thieme.de

Checked 22 October 2026, 00:40 UTC · via 8.8.8.8
✗Problems found
24 passed 7 warnings 1 failed 1 info

SPF

pass

SPF record published

Found

Record
v=spf1 mx include:_spf.thieme.de -all exp=_spf_explain.thieme.de
DNS lookups
3 of 10
Void lookups
0 of 2

Checks

  • ✓ No deprecated ptr mechanism #1
    No ptr mechanism found in SPF record.
  • ✓ 3 of 10 DNS lookups #2
    SPF record needs 3 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.thieme.de)

Found

Record
v=DMARC1; p=quarantine; rua=mailto:2c5825ba56ea970@rep.dmarcanalyzer.com; sp=none;
Found at
_dmarc.thieme.de
External report address
mailto:2c5825ba56ea970@rep.dmarcanalyzer.com (authorized)
TagValueMeaning
vDMARC1Version
pquarantinePolicy
spnoneSubdomain policy
ruamailto:2c5825ba56ea970@rep.dmarcanalyzer.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:2c5825ba56ea970@rep.dmarcanalyzer.com
  • !
    Subdomains unprotected (sp=none)
    DMARC subdomain policy is sp=none, so spoofed mail from subdomains is not blocked. Consider sp=quarantine or sp=reject.
    #20
  • ✓ External report addresses authorized #29
    Report addresses in other domains have published their authorization.

DKIM

warn

No keys found under the checked selectors

Found

Selectors
None found
_domainkey
NOERROR

Checks

  • !
    No key under common selectors
    The _domainkey name exists but no DKIM key was found under the common selectors. Selectors are provider-specific; check yours with -selector.
    #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

6 mail servers

Found

PriorityHostRecordsReverse DNS
10mxa.thieme.deA 91.208.107.65mxa.thieme.de ✓
10mxb.thieme.deA 91.208.107.53mxb.thieme.de ✓
60mxc.thieme.deA 91.208.107.40mxc.thieme.de ✓
60mxd.thieme.deA 91.208.107.50mxd.thieme.de ✓
80mxe.thieme.deA 91.208.107.60mxe.thieme.de ✓
80mxf.thieme.deA 91.208.107.88mxf.thieme.de ✓

Checks

  • ✓ 6 MX records #9
    Found 6 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: mxa.thieme.de, mxb.thieme.de, mxc.thieme.de, mxd.thieme.de, mxe.thieme.de, mxf.thieme.de
    #11
  • ✓ Redundant MX hosts #12
    Found 6 MX records, which provides redundancy for email delivery.
  • !
    More than 5 MX records
    Found 6 MX records, which is more than the recommended maximum of 5. Too many MX records may indicate a misconfiguration.
    #13
  • ✓ 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 6 MX addresss have a PTR record that resolves back to them.

TLS

info

MTA-STS enforce · TLS-RPT · DANE on 0 of 6 MX hosts

Found

MTA-STS record
v=STSv1; id=1672845864
Policy URL
https://mta-sts.thieme.de/.well-known/mta-sts.txt
Mode
enforce
Allowed MX
mxa.thieme.de, mxc.thieme.de, mxf.thieme.de, mxe.thieme.de, mxb.thieme.de, mxd.thieme.de, mx.thieme.de
Max age
86400 seconds
TLS-RPT record
v=TLSRPTv1; rua=mailto:a24ea27579b9.m@dmarcinput.com

DANE (TLSA records)

MX hostTLSADNSSEC
mxa.thieme.denone-
mxb.thieme.denone-
mxc.thieme.denone-
mxd.thieme.denone-
mxe.thieme.denone-
mxf.thieme.denone-

Checks

  • ✓ Record published #32
    MTA-STS record found with id 1672845864.
  • ✓ Policy enforced #33
    The MTA-STS policy is enforced and cached for 24h0m0s.
  • ✓ 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:a24ea27579b9.m@dmarcinput.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

fail

https://cdn.thieme.de/mail/thieme_bimi.svg

Found

Record
v=BIMI1; l=https://cdn.thieme.de/mail/thieme_bimi.svg
Found at
default._bimi.thieme.de
Logo
https://cdn.thieme.de/mail/thieme_bimi.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 not strict enough for BIMI
    Mail clients will not show the logo. BIMI requires a subdomain policy other than sp=none.
    #39