Mail domain report: nibis.de

SPF

warn

SPF record published

Found

Record: v=spf1 a mx ptr a:mail1.nibis.de a:schulleitungspostfach.nibis.de ip4:213.23.76.0/24 ip4:213.239.225.126/32 ip4:94.130.128.186/32 ~all
DNS lookups: 5 of 10
Void lookups: 0 of 2

Checks

!

Uses deprecated ptr mechanism

The ptr mechanism in SPF records is deprecated due to performance issues and should be avoided.

#1
✓ 5 of 10 DNS lookups #2

SPF record needs 5 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

fail

p=none (_dmarc.nibis.de)

Found

Record: v=DMARC1; p=none; rua=mailto:0605b86f37f54fd5bccb5e0cc161f9f9@dmarc-reports.cloudflare.net
Found at: _dmarc.nibis.de
External report address: mailto:0605b86f37f54fd5bccb5e0cc161f9f9@dmarc-reports.cloudflare.net (authorized)

Tag	Value	Meaning
v	DMARC1	Version
p	none	Policy
rua	mailto:0605b86f37f54fd5bccb5e0cc161f9f9@dmarc-reports.cloudflare.net	Aggregate report addresses

Checks

✗

Policy: none (monitoring only)

DMARC policy is set to 'none', which only monitors but doesn't protect against spoofing. Consider upgrading to 'quarantine' or ideally 'reject'.

#4
✓ Record published #5

DMARC record exists for this domain.
✓ Valid syntax #17

DMARC record syntax is valid.
✓ Aggregate reports enabled #19

Aggregate reports are sent to: mailto:0605b86f37f54fd5bccb5e0cc161f9f9@dmarc-reports.cloudflare.net
✓ External report addresses authorized #29

Report addresses in other domains have published their authorization.

DKIM

pass

Selectors: dkim

Found

Selectors: dkim
_domainkey: NOERROR

Selector	Key	Flags
dkim	RSA 2048 bits

Checks

✓ Keys found: dkim #7

DKIM keys found for this domain with selectors: dkim
✓ Strong keys #23

DKIM keys are strong enough: dkim: RSA 2048 bits.
✓ 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
10	mail.nibis.de	CNAME mail1.nibis.de A 94.130.128.186 AAAA 2a01:4f8:13b:3b47::3	mail1.nibis.de ✓ mail1.nibis.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.
!

Hosts are CNAMEs

MX records must point to a host name with A/AAAA records, not to a CNAME: mail.nibis.de -> mail1.nibis.de

#22
✓ Reverse DNS confirmed #30

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

TLS

warn

no MTA-STS · no TLS-RPT · DANE on 0 of 1 MX hosts

Found

DANE (TLSA records)

MX host	TLSA	DNSSEC
mail.nibis.de	none	-

Checks

!

Not configured

MTA-STS is not configured, so other mail servers fall back to unencrypted delivery when TLS fails or is stripped by an attacker. Publish a _mta-sts TXT record and a policy at https://mta-sts.<domain>/.well-known/mta-sts.txt.

#32
i

Not configured

TLS-RPT lets senders report TLS delivery problems to you. It is most useful together with MTA-STS or DANE.

#35
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