dhm.de

Checked 21 October 2026, 22:14 UTC · via 8.8.8.8
!Passed with warnings
30 passed 3 warnings 0 failed 1 info

SPF

pass

SPF record published

Found

Record
v=spf1 include:spf.mailsupport.dfn.de ip4:194.94.40.31 ip4:194.94.40.32 ip4:194.94.40.33 ip4:194.94.40.34 ~all
DNS lookups
1 of 10
Void lookups
0 of 2

Checks

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

Found

Record
v=DMARC1; p=reject; rua=mailto:67d690b0@in.mailhardener.com; ruf=mailto:67d690b0@in.mailhardener.com; fo=0:1:s
Found at
_dmarc.dhm.de
External report address
mailto:67d690b0@in.mailhardener.com (authorized)
TagValueMeaning
vDMARC1Version
prejectPolicy
ruamailto:67d690b0@in.mailhardener.comAggregate report addresses
rufmailto:67d690b0@in.mailhardener.comFailure report addresses
fo0:1:sFailure 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:67d690b0@in.mailhardener.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

warn

Selectors: mail

Found

Selectors
mail
_domainkey
NOERROR
SelectorKeyFlags
mailRSA 1024 bits

Checks

  • ✓ Keys found: mail #7
    DKIM keys found for this domain with selectors: mail
  • !
    1024-bit DKIM key
    1024-bit RSA keys are the minimum and are considered weak today: mail (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

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

3 mail servers

Found

PriorityHostRecordsReverse DNS
10a1761.mx.srv.dfn.deA 194.95.232.118a1761.mx.srv.dfn.de ✓
10b1761.mx.srv.dfn.deA 194.95.234.118b1761.mx.srv.dfn.de ✓
10c1761.mx.srv.dfn.deA 194.95.238.118c1761.mx.srv.dfn.de ✓

Checks

  • ✓ 3 MX records #9
    Found 3 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: a1761.mx.srv.dfn.de, b1761.mx.srv.dfn.de, c1761.mx.srv.dfn.de
    #11
  • ✓ Redundant MX hosts #12
    Found 3 MX records, which provides redundancy for email delivery.
  • ✓ At most 5 MX records #13
    Found 3 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 3 MX addresss have a PTR record that resolves back to them.

TLS

pass

MTA-STS enforce · TLS-RPT · DANE on 3 of 3 MX hosts

Found

MTA-STS record
v=STSv1; id=20190601000000Z
Policy URL
https://mta-sts.dhm.de/.well-known/mta-sts.txt
Mode
enforce
Allowed MX
a1761.mx.srv.dfn.de, b1761.mx.srv.dfn.de, c1761.mx.srv.dfn.de
Max age
1209600 seconds
TLS-RPT record
v=TLSRPTv1; rua=mailto:tlsrpt@in.mailhardener.com

DANE (TLSA records)

MX hostTLSADNSSEC
a1761.mx.srv.dfn.de3 0 1 9bec67f55f2afdb7…Yes
b1761.mx.srv.dfn.de3 0 1 9bec67f55f2afdb7…Yes
c1761.mx.srv.dfn.de3 0 1 9bec67f55f2afdb7…Yes

Checks

  • ✓ Record published #32
    MTA-STS record found with id 20190601000000Z.
  • ✓ Policy enforced #33
    The MTA-STS policy is enforced and cached for 336h0m0s.
  • ✓ 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:tlsrpt@in.mailhardener.com
  • ✓ DANE on all MX hosts #36
    All 3 MX hosts publish DNSSEC-validated TLSA records.

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