Mail domain report: tbaer.de

SPF

pass

SPF record published

Found

Record: v=spf1 a mx include:mailgun.org ~all
DNS lookups: 7 of 10
Void lookups: 0 of 2

Checks

✓ No deprecated ptr mechanism #1

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

SPF record needs 7 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.tbaer.de)

Found

Record: v=DMARC1;p=reject;pct=100;rua=mailto:f417ef42d845430ab47d2344d33ace86@dmarc-reports.cloudflare.net,mailto:653dc9ca43@rua.easydmarc.eu,mailto:postmaster@tbaer.de;ruf=mailto:653dc9ca43@ruf.easydmarc.eu,mailto:postmaster@tbaer.de;ri=86400;fo=0:1;
Found at: _dmarc.tbaer.de
External report address: mailto:f417ef42d845430ab47d2344d33ace86@dmarc-reports.cloudflare.net (authorized)
External report address: mailto:653dc9ca43@rua.easydmarc.eu (authorized)
External report address: mailto:653dc9ca43@ruf.easydmarc.eu (authorized)

Tag	Value	Meaning
v	DMARC1	Version
p	reject	Policy
pct	100	Percentage of mail the policy applies to
rua	mailto:f417ef42d845430ab47d2344d33ace86@dmarc-reports.cloudflare.net,mailto:653dc9ca43@rua.easydmarc.eu,mailto:postmaster@tbaer.de	Aggregate report addresses
ruf	mailto:653dc9ca43@ruf.easydmarc.eu,mailto:postmaster@tbaer.de	Failure report addresses
fo	0:1	Failure reporting options
ri	86400	Report interval (seconds)

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:f417ef42d845430ab47d2344d33ace86@dmarc-reports.cloudflare.net, mailto:653dc9ca43@rua.easydmarc.eu, mailto:postmaster@tbaer.de
✓ 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

fail

Selectors: default, dkim, email, s1, s2

Found

Selectors: default, dkim, email, s1, s2
_domainkey: NOERROR

Selector	Key	Flags
default	RSA 768 bits
dkim	RSA 2048 bits
email	RSA 2048 bits
s1	RSA 2048 bits
s2	RSA 2048 bits

Checks

✓ Keys found: default, dkim, email, s1, s2 #7

DKIM keys found for this domain with selectors: default, dkim, email, s1, s2
✗

Weak DKIM key

RSA keys shorter than 1024 bits can be cracked and are ignored by receivers (RFC 8301): default (768 bits). Rotate to a 2048-bit key.

#23
✓ No problematic flags #24

No keys in test mode, revoked, or limited to SHA-1.

DNSSEC

pass

Signed, DS published at parent

Found

DNSKEY records: Yes (2)
DS at parent: Yes
Algorithms: ECDSAP256SHA256 (13)
Key tags: 2371, 34505
Signatures valid until: 4 December 2026, 13:19 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 2026-12-04 #21

DNSKEY signatures are valid until 2026-12-04T13:19:54Z.

MX

warn

1 mail server

Found

Priority	Host	Records	Reverse DNS
5	mx.tbaer.de	A 45.86.125.42 AAAA 2a0c:8900:1::89bc:6dad	mx.tbaer.de ✓ mx.tbaer.de ✓

Checks

✓ 1 MX record #9

Found 1 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.
!

Single MX host, no backup

Only one MX record found. For better email reliability, consider adding at least one backup MX server.

#12
✓ At most 5 MX records #13

Found 1 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 2 MX addresss have a PTR record that resolves back to them.

TLS

fail

MTA-STS record without policy · no TLS-RPT · DANE on 1 of 1 MX hosts

Found

MTA-STS record: v=STSv1; id=20250730111100Z
Policy URL: https://mta-sts.tbaer.de/.well-known/mta-sts.txt
Policy error: https://mta-sts.tbaer.de/.well-known/mta-sts.txt returned HTTP 404

DANE (TLSA records)

MX host	TLSA	DNSSEC
mx.tbaer.de	3 1 1 70ff984e1fb7467b…	Yes

Checks

✓ Record published #32

MTA-STS record found with id 20250730111100Z.
✗

Policy not reachable

The MTA-STS record exists but the policy could not be fetched, so senders ignore MTA-STS: https://mta-sts.tbaer.de/.well-known/mta-sts.txt returned HTTP 404.

#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 1 MX host 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