fraunhofer.de

Checked 21 October 2026, 22:31 UTC · via 8.8.8.8
!Passed with warnings
27 passed 4 warnings 0 failed 3 info

SPF

info

SPF record published

Found

Record
v=spf1 redirect=_spf.fraunhofer.de
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).
  • i
    Delegated via redirect
    SPF record has no 'all' mechanism but redirects to _spf.fraunhofer.de, whose policy applies.
    #3
  • ✓ 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=quarantine (_dmarc.fraunhofer.de)

Found

Record
v=DMARC1;p=quarantine;sp=quarantine;aspf=r;adkim=r;fo=0;rua=mailto:rua@dmarc.fraunhofer.de;ruf=mailto:ruf@dmarc.fraunhofer.de;
Found at
_dmarc.fraunhofer.de
TagValueMeaning
vDMARC1Version
pquarantinePolicy
spquarantineSubdomain policy
ruamailto:rua@dmarc.fraunhofer.deAggregate report addresses
rufmailto:ruf@dmarc.fraunhofer.deFailure report addresses
adkimrDKIM alignment (r = relaxed, s = strict)
aspfrSPF alignment (r = relaxed, s = strict)
fo0Failure reporting options

Checks

  • !
    Policy: quarantine
    DMARC policy is set to 'quarantine'. Consider upgrading to 'reject' for stronger protection once you've verified legitimate emails are passing authentication.
    #4
  • ✓ 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:rua@dmarc.fraunhofer.de
  • ✓ Subdomain policy: quarantine #20
    Subdomains are covered by policy 'quarantine'.
  • ✓ Report addresses in own domain #29
    All report addresses are in your own organizational domain.

DKIM

warn

Selectors: s1, s2

Found

Selectors
s1, s2
_domainkey
NOERROR
SelectorKeyFlags
s1RSA 1024 bits
s2RSA 1024 bits

Checks

  • ✓ Keys found: s1, s2 #7
    DKIM keys found for this domain with selectors: s1, s2
  • !
    1024-bit DKIM key
    1024-bit RSA keys are the minimum and are considered weak today: s1 (1024 bits), s2 (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

