Mail domain report: arctic.de

SPF

fail

SPF record published

Found

Record: v=spf1 ip4:212.53.157.236 include:spf.smtp.net include:_spf.perfora.net include:_spf.kundenserver.de include:secureserver.net include:spf.protection.outlook.com include:mailgun.org ~all
DNS lookups: 12 of 10
Void lookups: 0 of 2

Checks

✓ No deprecated ptr mechanism #1

No ptr mechanism found in SPF record.
✗

12 DNS lookups, over the limit of 10

SPF record needs 12 DNS lookups (including nested includes), more than the limit of 10. Receivers will return a permerror; reduce includes or flatten the record.

#2
✓ 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.arctic.de)

Found

Record: v=DMARC1;p=reject;sp=quarantine;rua=mailto:dmarc@arctic.de;ruf=mailto:dmarc@arctic.de
Found at: _dmarc.arctic.de

Tag	Value	Meaning
v	DMARC1	Version
p	reject	Policy
sp	quarantine	Subdomain policy
rua	mailto:dmarc@arctic.de	Aggregate report addresses
ruf	mailto:dmarc@arctic.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@arctic.de
✓ Subdomain policy: quarantine #20

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

All report addresses are in your own organizational domain.

DKIM

warn

Selectors: default, email, selector1, selector2

Found

Selectors: default, email, selector1, selector2
_domainkey: NOERROR

Selector	Key	Flags
default	RSA 2048 bits
email	RSA 1024 bits
selector1	RSA 2048 bits
selector2	RSA 2048 bits

Checks

✓ Keys found: default, email, selector1, selector2 #7

DKIM keys found for this domain with selectors: default, email, selector1, selector2
!

1024-bit DKIM key

1024-bit RSA keys are the minimum and are considered weak today: email (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

Not signed

Found

DNSKEY records: No (0)
DS at parent: No

Checks

!

Not enabled

DNSSEC is not enabled for this domain. Consider enabling DNSSEC to protect against DNS spoofing attacks.

#8

MX

warn

1 mail server

Found

Priority	Host	Records	Reverse DNS
0	arctic-de.mail.protection.outlook.com	A 52.101.170.2 A 52.101.170.1 A 52.101.170.0 A 52.101.168.0 AAAA 2a01:111:f403:ca27:: AAAA 2a01:111:f403:ca2d:: AAAA 2a01:111:f403:ca2d::2 AAAA 2a01:111:f403:ca2d::1	mail-fr6p281cu00202.inbound.protection.outlook.com ✓ mail-fr4p281cu03101.inbound.protection.outlook.com ✓ mail-fr5p281cu00500.inbound.protection.outlook.com ✓ mail-beup281cu00100.inbound.protection.outlook.com ✓ mail-beup281cu00100.inbound.protection.outlook.com ✓ mail-fr5p281cu00500.inbound.protection.outlook.com ✓ mail-fr6p281cu00202.inbound.protection.outlook.com ✓ mail-fr4p281cu03101.inbound.protection.outlook.com ✓

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 8 MX addresss have a PTR record that resolves back to them.

TLS

info

MTA-STS enforce · TLS-RPT · DANE on 0 of 1 MX hosts

Found

MTA-STS record: v=STSv1; id=20251125162750Z;
Policy URL: https://mta-sts.arctic.de/.well-known/mta-sts.txt
Mode: enforce
Allowed MX: *.mail.protection.outlook.com, mx00.ionos.de, mx01.ionos.de
Max age: 604800 seconds
TLS-RPT record: v=TLSRPTv1;rua=mailto:rua@arctic.de

DANE (TLSA records)

MX host	TLSA	DNSSEC
arctic-de.mail.protection.outlook.com	none	-

Checks

✓ Record published #32

MTA-STS record found with id 20251125162750Z.
✓ Policy enforced #33

The MTA-STS policy is enforced and cached for 168h0m0s.
✓ 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:rua@arctic.de
i

Not used

No MX host publishes TLSA records. DANE lets senders verify your mail server's certificate through DNSSEC; it requires DNSSEC on the MX host's zone.

#36

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