stadtwerke-muenster.de

Checked 22 October 2026, 00:30 UTC · via 8.8.8.8
✗Problems found
18 passed 5 warnings 2 failed 1 info

SPF

fail

SPF record published

Found

Record
v=spf1 include:agenturserver.de include:spf-a.mymxserver.com include:spf.items-web.de include:spf-b.mymxserver.com include:spf-c.mymxserver.com include:spf.mailjet.com include:_spf.kundenserver.de ip4:87.118.116.204 ip4:87.118.117.204 include:spf.protection.outlook.com ip4:52.174.36.153 ip4:20.93.129.239 ip4:212.34.64.185 include:spf.stadtwerke-muenster-de.cloud.nospamproxy.com include:spf.mandrillapp.com include:spf.mailjet.com -all
DNS lookups
11 of 10
Void lookups
0 of 2

Checks

  • ✓ No deprecated ptr mechanism #1
    No ptr mechanism found in SPF record.
  • ✗
    11 DNS lookups, over the limit of 10
    SPF record needs 11 DNS lookups (including nested includes), more than the limit of 10. Receivers will return a permerror; reduce includes or flatten the record.
    #2
  • ✓ 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

fail

No DMARC record found

Checks

  • ✗
    No DMARC record
    No DMARC record was found for this domain. DMARC is essential for preventing email spoofing. Add a DMARC record with p=reject or at least p=quarantine.
    #5

DKIM

pass

Selectors: s1, s2

Found

Selectors
s1, s2
_domainkey
NOERROR
SelectorKeyFlags
s1RSA 2048 bits
s2RSA 2048 bits

Checks

  • ✓ Keys found: s1, s2 #7
    DKIM keys found for this domain with selectors: s1, s2
  • ✓ Strong keys #23
    DKIM keys are strong enough: s1: RSA 2048 bits; s2: RSA 2048 bits.
  • ✓ 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
5stadtwerke-muenster-de.mail.cloud.nospamproxy.comA 178.212.92.82 A 193.37.132.106de-s127-gw2.mail.cloud.nospamproxy.com ✓ de-s127-gw1.mail.cloud.nospamproxy.com ✓
10mail.stadtwerke-muenster.deA 178.212.92.82 A 193.37.132.106de-s127-gw2.mail.cloud.nospamproxy.com ✓ de-s127-gw1.mail.cloud.nospamproxy.com ✓
10mail2.stadtwerke-muenster.deA 178.212.92.82 A 193.37.132.106de-s127-gw2.mail.cloud.nospamproxy.com ✓ de-s127-gw1.mail.cloud.nospamproxy.com ✓

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: stadtwerke-muenster-de.mail.cloud.nospamproxy.com, mail.stadtwerke-muenster.de, mail2.stadtwerke-muenster.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 6 MX addresss have a PTR record that resolves back to them.

TLS

warn

no MTA-STS · no TLS-RPT · DANE on 1 of 3 MX hosts

Found

DANE (TLSA records)

MX hostTLSADNSSEC
stadtwerke-muenster-de.mail.cloud.nospamproxy.com3 1 1 15987f49fc954bba… 3 1 1 4a8ccc4c8ae3d658… 3 1 1 7acc5ebfd159a58b… 3 1 1 897f916ec02bfb38…Yes
mail.stadtwerke-muenster.denone-
mail2.stadtwerke-muenster.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
  • !
    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
  • !
    Not all MX hosts use DANE
    These MX hosts publish no TLSA records, so mail to them is not protected by DANE: mail.stadtwerke-muenster.de, mail2.stadtwerke-muenster.de.
    #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