Mail domain report: lima-city.de

SPF

pass

SPF record published

Found

Record: v=spf1 a:development.lima-city.de include:_mail-out.lima-city.de a:mx-out.trafficplex.de include:mailgun.org include:servers.mcsv.net -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.lima-city.de)

Found

Record: v=DMARC1; p=reject; rua=mailto:dmarc@lima-city.de; ruf=mailto:dmarc@lima-city.de;
Found at: _dmarc.lima-city.de

Tag	Value	Meaning
v	DMARC1	Version
p	reject	Policy
rua	mailto:dmarc@lima-city.de	Aggregate report addresses
ruf	mailto:dmarc@lima-city.de	Failure 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@lima-city.de
✓ Subdomain policy: reject #20

Subdomains are covered by policy 'reject'.
✓ Report addresses in own domain #29

All report addresses are in your own organizational domain.

DKIM

warn

Selectors: default, s1, s2

Found

Selectors: default, s1, s2
_domainkey: NOERROR

Selector	Key	Flags
default	RSA 1024 bits
s1	RSA 2048 bits
s2	RSA 1024 bits

Checks

✓ Keys found: default, s1, s2 #7

DKIM keys found for this domain with selectors: default, s1, s2
!

1024-bit DKIM key

1024-bit RSA keys are the minimum and are considered weak today: default (1024 bits), s2 (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

pass

Signed, DS published at parent

Found

DNSKEY records: Yes (2)
DS at parent: Yes
Algorithms: ECDSAP256SHA256 (13)
Key tags: 34505, 2371
Signatures valid until: 10 December 2026, 08:28 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 2026-12-10 #21

DNSKEY signatures are valid until 2026-12-10T08:28:47Z.

MX

warn

1 mail server

Found

Priority	Host	Records	Reverse DNS
10	mail.lima-city.de	A 212.83.45.134 AAAA 2a10:fc80:4:1::1	mail.lima-city.de ✓ mail.lima-city.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

warn

MTA-STS enforce · no TLS-RPT · DANE on 1 of 1 MX hosts

Found

MTA-STS record: v=STSv1; id=20240815000000Z;
Policy URL: https://mta-sts.lima-city.de/.well-known/mta-sts.txt
Mode: enforce
Allowed MX: mail.lima-city.de
Max age: 86400 seconds

DANE (TLSA records)

MX host	TLSA	DNSSEC
mail.lima-city.de	2 1 1 9d637b3d27a9e570… 3 1 1 f31aca2010847aaa… 2 1 1 919c0df7a787b597… 2 1 1 2bbad93ab5c79279… 2 1 1 025490860b498ab7…	Yes

Checks

✓ Record published #32

MTA-STS record found with id 20240815000000Z.
✓ Policy enforced #33

The MTA-STS policy is enforced and cached for 24h0m0s.
✓ All MX hosts covered #34

Every MX host matches an mx: line of the MTA-STS policy.
!

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