BDO Schweiz

bdo.ch

Industry: Consulting & audit
Headquarters: Zürich, Zurich
Type: private
Employees (approx.): 1,600
Checked on: 19 October 2026

97/100Grade A

Protection against forged senders: protected

Points per criterion

MX 10 / 10
SPF 15 / 15
DKIM 20 / 20
DMARC 25 / 25
DNSSEC 10 / 10
Transport (MTA-STS/DANE) 12 / 15
TLS-RPT 5 / 5

Industry avg.: 66.8 ▲ 30.2
Canton avg.: 53 ▲ 44
Overall avg.: 53.5 ▲ 43.5
Rank 1 of 45 in the industry

Findings

No findings.

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 · BDO AG
Tenant region: EU

Signals (8)

MX	Microsoft 365	`bdo-ch.mail.protection.outlook.com`
SPF	Microsoft 365	`include:spf.protection.outlook.com`
DKIM	Microsoft 365	`selector1 → selector1-bdo-ch._domainkey.bdoch.onmicrosoft.com`
Autodiscover	Microsoft 365	`autodiscover.outlook.com`
Domain verification	Microsoft 365	`MS=ms51228965`
Network	Microsoft 365	`AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation`
Domain verification	Google Workspace	`google-site-verification=dWslSH1yYKPPaPu`
Entra ID	Microsoft 365	`Entra-ID-Tenant (Managed)`

MX servers

Pref	Host	IP	Network	Country	TLSA
10	`bdo-ch.mail.protection.outlook.com`	`52.101.185.13`	AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation	US	–
		`52.101.185.14`	AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation	US
		`52.101.185.12`	AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation	US

SPF

v=spf1 mx a:securemail2mx.bdo.ch ip4:20.250.176.6 ip4:20.199.180.205 ip4:20.203.165.75 include:spf.protection.outlook.com include:spf.abacuscity.ch include:spf.privasphere.com -all

all: -all
DNS lookups: 6 / 10
Includes: spf.protection.outlook.comspf.abacuscity.chspf.privasphere.com
Detected sending services: Microsoft 365
IPv4: 3 addresses authorised directly

DMARC

v=DMARC1; p=reject; rua=mailto:informatik@bdo.ch; sp=reject; fo=1; adkim=r; aspf=r

Policy: p=reject
Subdomains (sp): reject
Share (pct): 100 %
Alignment DKIM/SPF: relaxed / relaxed
Aggregate reports (rua): informatik@bdo.ch

DKIM

Selector	Key	delegated to
`default`	RSA 2048	–
`selector1`	RSA 2048	`selector1-bdo-ch._domainkey.bdoch.onmicrosoft.com`
`selector2`	RSA 2048	`selector2-bdo-ch._domainkey.bdoch.onmicrosoft.com`

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

Transport encryption

MTA-STS: Mode: enforce · max_age: 300 s · covers all MX: yes
mx: *.mail.protection.outlook.com
DANE: missing
DNSSEC: active
TLS-RPT: mailto:informatik@bdo.ch
BIMI: missing

Verified services

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

Microsoft 365GoogleTeamViewer

History

18 October 2026 Score 97 · DMARC reject

All changes of this organisation in the change log →

Raw data

bdo.ch. IN MX 10 bdo-ch.mail.protection.outlook.com.
bdo.ch. IN TXT "v=spf1 mx a:securemail2mx.bdo.ch ip4:20.250.176.6 ip4:20.199.180.205 ip4:20.203.165.75 include:spf.protection.outlook.com include:spf.abacuscity.ch include:spf.privasphere.com -all"
_dmarc.bdo.ch. IN TXT "v=DMARC1; p=reject; rua=mailto:informatik@bdo.ch; sp=reject; fo=1; adkim=r; aspf=r"
_mta-sts.bdo.ch. IN TXT "v=STSv1; id=20240222000001Z"
_smtp._tls.bdo.ch. IN TXT "v=TLSRPTv1; rua=mailto:informatik@bdo.ch"

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