herrenberg.de

Checked 21 October 2026, 22:50 UTC · via 8.8.8.8
!Passed with warnings
23 passed 5 warnings 0 failed 3 info

SPF

pass

SPF record published

Found

Record
v=spf1 ip4:84.246.120.160 ip4:134.119.0.30 ip4:195.243.76.130 ip4:134.119.86.148 ip4:195.189.93.165 ip4:195.189.93.166 ip4:185.15.192.56 ip6:2a00:1158:400:407::594 ip6:2a00:116a:104:9210:0:0:0:0 ip4:134.119.0.41 ip4:134.119.228.53 ip4:185.15.192.57 ip4:185.224.154.50 ip4:37.202.1.53 ip4:84.246.120.140 include:spf.protect.kvnbw.de include:_spf.xurrent.com include:agenturserver.de include:spf.brevo.com include:indivsurvey.de -all
DNS lookups
7 of 10
Void lookups
0 of 2

Checks

  • ✓ No deprecated ptr mechanism #1
    No ptr mechanism found in SPF record.
  • ✓ 7 of 10 DNS lookups #2
    SPF record needs 7 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=reject (_dmarc.herrenberg.de)

Found

Record
v=DMARC1; p=reject; pct=100; fo=1; aspf=r; adkim=r
Found at
_dmarc.herrenberg.de
TagValueMeaning
vDMARC1Version
prejectPolicy
pct100Percentage of mail the policy applies to
adkimrDKIM alignment (r = relaxed, s = strict)
aspfrSPF alignment (r = relaxed, s = strict)
fo1Failure 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.
  • !
    No aggregate reports (rua)
    DMARC record has no rua tag, so you receive no aggregate reports about who sends mail as your domain. Add rua=mailto:...
    #19
  • ✓ Subdomain policy: reject #20
    Subdomains are covered by policy 'reject'.

DKIM

warn

Selectors: default, mail

Found

Selectors
default, mail
_domainkey
NOERROR
SelectorKeyFlags
defaultRSA 2048 bits
mailRSA 1024 bits

Checks

  • ✓ Keys found: default, mail #7
    DKIM keys found for this domain with selectors: default, 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

4 mail servers

Found

PriorityHostRecordsReverse DNS
1mx6.kvnbw.deA 194.0.94.48mx6.kvnbw.de ✓
1mx7.kvnbw.deA 194.0.94.49mx7.kvnbw.de ✓
1mx8.kvnbw.deA 194.59.36.34mx8.kvnbw.de ✓
1mx9.kvnbw.deA 194.59.36.35mx9.kvnbw.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: mx6.kvnbw.de, mx7.kvnbw.de, mx8.kvnbw.de, mx9.kvnbw.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

warn

no MTA-STS · no TLS-RPT · DANE on 0 of 4 MX hosts

Found

DANE (TLSA records)

MX hostTLSADNSSEC
mx6.kvnbw.denone-
mx7.kvnbw.denone-
mx8.kvnbw.denone-
mx9.kvnbw.denone-

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

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