Mail domain report: datev.de

SPF

pass

SPF record published

Found

Record: v=spf1 include:_spf.datev.de ~all
DNS lookups: 5 of 10
Void lookups: 0 of 2

Checks

✓ No deprecated ptr mechanism #1

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

SPF record needs 5 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.datev.de)

Found

Record: v=DMARC1;p=quarantine;rua=mailto:dmarc-a@reports.datev.de
Found at: _dmarc.datev.de

Tag	Value	Meaning
v	DMARC1	Version
p	quarantine	Policy
rua	mailto:dmarc-a@reports.datev.de	Aggregate report addresses

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:dmarc-a@reports.datev.de
✓ Subdomain policy: quarantine #20

Subdomains are covered by policy 'quarantine'.
✓ Report addresses in own domain #29

All report addresses are in your own organizational domain.

DKIM

warn

Selectors: s1, s2

Found

Selectors: s1, s2
_domainkey: NOERROR

Selector	Key	Flags
s1	RSA 2048 bits
s2	RSA 1024 bits

Checks

✓ Keys found: s1, s2 #7

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

1024-bit DKIM key

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

pass

Signed, DS published at parent

Found

DNSKEY records: Yes (1)
DS at parent: Yes
Algorithms: ECDSAP256SHA256 (13)
Key tags: 18297
Signatures valid until: 18 November 2026, 20:50 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 valid until 2026-11-18 #21

DNSKEY signatures are valid until 2026-11-18T20:50:25Z.

MX

pass

2 mail servers

Found

Priority	Host	Records	Reverse DNS
0	cdxmailin01.datev.de	A 193.27.49.208 AAAA 2a00:e50:f155:7::d0	cdxmailin01.datev.de ✓ cdxmailin01.datev.de ✓
0	cdxmailin02.datev.com	A 193.27.49.209 AAAA 2a00:e50:f155:7::d1	cdxmailin02.datev.com ✓ cdxmailin02.datev.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.
✓ All hosts have IPv6 #11

All MX records resolve to IPv6 addresses.
✓ 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

pass

MTA-STS enforce · TLS-RPT · DANE on 2 of 2 MX hosts

Found

MTA-STS record: v=STSv1; id=20220203090000Z;
Policy URL: https://mta-sts.datev.de/.well-known/mta-sts.txt
Mode: enforce
Allowed MX: cdxmailin01.datev.de, cdxmailin02.datev.com
Max age: 333333 seconds
TLS-RPT record: v=TLSRPTv1;rua=mailto:mta-sts@reports.datev.de

DANE (TLSA records)

MX host	TLSA	DNSSEC
cdxmailin01.datev.de	3 1 1 015306073eb61224… 3 1 1 7d0d2d62eae8013f…	Yes
cdxmailin02.datev.com	3 1 1 ea928ffa0ffe47fa… 3 1 1 1d879e44a00a0b6b…	Yes

Checks

✓ Record published #32

MTA-STS record found with id 20220203090000Z.
✓ Policy enforced #33

The MTA-STS policy is enforced and cached for 92h35m33s.
✓ 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:mta-sts@reports.datev.de
✓ DANE on all MX hosts #36

All 2 MX hosts publish DNSSEC-validated TLSA records.

BIMI

warn

https://postmaster.datev.de/images/datev.de.svg

Found

Record: v=BIMI1;l=https://postmaster.datev.de/images/datev.de.svg;a=;
Found at: default._bimi.datev.de
Logo: https://postmaster.datev.de/images/datev.de.svg

Checks

!

No certificate (a=)

The logo is published without a Verified Mark Certificate. Gmail and Apple Mail only show BIMI logos with a VMC or CMC; Yahoo shows it without one.

#38
✓ DMARC meets BIMI requirements #39

DMARC is enforced on all mail, as BIMI requires.