Mail domain report: s-bahn-berlin.de

SPF

pass

SPF record published

Found

Record: v=spf1 mx a:wh01.yco.de a:mail.abo-antrag.de ip4:194.126.239.3 ip4:93.92.132.173/32 ip4:81.200.198.240/28 ip4:93.92.135.240/28 ip4:93.92.133.224/28 ip4:93.92.132.160/28 ip4:87.118.116.204/32 ip4:87.118.117.204/32 ip4:81.200.196.41/32 include:_spf.senders.scnem.com include:amazonses.com include:spf.protection.outlook.com -all
DNS lookups: 6 of 10
Void lookups: 0 of 2

Checks

✓ No deprecated ptr mechanism #1

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

SPF record needs 6 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.s-bahn-berlin.de)

Found

Record: v=DMARC1; p=reject; rua=mailto:dmarc.reporting@deutschebahn.com; ruf=mailto:dmarc.reporting@deutschebahn.com; fo=1; adkim=r; aspf=r
Found at: _dmarc.s-bahn-berlin.de
External report address: mailto:dmarc.reporting@deutschebahn.com (authorized)

Tag	Value	Meaning
v	DMARC1	Version
p	reject	Policy
rua	mailto:dmarc.reporting@deutschebahn.com	Aggregate report addresses
ruf	mailto:dmarc.reporting@deutschebahn.com	Failure report addresses
adkim	r	DKIM alignment (r = relaxed, s = strict)
aspf	r	SPF alignment (r = relaxed, s = strict)
fo	1	Failure reporting options

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:dmarc.reporting@deutschebahn.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: selector1

Found

Selectors: selector1
_domainkey: NXDOMAIN

Selector	Key	Flags
selector1	RSA 2048 bits

Checks

✓ Keys found: selector1 #7

DKIM keys found for this domain with selectors: selector1
✓ Strong keys #23

DKIM keys are strong enough: selector1: RSA 2048 bits.
✓ 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

2 mail servers

Found

Priority	Host	Records	Reverse DNS
10	mail2.sbahn.berlin	A 45.139.158.233	mail2.sbahn.berlin ✓
50	mail.abo-antrag.de	A 45.139.158.233	mail2.sbahn.berlin ✓

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: mail2.sbahn.berlin, mail.abo-antrag.de

#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 2 MX addresss have a PTR record that resolves back to them.

TLS

fail

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

Found

MTA-STS record: v=STSv1; id=20230712120000Z;
Policy URL: https://mta-sts.s-bahn-berlin.de/.well-known/mta-sts.txt
Mode: enforce
Allowed MX: *.mail.protection.outlook.com
Max age: 604800 seconds

DANE (TLSA records)

MX host	TLSA	DNSSEC
mail2.sbahn.berlin	none	-
mail.abo-antrag.de	none	-

Checks

✓ Record published #32

MTA-STS record found with id 20230712120000Z.
✓ Policy enforced #33

The MTA-STS policy is enforced and cached for 168h0m0s.
✗

MX hosts missing from policy

These MX hosts are not listed in the MTA-STS policy (mx: *.mail.protection.outlook.com): mail2.sbahn.berlin, mail.abo-antrag.de. Senders that enforce MTA-STS will refuse to deliver to them.

#34
!

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
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