immobilienscout24.de

Checked 21 October 2026, 22:52 UTC · via 8.8.8.8
✗Problems found
27 passed 5 warnings 1 failed 1 info

SPF

pass

SPF record published

Found

Record
v=spf1 ip4:85.222.128.0/19 ip4:154.48.197.0/24 ip4:142.132.186.212 ip4:138.201.156.201 include:spf.protection.outlook.com include:_spf1.mailgun.org include:_spf2.mailgun.org include:_spf.eu.mailgun.org include:cust-spf.exacttarget.com include:amazonses.com include:_spf.zimpel.de include:mail.login.immobilienscout24.de include:_spf.salesforce.com ~all
DNS lookups
10 of 10
Void lookups
0 of 2

Checks

  • ✓ No deprecated ptr mechanism #1
    No ptr mechanism found in SPF record.
  • ✓ 10 of 10 DNS lookups #2
    SPF record needs 10 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.immobilienscout24.de)

Found

Record
v=DMARC1;p=reject;rua=mailto:4e63287c4f@rua.easydmarc.eu,mailto:dmarc-aggregation@scout24.com,mailto:dmarc_agg@dmarc.everest.email;ruf=mailto:4e63287c4f@ruf.easydmarc.eu,mailto:dmarc-forensic@scout24.com,mailto:dmarc_fr@dmarc.everest.email;ri=3600;fo=1;
Found at
_dmarc.immobilienscout24.de
External report address
mailto:4e63287c4f@rua.easydmarc.eu (authorized)
External report address
mailto:dmarc-aggregation@scout24.com (not authorized)
External report address
mailto:dmarc_agg@dmarc.everest.email (authorized)
External report address
mailto:4e63287c4f@ruf.easydmarc.eu (authorized)
External report address
mailto:dmarc-forensic@scout24.com (not authorized)
External report address
mailto:dmarc_fr@dmarc.everest.email (authorized)
TagValueMeaning
vDMARC1Version
prejectPolicy
ruamailto:4e63287c4f@rua.easydmarc.eu,mailto:dmarc-aggregation@scout24.com,mailto:dmarc_agg@dmarc.everest.emailAggregate report addresses
rufmailto:4e63287c4f@ruf.easydmarc.eu,mailto:dmarc-forensic@scout24.com,mailto:dmarc_fr@dmarc.everest.emailFailure report addresses
fo1Failure reporting options
ri3600Report interval (seconds)

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:4e63287c4f@rua.easydmarc.eu, mailto:dmarc-aggregation@scout24.com, mailto:dmarc_agg@dmarc.everest.email
  • ✓ Subdomain policy: reject #20
    Subdomains are covered by policy 'reject'.
  • !
    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:dmarc-aggregation@scout24.com (needs immobilienscout24.de._report._dmarc.scout24.com); mailto:dmarc-forensic@scout24.com (needs immobilienscout24.de._report._dmarc.scout24.com). Ask the report provider to publish the record, or check the address.
    #29

DKIM

warn

Selectors: k1, selector2

Found

Selectors
k1, selector2
_domainkey
NOERROR
SelectorKeyFlags
k1RSA 1024 bits
selector2RSA 1024 bits

Checks

  • ✓ Keys found: k1, selector2 #7
    DKIM keys found for this domain with selectors: k1, selector2
  • !
    1024-bit DKIM key
    1024-bit RSA keys are the minimum and are considered weak today: k1 (1024 bits), selector2 (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

1 mail server

Found

PriorityHostRecordsReverse DNS
10immobilienscout24-de.mail.protection.outlook.comA 52.101.73.126 A 52.101.91.159 A 52.101.91.156 A 52.101.68.29 AAAA 2a01:111:f403:ca04::b AAAA 2a01:111:f403:ca38::a AAAA 2a01:111:f403:ca3c::8 AAAA 2a01:111:f403:ca3c::6mail-am8pr83cu00106.inbound.protection.outlook.com ✓ mail-matpr04cu00207.inbound.protection.outlook.com ✓ mail-maspr04cu00104.inbound.protection.outlook.com ✓ mail-dbapr03cu00105.inbound.protection.outlook.com ✓ mail-dbbpr03cu00103.inbound.protection.outlook.com ✓ mail-wa4pr05cu00102.inbound.protection.outlook.com ✓ mail-zrxpr05cu00100.inbound.protection.outlook.com ✓ mail-zrxpr04cu00106.inbound.protection.outlook.com ✓

Checks

  • ✓ 1 MX record #9
    Found 1 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.
  • !
    Single MX host, no backup
    Only one MX record found. For better email reliability, consider adding at least one backup MX server.
    #12
  • ✓ At most 5 MX records #13
    Found 1 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

fail

MTA-STS none · TLS-RPT · DANE on 0 of 1 MX hosts

Found

MTA-STS record
v=STSv1; id=2026-03-09T14:00:24Z
Policy URL
https://mta-sts.immobilienscout24.de/.well-known/mta-sts.txt
Mode
none
Allowed MX
immobilienscout24-de.mail.protection.outlook.com
Max age
604800 seconds
TLS-RPT record
v=TLSRPTv1; rua=mailto:tlsrpt@immobilienscout24.de

DANE (TLSA records)

MX hostTLSADNSSEC
immobilienscout24-de.mail.protection.outlook.comnone-

Checks

  • ✗
    Invalid MTA-STS record
    Senders ignore the MTA-STS record because of: id "2026-03-09T14:00:24Z" must be 1 to 32 letters or digits.
    #32
  • !
    Policy disabled (mode: none)
    The MTA-STS policy is switched off with mode: none.
    #33
  • ✓ Reports enabled #35
    TLS reports are sent to: mailto:tlsrpt@immobilienscout24.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.easydmarc.com/4e63287c4f/bimi-immobilienscout24-de-b232b041.svg

Found

Record
v=BIMI1;l=https://assets.easydmarc.com/4e63287c4f/bimi-immobilienscout24-de-b232b041.svg;a=https://assets.easydmarc.com/4e63287c4f/bimi-immobilienscout24-de-e0c33201.pem;avp=brand
Found at
default._bimi.immobilienscout24.de
Logo
https://assets.easydmarc.com/4e63287c4f/bimi-immobilienscout24-de-b232b041.svg
Certificate
https://assets.easydmarc.com/4e63287c4f/bimi-immobilienscout24-de-e0c33201.pem

Checks

  • ✓ Logo and certificate published #38
    BIMI logo: https://assets.easydmarc.com/4e63287c4f/bimi-immobilienscout24-de-b232b041.svg; certificate: https://assets.easydmarc.com/4e63287c4f/bimi-immobilienscout24-de-e0c33201.pem
  • ✓ DMARC meets BIMI requirements #39
    DMARC is enforced on all mail, as BIMI requires.