Mail domain report: kolping.de

SPF

fail

SPF record published

Found

Record: v=spf1 mx include:spf.protection.outlook.com include:_spf.jpberlin.de ip4:93.89.4.172 a:shop02.rackspeed-cloud.de a:shop03.rackspeed-cloud.de a:dedi5573.your-server.de include:oracleindustry.com include:_spf.zimpel.de ~all
DNS lookups: 18 of 10
Void lookups: 0 of 2

Checks

✓ No deprecated ptr mechanism #1

No ptr mechanism found in SPF record.
✗

18 DNS lookups, over the limit of 10

SPF record needs 18 DNS lookups (including nested includes), more than the limit of 10. Receivers will return a permerror; reduce includes or flatten the record.

#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.
✓ 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.kolping.de)

Found

Record: v=DMARC1; p=quarantine; pct=100; rua=mailto:68fee730@in.mailhardener.com; aspf=r; adkim=r; ruf=mailto:68fee730@in.mailhardener.com
Found at: _dmarc.kolping.de
External report address: mailto:68fee730@in.mailhardener.com (authorized)

Tag	Value	Meaning
v	DMARC1	Version
p	quarantine	Policy
pct	100	Percentage of mail the policy applies to
rua	mailto:68fee730@in.mailhardener.com	Aggregate report addresses
ruf	mailto:68fee730@in.mailhardener.com	Failure report addresses
adkim	r	DKIM alignment (r = relaxed, s = strict)
aspf	r	SPF alignment (r = relaxed, s = strict)

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:68fee730@in.mailhardener.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: default, selector1

Found

Selectors: default, selector1
_domainkey: NOERROR

Selector	Key	Flags
default	RSA 1024 bits
selector1	RSA 2048 bits

Checks

✓ Keys found: default, selector1 #7

DKIM keys found for this domain with selectors: default, selector1
!

1024-bit DKIM key

1024-bit RSA keys are the minimum and are considered weak today: default (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

Not signed

Found

DNSKEY records: No (0)
DS at parent: No

Checks

!

Not enabled

DNSSEC is not enabled for this domain. Consider enabling DNSSEC to protect against DNS spoofing attacks.

#8

MX

warn

3 mail servers

Found

Priority	Host	Records	Reverse DNS
10	kolping-de.mail.protection.outlook.com	A 52.101.68.29 A 52.101.185.114 A 52.101.68.25 A 52.101.73.155 AAAA 2a01:111:f403:ca48::a AAAA 2a01:111:f403:ca21::a AAAA 2a01:111:f403:ca3c::6 AAAA 2a01:111:f403:ca21::e	mail-dbapr03cu00105.inbound.protection.outlook.com ✓ mail-zrxpr04cu00102.inbound.protection.outlook.com ✓ mail-db8pr02cu00101.inbound.protection.outlook.com ✓ mail-am7pr02cu00203.inbound.protection.outlook.com ✓ mail-miypr02cu00202.inbound.protection.outlook.com ✓ mail-maspr04cu00102.inbound.protection.outlook.com ✓ mail-zrxpr04cu00106.inbound.protection.outlook.com ✓ mail-matpr04cu00306.inbound.protection.outlook.com ✓
20	mailout.kolping.de	A 84.245.141.137	mailout.kolping.de ✓
50	mail3.kolping.de	A 62.112.72.54	mail3.kolping.de ✓

Checks

✓ 3 MX records #9

Found 3 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: mailout.kolping.de, mail3.kolping.de

#11
✓ Redundant MX hosts #12

Found 3 MX records, which provides redundancy for email delivery.
✓ At most 5 MX records #13

Found 3 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 10 MX addresss have a PTR record that resolves back to them.

TLS

warn

MTA-STS testing · TLS-RPT · DANE on 0 of 3 MX hosts

Found

MTA-STS record: v=STSv1; id=20260923150653
Policy URL: https://mta-sts.kolping.de/.well-known/mta-sts.txt
Mode: testing
Allowed MX: kolping-de.mail.protection.outlook.com, mailout.kolping.de, mail3.kolping.de
Max age: 1209600 seconds
TLS-RPT record: v=TLSRPTv1; rua=mailto:68fee730@in.mailhardener.com

DANE (TLSA records)

MX host	TLSA	DNSSEC
kolping-de.mail.protection.outlook.com	none	-
mailout.kolping.de	none	-
mail3.kolping.de	none	-

Checks

✓ Record published #32

MTA-STS record found with id 20260923150653.
!

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:68fee730@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