Arnold AG

arnold.ch

Industry: Construction & real estate
Headquarters: Wollerau, Schwyz
Type: private
Employees (approx.): 1,000
Checked on: 19 October 2026

70/100Grade B

Protection against forged senders: protected

Points per criterion

MX 10 / 10
SPF 15 / 15
DKIM 20 / 20
DMARC 25 / 25
DNSSEC 0 / 10
Transport (MTA-STS/DANE) 0 / 15
TLS-RPT 0 / 5

Industry avg.: 58.2 ▲ 11.8
Canton avg.: 59.7 ▲ 10.3
Overall avg.: 53.5 ▲ 16.5
Rank 14 of 67 in the industry

Findings

!SPF close to the 10-lookup limit (8)

One more sending service can break the limit. Flattening or subdomains for third parties create headroom.
!DKIM key below 2048 bits

RSA-1024 is considered too weak (RFC 8301, M3AAWG). Rotate to 2048-bit keys.
!DNSSEC not enabled

Without DNSSEC, DNS answers can be forged in transit. DANE requires DNSSEC.
!No MTA-STS

Without MTA-STS (or DANE) inbound encryption is not enforced; an attacker on the path can downgrade to plain text.
!No TLS reporting (TLS-RPT)

Without TLS-RPT the organisation does not learn when senders fail to deliver encrypted.

Check live in the Mail DNS Check →

Who runs the mail?

Mailbox provider: Microsoft 365
Provider jurisdiction: USA · MX: US
Detection confidence: 100 / 100
Microsoft tenant: Managed · BKW
Tenant region: EU

Signals (7)

MX	Microsoft 365	`arnold-ch.mail.protection.outlook.com`
SPF	Microsoft 365	`include:spf.protection.outlook.com`
DKIM	Microsoft 365	`selector1 → selector1-arnold-ch._domainkey.bkwfmbenergie.onmicrosoft.com`
Autodiscover	Microsoft 365	`autodiscover.outlook.com`
Network	Microsoft 365	`AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation`
Domain verification	Google Workspace	`google-site-verification=F9WJCtSgLx9Spp0`
Entra ID	Microsoft 365	`Entra-ID-Tenant (Managed)`

MX servers

Pref	Host	IP	Network	Country	TLSA
0	`arnold-ch.mail.protection.outlook.com`	`52.101.181.156`	AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation	US	–
		`52.101.73.126`	AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation	US
		`52.101.68.10`	AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation	US

SPF

v=spf1 include:spf.protection.bkw.ch include:_spf1.arnold.ch include:_spf2.arnold.ch ip4:185.12.5.82 ip4:46.163.78.207 ip4:94.230.211.160/27 ip4:5.148.164.48/28 include:spf.rpost.net include:spf.sendinblue.com include:spf.crsend.com -all

all: -all
DNS lookups: 8 / 10
Includes: spf.protection.bkw.ch_spf1.arnold.ch_spf2.arnold.chspf.rpost.netspf.sendinblue.comspf.crsend.com
Detected sending services: Microsoft 365, SAP, Brevo
IPv4: 50 addresses authorised directly

DMARC

v=DMARC1; p=reject; rua=mailto:dmarc_agg@vali.email,mailto:uqlw4b1f@ag.eu.dmarcadvisor.com; ruf=mailto:uqlw4b1f@fr.eu.dmarcadvisor.com;

Policy: p=reject
Subdomains (sp): inherits p=reject
Share (pct): 100 %
Alignment DKIM/SPF: relaxed / relaxed
Aggregate reports (rua): dmarc_agg@vali.emailuqlw4b1f@ag.eu.dmarcadvisor.com
Forensic reports (ruf): uqlw4b1f@fr.eu.dmarcadvisor.com
Report services: DMARC Advisor

DKIM

Selector	Key	delegated to
`mail`	RSA 1024	–
`selector1`	RSA 2048	`selector1-arnold-ch._domainkey.bkwfmbenergie.onmicrosoft.com`

Checked: 100 common selectors. Keys under custom selectors remain invisible.

Transport encryption

MTA-STS: missing
DANE: missing
DNSSEC: missing
TLS-RPT: missing
BIMI: missing

Verified services

From verification records in the domain TXT: services where the domain is verified.

GoogleAtlassianBrevoNotion

History

18 October 2026 Score 70 · DMARC reject

All changes of this organisation in the change log →

Raw data

arnold.ch. IN MX 0 arnold-ch.mail.protection.outlook.com.
arnold.ch. IN TXT "v=spf1 include:spf.protection.bkw.ch include:_spf1.arnold.ch include:_spf2.arnold.ch ip4:185.12.5.82 ip4:46.163.78.207 ip4:94.230.211.160/27 ip4:5.148.164.48/28 include:spf.rpost.net include:spf.sendinblue.com include:spf.crsend.com -all"
_dmarc.arnold.ch. IN TXT "v=DMARC1; p=reject; rua=mailto:dmarc_agg@vali.email,mailto:uqlw4b1f@ag.eu.dmarcadvisor.com; ruf=mailto:uqlw4b1f@fr.eu.dmarcadvisor.com;"

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