koelntourismus.de

Checked 21 October 2026, 23:10 UTC · via 8.8.8.8
!Passed with warnings
24 passed 5 warnings 0 failed 1 info

SPF

pass

SPF record published

Found

Record
v=spf1 include:spf.mailjet.com include:spf.codepiraten.com include:smtp.neusta-is.de include:maildomain._spf.datev.de ip4:213.168.65.134 include:_spf.sendnode.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=reject (_dmarc.koelntourismus.de)

Found

Record
v=DMARC1; p=reject; sp=quarantine; rua=mailto:mail-reports@codepiraten.com
Found at
_dmarc.koelntourismus.de
External report address
mailto:mail-reports@codepiraten.com (not authorized)
TagValueMeaning
vDMARC1Version
prejectPolicy
spquarantineSubdomain policy
ruamailto:mail-reports@codepiraten.comAggregate report addresses

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:mail-reports@codepiraten.com
  • ✓ Subdomain policy: quarantine #20
    Subdomains are covered by policy 'quarantine'.
  • !
    Report address not authorized
    These report addresses are in another domain that has not agreed to receive your reports, so receivers will not send them: mailto:mail-reports@codepiraten.com (needs koelntourismus.de._report._dmarc.codepiraten.com). Ask the report provider to publish the record, or check the address.
    #29

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

pass

2 mail servers

Found

PriorityHostRecordsReverse DNS
10maildomain.datevnet.deA 193.27.49.220 A 193.27.49.206 AAAA 2a00:e50:f155:7::dc AAAA 2a00:e50:f155:7::cemaildomain.datevnet.de ✓ maildomain.datevnet.de ✓ maildomain.datevnet.de ✓ maildomain.datevnet.de ✓
20maildomain.datevnet.comA 193.27.49.221 A 193.27.49.207 AAAA 2a00:e50:f155:7::cf AAAA 2a00:e50:f155:7::ddmaildomain.datevnet.com ✓ maildomain.datevnet.com ✓ maildomain.datevnet.com ✓ maildomain.datevnet.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.
  • ✓ All hosts have IPv6 #11
    All MX records resolve to IPv6 addresses.
  • ✓ 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 8 MX addresss have a PTR record that resolves back to them.

TLS

warn

no MTA-STS · no TLS-RPT · DANE on 2 of 2 MX hosts

Found

DANE (TLSA records)

MX hostTLSADNSSEC
maildomain.datevnet.de3 1 1 df7a329f8034aef3… 3 1 1 a1f6b077746169fd…Yes
maildomain.datevnet.com3 1 1 df7a329f8034aef3… 3 1 1 a1f6b077746169fd…Yes

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
  • !
    Not configured
    MTA-STS or DANE is used without TLS-RPT, so you get no reports when senders fail to deliver because of TLS problems. Publish _smtp._tls TXT "v=TLSRPTv1; rua=mailto:...".
    #35
  • ✓ DANE on all MX hosts #36
    All 2 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