Mail domain report: gelsenkirchen.de

SPF

pass

SPF record published

Found

Record: v=spf1 mx ~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

pass

p=reject (_dmarc.gelsenkirchen.de)

Found

Record: v=DMARC1; p=reject; rua=mailto:t2ardjkj@ag.dmarcian.com
Found at: _dmarc.gelsenkirchen.de
External report address: mailto:t2ardjkj@ag.dmarcian.com (authorized)

Tag	Value	Meaning
v	DMARC1	Version
p	reject	Policy
rua	mailto:t2ardjkj@ag.dmarcian.com	Aggregate 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:t2ardjkj@ag.dmarcian.com
✓ 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

pass

Signed, DS published at parent

Found

DNSKEY records: Yes (2)
DS at parent: Yes
Algorithms: ECDSAP256SHA256 (13)
Key tags: 10605, 31307
Signatures valid until: 29 October 2026, 00:00 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 valid until 2026-10-29 #21

DNSKEY signatures are valid until 2026-10-29T00:00:00Z.

MX

warn

2 mail servers

Found

Priority	Host	Records	Reverse DNS
50	mailgw.gkd-el.de	A 217.70.161.171	mailgw.gkd-el.de ✓
100	filter.gkd-el.de	A 217.70.161.173 AAAA 2a02:1670:ff00:9::11	filter.gkd-el.de ✓ filter.gkd-el.de ✓

Checks

✓ 2 MX records #9

Found 2 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: mailgw.gkd-el.de

#11
✓ Redundant MX hosts #12

Found 2 MX records, which provides redundancy for email delivery.
✓ At most 5 MX records #13

Found 2 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 · TLS-RPT · DANE on 2 of 2 MX hosts

Found

MTA-STS record: v=STSv1; id=2018102901
Policy URL: https://mta-sts.gelsenkirchen.de/.well-known/mta-sts.txt
Policy error: https://mta-sts.gelsenkirchen.de/.well-known/mta-sts.txt returned HTTP 503
TLS-RPT record: v=TLSRPTv1; rua=mailto:abuse@gkd-el.de

DANE (TLSA records)

MX host	TLSA	DNSSEC
mailgw.gkd-el.de	3 0 1 55682af38b06d8f1…	Yes
filter.gkd-el.de	3 0 1 97fcf8d6b84cdc8f…	Yes

Checks

✓ Record published #32

MTA-STS record found with id 2018102901.
✗

Policy not reachable

The MTA-STS record exists but the policy could not be fetched, so senders ignore MTA-STS: https://mta-sts.gelsenkirchen.de/.well-known/mta-sts.txt returned HTTP 503.

#33
✓ Reports enabled #35

TLS reports are sent to: mailto:abuse@gkd-el.de
✓ DANE on all MX hosts #36

All 2 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