dm.de

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

SPF

pass

SPF record published

Found

Record
v=spf1 include:spf.mailsecurity.dm.de -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.dm.de)

Found

Record
v=DMARC1; p=reject; adkim=s; aspf=s; rua=mailto:dmarc@mailsecurity.dm.de
Found at
_dmarc.dm.de
TagValueMeaning
vDMARC1Version
prejectPolicy
ruamailto:dmarc@mailsecurity.dm.deAggregate report addresses
adkimsDKIM alignment (r = relaxed, s = strict)
aspfsSPF alignment (r = relaxed, s = strict)

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@mailsecurity.dm.de
  • ✓ Subdomain policy: reject #20
    Subdomains are covered by policy 'reject'.
  • ✓ Report addresses in own domain #29
    All report addresses are in your own organizational domain.

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

4 mail servers

Found

PriorityHostRecordsReverse DNS
10mailgw1.dm.deA 194.127.216.50mailgw1.dm.de ✓
10mailgw2.dm.deA 194.127.216.51mailgw2.dm.de ✓
10mailgw3.dm.deA 194.127.216.61mailgw3.dm.de ✓
10mailgw4.dm.deA 194.127.216.62mailgw4.dm.de ✓

Checks

  • ✓ 4 MX records #9
    Found 4 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: mailgw1.dm.de, mailgw2.dm.de, mailgw3.dm.de, mailgw4.dm.de
    #11
  • ✓ Redundant MX hosts #12
    Found 4 MX records, which provides redundancy for email delivery.
  • ✓ At most 5 MX records #13
    Found 4 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

info

MTA-STS enforce · TLS-RPT · DANE on 0 of 4 MX hosts

Found

MTA-STS record
v=STSv1; id=20251104
Policy URL
https://mta-sts.dm.de/.well-known/mta-sts.txt
Mode
enforce
Allowed MX
mailgw1.dm.de, mailgw2.dm.de, mailgw3.dm.de, mailgw4.dm.de
Max age
604800 seconds
TLS-RPT record
v=TLSRPTv1; rua=mailto:mtasts@mailsecurity.dm.de

DANE (TLSA records)

MX hostTLSADNSSEC
mailgw1.dm.denone-
mailgw2.dm.denone-
mailgw3.dm.denone-
mailgw4.dm.denone-

Checks

  • ✓ Record published #32
    MTA-STS record found with id 20251104.
  • ✓ Policy enforced #33
    The MTA-STS policy is enforced and cached for 168h0m0s.
  • ✓ 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:mtasts@mailsecurity.dm.de
  • 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://assets.dm.de/mail-assets/dm-logo-mail.svg

Found

Record
v=BIMI1; l=https://assets.dm.de/mail-assets/dm-logo-mail.svg; a=https://assets.dm.de/mail-assets/dm-vmc.pem
Found at
default._bimi.dm.de
Logo
https://assets.dm.de/mail-assets/dm-logo-mail.svg
Certificate
https://assets.dm.de/mail-assets/dm-vmc.pem

Checks

  • ✓ Logo and certificate published #38
    BIMI logo: https://assets.dm.de/mail-assets/dm-logo-mail.svg; certificate: https://assets.dm.de/mail-assets/dm-vmc.pem
  • ✓ DMARC meets BIMI requirements #39
    DMARC is enforced on all mail, as BIMI requires.