Mail domain report: checkdomain.de

SPF

fail

SPF record published

Found

Record: v=spf1 include:_spf.cio.g1i.one include:mx.spf.checkdomain.de include:web1.spf.checkdomain.de include:spf.protection.outlook.com include:secure-mailgate.com include:mail.zendesk.com ip4:212.123.41.224/28 ip6:2a01:4f8:221:11cd:9734:4c26:6044:5f33 include:_spf.hostedemail.com ~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

fail

p=none (_dmarc.checkdomain.de)

Found

Record: v=DMARC1; p=none; sp=none;rua=mailto:dmarc@cp.wum.dogado.net,mailto:dmarc@mailinblue.com!10m;ruf=mailto:dmarc@cp.wum.dogado.net,mailto:dmarc@mailinblue.com!10m; rf=afrf; pct=100;ri=86400
Found at: _dmarc.checkdomain.de
External report address: mailto:dmarc@cp.wum.dogado.net (authorized)
External report address: mailto:dmarc@mailinblue.com!10m (authorized)

Tag	Value	Meaning
v	DMARC1	Version
p	none	Policy
sp	none	Subdomain policy
pct	100	Percentage of mail the policy applies to
rua	mailto:dmarc@cp.wum.dogado.net,mailto:dmarc@mailinblue.com!10m	Aggregate report addresses
ruf	mailto:dmarc@cp.wum.dogado.net,mailto:dmarc@mailinblue.com!10m	Failure report addresses
rf	afrf	Failure report format
ri	86400	Report interval (seconds)

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:dmarc@cp.wum.dogado.net, mailto:dmarc@mailinblue.com!10m
✓ External report addresses authorized #29

Report addresses in other domains have published their authorization.

DKIM

warn

Selectors: mail, selector1

Found

Selectors: mail, selector1
_domainkey: NOERROR

Selector	Key	Flags
mail	RSA 1024 bits
selector1	RSA 1024 bits

Checks

✓ Keys found: mail, selector1 #7

DKIM keys found for this domain with selectors: mail, selector1
!

1024-bit DKIM key

1024-bit RSA keys are the minimum and are considered weak today: mail (1024 bits), selector1 (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

pass

2 mail servers

Found

Priority	Host	Records	Reverse DNS
10	m1.checkdomain.de	A 88.198.20.145 AAAA 2a01:4f8:222:2b49:5498:d60a:e248:3219	mx1.checkdomain.de ✓ mx1.checkdomain.de ✓
20	m2.checkdomain.de	A 94.130.12.24 AAAA 2a01:4f8:10b:1067:c61b:626:b6c3:fc60	mx2.checkdomain.de ✓ mx2.checkdomain.de ✓

Checks

✓ 2 MX records #9

Found 2 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.
✓ Redundant MX hosts #12

Found 2 MX records, which provides redundancy for email delivery.
✓ At most 5 MX records #13

Found 2 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 4 MX addresss have a PTR record that resolves back to them.

TLS

warn

no MTA-STS · no TLS-RPT · DANE on 0 of 2 MX hosts

Found

DANE (TLSA records)

MX host	TLSA	DNSSEC
m1.checkdomain.de	none	-
m2.checkdomain.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

fail

https://bimi.group-cdn.one/checkdomain/v1/logo.svg

Found

Record: v=BIMI1; l=https://bimi.group-cdn.one/checkdomain/v1/logo.svg; a=https://bimi.group-cdn.one/checkdomain/v1/cert.pem
Found at: default._bimi.checkdomain.de
Logo: https://bimi.group-cdn.one/checkdomain/v1/logo.svg
Certificate: https://bimi.group-cdn.one/checkdomain/v1/cert.pem

Checks

✓ Logo and certificate published #38

BIMI logo: https://bimi.group-cdn.one/checkdomain/v1/logo.svg; certificate: https://bimi.group-cdn.one/checkdomain/v1/cert.pem
✗

DMARC not strict enough for BIMI

Mail clients will not show the logo. BIMI requires DMARC p=quarantine or p=reject (now p=none), a subdomain policy other than sp=none.

#39