Mail domain report: idealo.de

SPF

pass

SPF record published

Found

Record: v=spf1 include:spf.asv.de include:_spf.google.com include:spf.protection.outlook.com include:_spf.salesforce.com ~all
DNS lookups: 5 of 10
Void lookups: 0 of 2

Checks

✓ No deprecated ptr mechanism #1

No ptr mechanism found in SPF record.
✓ 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

pass

p=reject (_dmarc.idealo.de)

Found

Record: v=DMARC1; p=reject; fo=0; rua=mailto:dmarc-aggregation@idealo.de,mailto:idealo@rua.netcraft.com; ruf=mailto:dmarc-forensic@idealo.de,mailto:idealo@ruf.netcraft.com;
Found at: _dmarc.idealo.de
External report address: mailto:idealo@rua.netcraft.com (authorized)
External report address: mailto:idealo@ruf.netcraft.com (authorized)

Tag	Value	Meaning
v	DMARC1	Version
p	reject	Policy
rua	mailto:dmarc-aggregation@idealo.de,mailto:idealo@rua.netcraft.com	Aggregate report addresses
ruf	mailto:dmarc-forensic@idealo.de,mailto:idealo@ruf.netcraft.com	Failure report addresses
fo	0	Failure reporting options

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-aggregation@idealo.de, mailto:idealo@rua.netcraft.com
✓ 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

Selectors: mail, selector1, selector2, google

Found

Selectors: mail, selector1, selector2, google
_domainkey: NXDOMAIN

Selector	Key	Flags
mail	RSA 1024 bits
selector1	RSA 1024 bits
selector2	RSA 1024 bits
google	RSA 1024 bits

Checks

✓ Keys found: mail, selector1, selector2, google #7

DKIM keys found for this domain with selectors: mail, selector1, selector2, google
!

1024-bit DKIM key

1024-bit RSA keys are the minimum and are considered weak today: mail (1024 bits), selector1 (1024 bits), selector2 (1024 bits), google (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	idealo-de.mail.protection.outlook.com	A 52.101.103.137 A 52.101.91.159 A 52.101.91.153 A 52.101.209.31 AAAA 2a01:111:f403:ca3c::8 AAAA 2a01:111:f403:ca48::e AAAA 2a01:111:f403:ca04::9 AAAA 2a01:111:f403:ca48::c	mail-miypr02cu00101.inbound.protection.outlook.com ✓ mail-matpr04cu00207.inbound.protection.outlook.com ✓ mail-matpr04cu00101.inbound.protection.outlook.com ✓ mail-cpjpr05cu00207.inbound.protection.outlook.com ✓ mail-zrxpr05cu00100.inbound.protection.outlook.com ✓ mail-miypr03cu00206.inbound.protection.outlook.com ✓ mail-db7pr03cu00601.inbound.protection.outlook.com ✓ mail-miypr03cu00104.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

warn

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

Found

MTA-STS record: v=STSv1; id=20250520UhoaThaezeiwahnahmai
Policy URL: https://mta-sts.idealo.de/.well-known/mta-sts.txt
Mode: testing
Allowed MX: idealo-de.mail.protection.outlook.com
Max age: 86400 seconds
TLS-RPT record: v=TLSRPTv1; rua=mailto:tls-report@idealo.de

DANE (TLSA records)

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

Checks

✓ Record published #32

MTA-STS record found with id 20250520UhoaThaezeiwahnahmai.
!

Policy in testing mode

With mode: testing, senders only report TLS problems (via TLS-RPT) and still deliver without TLS. Switch to mode: enforce once reports are clean.

#33
✓ 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:tls-report@idealo.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