Mail domain report: mybb.de

SPF

pass

SPF record published

Found

Record: v=spf1 include:mailbox.org ~all
DNS lookups: 2 of 10
Void lookups: 0 of 2

Checks

✓ No deprecated ptr mechanism #1

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

SPF record needs 2 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

warn

p=quarantine (_dmarc.mybb.de)

Found

Record: v=DMARC1; p=quarantine; sp=reject; rua=mailto:e53f943892844be488d471a1eb389a4a@dmarc-reports.cloudflare.net;
Found at: _dmarc.mybb.de
External report address: mailto:e53f943892844be488d471a1eb389a4a@dmarc-reports.cloudflare.net (authorized)

Tag	Value	Meaning
v	DMARC1	Version
p	quarantine	Policy
sp	reject	Subdomain policy
rua	mailto:e53f943892844be488d471a1eb389a4a@dmarc-reports.cloudflare.net	Aggregate report addresses

Checks

!

Policy: quarantine

DMARC policy is set to 'quarantine'. Consider upgrading to 'reject' for stronger protection once you've verified legitimate emails are passing authentication.

#4
✓ 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:e53f943892844be488d471a1eb389a4a@dmarc-reports.cloudflare.net
✓ 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

warn

No keys found under the checked selectors

Found

Selectors: None found
_domainkey: NOERROR

Checks

!

No key under common selectors

The _domainkey name exists but no DKIM key was found under the common selectors. Selectors are provider-specific; check yours with -selector.

#7

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: 11 December 2026, 16:44 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 2026-12-11 #21

DNSKEY signatures are valid until 2026-12-11T16:44:57Z.

MX

pass

4 mail servers

Found

Priority	Host	Records	Reverse DNS
10	mxext1.mailbox.org	A 80.241.60.212 AAAA 2001:67c:2050:104:0:1:25:1	mx1.mailbox.org ✓ mx1.mailbox.org ✓
10	mxext2.mailbox.org	A 80.241.60.215 AAAA 2001:67c:2050:104:0:2:25:1	mx2.mailbox.org ✓ mx2.mailbox.org ✓
10	mxext3.mailbox.org	A 80.241.60.216 AAAA 2001:67c:2050:104:0:3:25:1	mx3.mailbox.org ✓ mx3.mailbox.org ✓
10	mxext4.mailbox.org	A 80.241.60.217 AAAA 2001:67c:2050:104:0:4:25:1	mx4.mailbox.org ✓ mx4.mailbox.org ✓

Checks

✓ 4 MX records #9

Found 4 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 4 MX records, which provides redundancy for email delivery.
✓ At most 5 MX records #13

Found 4 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

warn

no MTA-STS · no TLS-RPT · DANE on 4 of 4 MX hosts

Found

DANE (TLSA records)

MX host	TLSA	DNSSEC
mxext1.mailbox.org	3 1 1 996ad31d65e03f03… 3 1 1 4758af6f02dfb5dc… 3 1 1 e41cc7633029afdb…	Yes
mxext2.mailbox.org	3 1 1 4758af6f02dfb5dc… 3 1 1 996ad31d65e03f03… 3 1 1 e41cc7633029afdb…	Yes
mxext3.mailbox.org	3 1 1 4758af6f02dfb5dc… 3 1 1 996ad31d65e03f03… 3 1 1 e41cc7633029afdb…	Yes
mxext4.mailbox.org	3 1 1 4758af6f02dfb5dc… 3 1 1 e41cc7633029afdb… 3 1 1 996ad31d65e03f03…	Yes

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
!

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 4 MX hosts 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