Mail domain report: elster.de

SPF

pass

SPF record published

Found

Record: v=spf1 mx include:_spf.blk1.elster.de include:_spf.blk2.elster.de include:_spf.blk3.elster.de include:_spf.blk4.elster.de include:_spf.blk5.elster.de include:_spf.blk6.elster.de include:_spf.blso.elster.de ~all
DNS lookups: 9 of 10
Void lookups: 0 of 2

Checks

✓ No deprecated ptr mechanism #1

No ptr mechanism found in SPF record.
✓ 9 of 10 DNS lookups #2

SPF record needs 9 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.elster.de)

Found

Record: v=DMARC1; p=reject; rua=mailto:nojco5ed@ag.eu.dmarcadvisor.com;
Found at: _dmarc.elster.de
External report address: mailto:nojco5ed@ag.eu.dmarcadvisor.com (authorized)

Tag	Value	Meaning
v	DMARC1	Version
p	reject	Policy
rua	mailto:nojco5ed@ag.eu.dmarcadvisor.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:nojco5ed@ag.eu.dmarcadvisor.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: RSASHA256 (8)
Key tags: 48361, 2799
Signatures valid until: 3 November 2026, 06:27 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 2026-11-03 #21

DNSKEY signatures are valid until 2026-11-03T06:27:13Z.

MX

warn

3 mail servers

Found

Priority	Host	Records	Reverse DNS
30	edmmx02.elster.de	A 217.6.110.189 AAAA 2003:61:4039:2:b8d2:dfff:feba:b948	edmmx02.elster.de ✓ edmmx02.elster.de ✓
30	edmmx03.elster.de	A 217.89.109.134 AAAA 2003:61:4039:2:a425:feff:feac:8155	edmmx03.elster.de ✓ edmmx03.elster.de ✓
99	fake-mx.elster.de	A 185.176.166.38	fake-mx.elster.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: fake-mx.elster.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 5 MX addresss have a PTR record that resolves back to them.

TLS

pass

MTA-STS enforce · TLS-RPT · DANE on 3 of 3 MX hosts

Found

MTA-STS record: v=STSv1; id=20231207010001;
Policy URL: https://mta-sts.elster.de/.well-known/mta-sts.txt
Mode: enforce
Allowed MX: edmmx02.elster.de, edmmx03.elster.de, fake-mx.elster.de, *.elster.de
Max age: 2419200 seconds
TLS-RPT record: v=TLSRPTv1; rua=mailto:nojco5ed@tls.eu.dmarcadvisor.com;

DANE (TLSA records)

MX host	TLSA	DNSSEC
edmmx02.elster.de	3 1 1 df50c2ea2a300800… 3 0 1 e961ccd13ba098be…	Yes
edmmx03.elster.de	3 1 1 df50c2ea2a300800… 3 0 1 e961ccd13ba098be…	Yes
fake-mx.elster.de	3 1 1 df50c2ea2a300800… 3 0 1 e961ccd13ba098be…	Yes

Checks

✓ Record published #32

MTA-STS record found with id 20231207010001.
✓ Policy enforced #33

The MTA-STS policy is enforced and cached for 672h0m0s.
✓ 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:nojco5ed@tls.eu.dmarcadvisor.com
✓ 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