barmer.de

Checked 21 October 2026, 21:35 UTC · via 8.8.8.8
✗Problems found
24 passed 4 warnings 1 failed 2 info

SPF

pass

SPF record published

Found

Record
v=spf1 mx a:spf-issbh.mas.t-systems-service.com a:smtp.bitsystems-gmbh.de ip4:185.172.11.154 ip4:35.242.247.107 ip4:34.107.8.58 ip4:62.146.198.45 include:_spf-dc55.sapsf.eu include:spf.protection.outlook.com -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.barmer.de)

Found

Record
v=DMARC1;p=quarantine;pct=100;rua=mailto:dmarc@poc.mas.t-systems-service.com;
Found at
_dmarc.barmer.de
External report address
mailto:dmarc@poc.mas.t-systems-service.com (authorized)
TagValueMeaning
vDMARC1Version
pquarantinePolicy
pct100Percentage of mail the policy applies to
ruamailto:dmarc@poc.mas.t-systems-service.comAggregate 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@poc.mas.t-systems-service.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

fail

No keys found under the checked selectors

Found

Selectors
None found
_domainkey
NXDOMAIN

Checks

  • ✗
    No DKIM keys published
    _domainkey.barmer.de does not exist (NXDOMAIN), so no DKIM keys are published. DKIM helps prevent email spoofing. Configure DKIM with your email service provider.
    #7

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

PriorityHostRecordsReverse DNS
10issbh-smtp01.mas.t-systems-service.comA 160.44.10.50issbh-smtp01.mas.t-systems-service.com ✓
10issbh-smtp02.mas.t-systems-service.comA 160.44.10.51issbh-smtp02.mas.t-systems-service.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: issbh-smtp01.mas.t-systems-service.com, issbh-smtp02.mas.t-systems-service.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 2 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 hostTLSADNSSEC
issbh-smtp01.mas.t-systems-service.comnone-
issbh-smtp02.mas.t-systems-service.comnone-

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

pass

https://d21sxmralk0xsq.cloudfront.net/order_1505553039_logo.svg

Found

Record
v=BIMI1;l=https://d21sxmralk0xsq.cloudfront.net/order_1505553039_logo.svg;a=https://d21sxmralk0xsq.cloudfront.net/barmer.pem;avp=brand;
Found at
default._bimi.barmer.de
Logo
https://d21sxmralk0xsq.cloudfront.net/order_1505553039_logo.svg
Certificate
https://d21sxmralk0xsq.cloudfront.net/barmer.pem

Checks

  • ✓ Logo and certificate published #38
    BIMI logo: https://d21sxmralk0xsq.cloudfront.net/order_1505553039_logo.svg; certificate: https://d21sxmralk0xsq.cloudfront.net/barmer.pem
  • ✓ DMARC meets BIMI requirements #39
    DMARC is enforced on all mail, as BIMI requires.