pass

4 mail servers

Found

PriorityHostRecordsReverse DNS
10edge01.mx.fraunhofer.deA 192.102.163.204 A 192.102.154.221 A 192.102.163.124 A 153.96.1.27 A 153.96.1.24 A 192.102.163.195 A 192.102.154.218 A 153.96.1.30 A 192.102.154.220 AAAA 2a03:db80:4420:b000::25:27 AAAA 2a03:db80:4420:b000::25:24 AAAA 2a03:db80:4420:b000::25:30mail-edgebi204.fraunhofer.de ✓ mail-edgemuc221.fraunhofer.de ✓ mail-edgebi124.fraunhofer.de ✓ mail-edgeka27.fraunhofer.de ✓ mail-edgeka24.fraunhofer.de ✓ mail-edgebi195.fraunhofer.de ✓ mail-edgemuc218.fraunhofer.de ✓ mail-edgeka30.fraunhofer.de ✓ mail-edgemuc220.fraunhofer.de ✓ mail-edgeka27.fraunhofer.de ✓ mail-edgeka24.fraunhofer.de ✓ mail-edgeka30.fraunhofer.de ✓
20edge02.mx.fraunhofer.deA 192.102.154.220 A 192.102.154.218 A 192.102.163.124 A 192.102.163.195 A 153.96.1.24 A 192.102.154.221 A 192.102.163.204 A 153.96.1.30 A 153.96.1.27 AAAA 2a03:db80:4420:b000::25:30 AAAA 2a03:db80:4420:b000::25:27 AAAA 2a03:db80:4420:b000::25:24mail-edgemuc220.fraunhofer.de ✓ mail-edgemuc218.fraunhofer.de ✓ mail-edgebi124.fraunhofer.de ✓ mail-edgebi195.fraunhofer.de ✓ mail-edgeka24.fraunhofer.de ✓ mail-edgemuc221.fraunhofer.de ✓ mail-edgebi204.fraunhofer.de ✓ mail-edgeka30.fraunhofer.de ✓ mail-edgeka27.fraunhofer.de ✓ mail-edgeka30.fraunhofer.de ✓ mail-edgeka27.fraunhofer.de ✓ mail-edgeka24.fraunhofer.de ✓
30edge03.mx.fraunhofer.deA 192.102.154.220 A 192.102.154.218 A 192.102.163.124 A 153.96.1.30 A 192.102.163.195 A 192.102.163.204 A 153.96.1.24 A 153.96.1.27 A 192.102.154.221 AAAA 2a03:db80:4420:b000::25:30 AAAA 2a03:db80:4420:b000::25:27 AAAA 2a03:db80:4420:b000::25:24mail-edgemuc220.fraunhofer.de ✓ mail-edgemuc218.fraunhofer.de ✓ mail-edgebi124.fraunhofer.de ✓ mail-edgeka30.fraunhofer.de ✓ mail-edgebi195.fraunhofer.de ✓ mail-edgebi204.fraunhofer.de ✓ mail-edgeka24.fraunhofer.de ✓ mail-edgeka27.fraunhofer.de ✓ mail-edgemuc221.fraunhofer.de ✓ mail-edgeka30.fraunhofer.de ✓ mail-edgeka27.fraunhofer.de ✓ mail-edgeka24.fraunhofer.de ✓
40edge04.mx.fraunhofer.deA 153.96.1.30 A 192.102.163.195 A 192.102.163.204 A 153.96.1.27 A 192.102.154.220 A 192.102.163.124 A 192.102.154.221 A 192.102.154.218 A 153.96.1.24 AAAA 2a03:db80:4420:b000::25:27 AAAA 2a03:db80:4420:b000::25:30 AAAA 2a03:db80:4420:b000::25:24mail-edgeka30.fraunhofer.de ✓ mail-edgebi195.fraunhofer.de ✓ mail-edgebi204.fraunhofer.de ✓ mail-edgeka27.fraunhofer.de ✓ mail-edgemuc220.fraunhofer.de ✓ mail-edgebi124.fraunhofer.de ✓ mail-edgemuc221.fraunhofer.de ✓ mail-edgemuc218.fraunhofer.de ✓ mail-edgeka24.fraunhofer.de ✓ mail-edgeka27.fraunhofer.de ✓ mail-edgeka30.fraunhofer.de ✓ mail-edgeka24.fraunhofer.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.
  • ✓ All hosts have IPv6 #11
    All MX records resolve to IPv6 addresses.
  • ✓ 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 48 MX addresss have a PTR record that resolves back to them.

TLS

warn

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

Found

MTA-STS record
v=STSv1; id=20260618080000Z;
Policy URL
https://mta-sts.fraunhofer.de/.well-known/mta-sts.txt
Mode
testing
Allowed MX
edge01.mx.fraunhofer.de, edge02.mx.fraunhofer.de, edge03.mx.fraunhofer.de, edge04.mx.fraunhofer.de
Max age
604800 seconds
TLS-RPT record
v=TLSRPTv1;rua=mailto:smtp-tlsrpt@dmarc.fraunhofer.de

DANE (TLSA records)

MX hostTLSADNSSEC
edge01.mx.fraunhofer.denone-
edge02.mx.fraunhofer.denone-
edge03.mx.fraunhofer.denone-
edge04.mx.fraunhofer.denone-

Checks

  • ✓ Record published #32
    MTA-STS record found with id 20260618080000Z.
  • !
    Policy in testing mode
    With mode: testing, senders only report TLS problems (via TLS-RPT) and still deliver without TLS. Switch to mode: enforce once reports are clean.
    #33
  • ✓ 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:smtp-tlsrpt@dmarc.fraunhofer.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

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