ipk-gatersleben.de

Checked 21 October 2026, 23:00 UTC · via 8.8.8.8
✗Problems found
23 passed 5 warnings 2 failed 1 info

SPF

pass

SPF record published

Found

Record
v=spf1 ip4:194.94.136.88/29 ip4:62.55.182.68 ip4:136.243.160.30 include:spf.mailsupport.dfn.de -all
DNS lookups
1 of 10
Void lookups
0 of 2

Checks

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

fail

p=none (_dmarc.ipk-gatersleben.de)

Found

Record
v=DMARC1; p=none
Found at
_dmarc.ipk-gatersleben.de
TagValueMeaning
vDMARC1Version
pnonePolicy

Checks

  • ✗
    Policy: none (monitoring only)
    DMARC policy is set to 'none', which only monitors but doesn't protect against spoofing. Consider upgrading to 'quarantine' or ideally 'reject'.
    #4
  • ✓ Record published #5
    DMARC record exists for this domain.
  • ✓ Valid syntax #17
    DMARC record syntax is valid.
  • !
    No aggregate reports (rua)
    DMARC record has no rua tag, so you receive no aggregate reports about who sends mail as your domain. Add rua=mailto:...
    #19

DKIM

warn

Selectors: s1

Found

Selectors
s1
_domainkey
NOERROR
SelectorKeyFlags
s1RSA 1024 bits

Checks

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

Signed, DS published at parent

Found

DNSKEY records
Yes (2)
DS at parent
Yes
Algorithms
ECDSAP256SHA256 (13)
Key tags
9010, 28010
Signatures valid until
27 October 2026, 08:23 UTC

Checks

  • ✓ Signed, DS published at parent #8
    DNSSEC is enabled for this domain (DNSKEY and DS present), providing additional security for DNS lookups.
  • !
    Signatures expire in 129h0m0s
    DNSKEY signatures expire at 2026-10-27T08:23:19Z (in 129h0m0s). Check that re-signing works.
    #21

MX

warn

3 mail servers

Found

PriorityHostRecordsReverse DNS
10a1191.mx.srv.dfn.deA 194.95.232.55a1191.mx.srv.dfn.de ✓
10b1191.mx.srv.dfn.deA 194.95.234.55b1191.mx.srv.dfn.de ✓
10c1191.mx.srv.dfn.deA 194.95.238.55c1191.mx.srv.dfn.de ✓

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: a1191.mx.srv.dfn.de, b1191.mx.srv.dfn.de, c1191.mx.srv.dfn.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 3 MX addresss have a PTR record that resolves back to them.

TLS

fail

MTA-STS record without policy · no TLS-RPT · DANE on 3 of 3 MX hosts

Found

MTA-STS record
v=STSv1; id=20190326T143500
Policy URL
https://mta-sts.ipk-gatersleben.de/.well-known/mta-sts.txt
Policy error
https://mta-sts.ipk-gatersleben.de/.well-known/mta-sts.txt returned HTTP 503

DANE (TLSA records)

MX hostTLSADNSSEC
a1191.mx.srv.dfn.de3 0 1 9bec67f55f2afdb7…Yes
b1191.mx.srv.dfn.de3 0 1 9bec67f55f2afdb7…Yes
c1191.mx.srv.dfn.de3 0 1 9bec67f55f2afdb7…Yes

Checks

  • ✓ Record published #32
    MTA-STS record found with id 20190326T143500.
  • ✗
    Policy not reachable
    The MTA-STS record exists but the policy could not be fetched, so senders ignore MTA-STS: https://mta-sts.ipk-gatersleben.de/.well-known/mta-sts.txt returned HTTP 503.
    #33
  • !
    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 3 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