uni-kassel.de

Checked 22 October 2026, 00:50 UTC · via 8.8.8.8
!Passed with warnings
26 passed 3 warnings 0 failed 3 info

SPF

info

SPF record published

Found

Record
v=spf1 redirect=15777.hosted-spf.de
DNS lookups
4 of 10
Void lookups
0 of 2

Checks

  • ✓ No deprecated ptr mechanism #1
    No ptr mechanism found in SPF record.
  • ✓ 4 of 10 DNS lookups #2
    SPF record needs 4 DNS lookups (limit is 10).
  • i
    Delegated via redirect
    SPF record has no 'all' mechanism but redirects to 15777.hosted-spf.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

pass

p=reject (_dmarc.uni-kassel.de)

Found

Record
v=DMARC1; p=reject; rua=mailto:dmarc+aggregated@reports.nicmanager.net
Found at
_dmarc.uni-kassel.de
External report address
mailto:dmarc+aggregated@reports.nicmanager.net (authorized)
TagValueMeaning
vDMARC1Version
prejectPolicy
ruamailto:dmarc+aggregated@reports.nicmanager.netAggregate 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:dmarc+aggregated@reports.nicmanager.net
  • ✓ Subdomain policy: reject #20
    Subdomains are covered by policy 'reject'.
  • ✓ External report addresses authorized #29
    Report addresses in other domains have published their authorization.

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

warn

4 mail servers

Found

PriorityHostRecordsReverse DNS
10mx1.its.uni-kassel.deA 141.51.12.54mx1.its.uni-kassel.de ✓
10mx2.its.uni-kassel.deA 141.51.12.52mx2.its.uni-kassel.de ✓
10mx3.its.uni-kassel.deA 141.51.12.56mx3.its.uni-kassel.de ✓
10mx4.its.uni-kassel.deA 141.51.12.57mx4.its.uni-kassel.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: mx1.its.uni-kassel.de, mx2.its.uni-kassel.de, mx3.its.uni-kassel.de, mx4.its.uni-kassel.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

info

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

Found

MTA-STS record
v=STSv1; id=1779275379;
Policy URL
https://mta-sts.uni-kassel.de/.well-known/mta-sts.txt
Mode
enforce
Allowed MX
mx1.its.uni-kassel.de, mx3.its.uni-kassel.de, mx2.its.uni-kassel.de, mx4.its.uni-kassel.de
Max age
604800 seconds
TLS-RPT record
v=TLSRPTv1; rua=mailto:tlsrpt@reports.nicmanager.net;

DANE (TLSA records)

MX hostTLSADNSSEC
mx1.its.uni-kassel.denone-
mx2.its.uni-kassel.denone-
mx3.its.uni-kassel.denone-
mx4.its.uni-kassel.denone-

Checks

  • ✓ Record published #32
    MTA-STS record found with id 1779275379.
  • ✓ Policy enforced #33
    The MTA-STS policy is enforced and cached for 168h0m0s.
  • ✓ 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:tlsrpt@reports.nicmanager.net
  • 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