Mail domain report: klinikum-stuttgart.de

SPF

pass

SPF record published

Found

Record: v=spf1 mx ip4:207.154.244.56 ip4:185.21.101.174 ip4:85.184.250.146 ip4:213.165.72.36 ip4:212.132.69.99 ip4:185.48.116.157 include:de._netblocks.mimecast.com -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

pass

p=reject (_dmarc.klinikum-stuttgart.de)

Found

Record: v=DMARC1; p=reject; adkim=r; aspf=r; rua=mailto:4ee1558e-7fb5-474a-b1c3-e28faac7a3b4@rep.de.mimecastdmarcanalyzer.com
Found at: _dmarc.klinikum-stuttgart.de
External report address: mailto:4ee1558e-7fb5-474a-b1c3-e28faac7a3b4@rep.de.mimecastdmarcanalyzer.com (authorized)

Tag	Value	Meaning
v	DMARC1	Version
p	reject	Policy
rua	mailto:4ee1558e-7fb5-474a-b1c3-e28faac7a3b4@rep.de.mimecastdmarcanalyzer.com	Aggregate report addresses
adkim	r	DKIM alignment (r = relaxed, s = strict)
aspf	r	SPF alignment (r = relaxed, s = strict)

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:4ee1558e-7fb5-474a-b1c3-e28faac7a3b4@rep.de.mimecastdmarcanalyzer.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

pass

Selectors: mail

Found

Selectors: mail
_domainkey: NOERROR

Selector	Key	Flags
mail	RSA 2048 bits

Checks

✓ Keys found: mail #7

DKIM keys found for this domain with selectors: mail
✓ Strong keys #23

DKIM keys are strong enough: mail: RSA 2048 bits.
✓ No problematic flags #24

No keys in test mode, revoked, or limited to SHA-1.

DNSSEC

warn

Signed, but no DS at parent

Found

DNSKEY records: Yes (1)
DS at parent: No
Algorithms: ECDSAP256SHA256 (13)
Key tags: 28631
Signatures valid until: 29 October 2026, 00:00 UTC

Checks

!

Signed, but no DS at parent

The zone is signed (DNSKEY present) but the parent has no DS record, so the chain of trust is incomplete. Publish the DS record at your registrar.

#8
✓ Signatures valid until 2026-10-29 #21

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

MX

warn

2 mail servers

Found

Priority	Host	Records	Reverse DNS
5	de-smtp-inbound-1.mimecast.com	A 194.104.110.22 A 194.104.108.22	de-smtp-inbound-1.mimecast.com ✓ de-smtp-inbound-2.mimecast.com ✓
5	de-smtp-inbound-2.mimecast.com	A 194.104.108.22 A 194.104.110.22	de-smtp-inbound-1.mimecast.com ✓ de-smtp-inbound-1.mimecast.com ✓

Checks

✓ 2 MX records #9

Found 2 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: de-smtp-inbound-1.mimecast.com, de-smtp-inbound-2.mimecast.com

#11
✓ 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 confirmed #30

All 4 MX addresss have a PTR record that resolves back to them.

TLS

warn

no MTA-STS · no TLS-RPT · DANE on 0 of 2 MX hosts

Found

DANE (TLSA records)

MX host	TLSA	DNSSEC
de-smtp-inbound-1.mimecast.com	none	-
de-smtp-inbound-2.mimecast.com	none	-

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
i

Not configured

TLS-RPT lets senders report TLS delivery problems to you. It is most useful together with MTA-STS or DANE.

#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

No BIMI record

Checks

i

Not configured

BIMI shows your logo next to your mail in supporting mail clients. It requires DMARC enforcement.

#38