloud ip4:185.92.61.41 ip4:185.92.61.42 ip4:85.90.72.66 ip4:87.249.113.145 ip4:87.249.113.154 ip4:81.246.113.50 ip4:87.233.240.35 ip4:212.72.62.129/27 ip4:195.137.215.48 include:servers.mcsv.net include:_spf.easycruit.com include:spf.protection.outlook.com include:_spf.zivver.com include:_spf.mailplus.nl include:spf.topdesk.net ip4:185.136.64.10 ip4:185.136.64.11 ip4:185.136.65.10 ip4:185.136.65.11 ip4:87.233.198.3 ip6:2001:9a8:a6:0:87:233:198:3 ip4:87.233.230.114 ip6:2001:9a8:0:112:87:233:230:114 ip4:80.113.11.169 ip4:18.198.243.240 ip4:52.28.58.88 ip4:18.158.179.24 ip4:3.124.160.66 ip4:18.157.97.229 ip4:18.157.99.112 ip4:37.17.212.82 ip4:176.74.239.242 ip4:213.208.232.101 ip4:194.53.72.4 ip4:194.53.72.10 ip4:194.53.72.252 ip6:2001:4cb8:59c:1::25 ip6:2A07:CB84:3075:912:10:10:159:25 ip6:2A07:CB81:3711:815:10:10:160:25 ip4:94.232.164.10 ip4:132.164.22.143 ~all
DNS lookups: 8 of 10
Void lookups: 0 of 2

Checks

✓ No deprecated ptr mechanism #1

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

SPF record needs 8 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.leiden.nl)

Found

Record: v=DMARC1; p=quarantine; rua=mailto:epskklxd@ag.eu.dmarcadvisor.com,mailto:ewpi85jr@ag.eu.dmarcadvisor.com; ruf=mailto:epskklxd@ag.eu.dmarcadvisor.com,mailto:ewpi85jr@fr.eu.dmarcadvisor.com;fo=1;
Found at: _dmarc.leiden.nl
External report address: mailto:epskklxd@ag.eu.dmarcadvisor.com (authorized)
External report address: mailto:ewpi85jr@ag.eu.dmarcadvisor.com (authorized)
External report address: mailto:ewpi85jr@fr.eu.dmarcadvisor.com (authorized)

Tag	Value	Meaning
v	DMARC1	Version
p	quarantine	Policy
rua	mailto:epskklxd@ag.eu.dmarcadvisor.com,mailto:ewpi85jr@ag.eu.dmarcadvisor.com	Aggregate report addresses
ruf	mailto:epskklxd@ag.eu.dmarcadvisor.com,mailto:ewpi85jr@fr.eu.dmarcadvisor.com	Failure report addresses
fo	1	Failure reporting options

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.
✓ Aggregate reports enabled #19

Aggregate reports are sent to: mailto:epskklxd@ag.eu.dmarcadvisor.com, mailto:ewpi85jr@ag.eu.dmarcadvisor.com
✓ Subdomain policy: quarantine #20

Subdomains are covered by policy 'quarantine'.
✓ External report addresses authorized #29

Report addresses in other domains have published their authorization.

DKIM

warn

Selectors: selector1, selector2, s1, s2

Found

Selectors: selector1, selector2, s1, s2
_domainkey: NOERROR

Selector	Key	Flags
selector1	RSA 1024 bits
selector2	RSA 1024 bits
s1	RSA 2048 bits
s2	RSA 1024 bits

Checks

✓ Keys found: selector1, selector2, s1, s2 #7

DKIM keys found for this domain with selectors: selector1, selector2, s1, s2
!

1024-bit DKIM key

1024-bit RSA keys are the minimum and are considered weak today: selector1 (1024 bits), selector2 (1024 bits), 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

warn

Signed, DS published at parent

Found

DNSKEY records: Yes (4)
DS at parent: Yes
Algorithms: ECDSAP256SHA256 (13)
Key tags: 50885, 17681, 23205, 25283
Signatures valid until: 23 October 2026, 16:49 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 expire in 43h0m0s

DNSKEY signatures expire at 2026-10-23T16:49:58Z (in 43h0m0s). Check that re-signing works.

#21

MX

warn

1 mail server

Found

Priority	Host	Records	Reverse DNS
0	leiden-nl.x-v1.mx.microsoft	A 52.101.91.21 A 52.101.209.28 A 52.101.73.153 A 52.101.68.15 AAAA 2a01:111:f403:ca09::26 AAAA 2a01:111:f403:ca04::10 AAAA 2a01:111:f403:ca04::4 AAAA 2a01:111:f403:ca3c::a	mail-matpr05cu00105.inbound.protection.outlook.com ✓ mail-cpjpr05cu00104.inbound.protection.outlook.com ✓ mail-as8pr05cu00401.inbound.protection.outlook.com ✓ mail-db6pr03cu00107.inbound.protection.outlook.com ✓ mail-am8pr83cu00106.inbound.protection.outlook.com ✓ mail-dbapr03cu00100.inbound.protection.outlook.com ✓ mail-db4pr02cu00204.inbound.protection.outlook.com ✓ mail-zrxpr07cu00102.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 · no TLS-RPT · DANE on 1 of 1 MX hosts

Found

DANE (TLSA records)

MX host	TLSA	DNSSEC
leiden-nl.x-v1.mx.microsoft	2 0 1 c1ad7778796d20bc… 2 0 1 ea7a25255d111fc3… 3 1 1 cfd68bde4129c00a… 3 1 1 54883cc5f1849331… 3 1 1 803f7447cc75b208…	Yes

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
!

Not configured

MTA-STS or DANE is used without TLS-RPT, so you get no reports when senders fail to deliver because of TLS problems. Publish _smtp._tls TXT "v=TLSRPTv1; rua=mailto:...".

#35
✓ DANE on all MX hosts #36

All 1 MX host publish DNSSEC-validated TLSA records.

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