Amstein + Walthert

amstein-walthert.ch

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

59/100Grade C

Protection against forged senders: largely protected

Points per criterion

MX 10 / 10
SPF 0 / 15
DKIM 20 / 20
DMARC 19 / 25
DNSSEC 10 / 10
Transport (MTA-STS/DANE) 0 / 15
TLS-RPT 0 / 5

Industry avg.: 58.2 ▲ 0.8
Canton avg.: 53 ▲ 6
Overall avg.: 53.5 ▲ 5.5
Rank 35 of 67 in the industry

Findings

✕SPF exceeds 10 DNS lookups (11)

More than ten lookups (include, a, mx, ptr, exists, redirect) cause a permerror; many receivers then treat SPF as failed.
!DKIM key below 2048 bits

RSA-1024 is considered too weak (RFC 8301, M3AAWG). Rotate to 2048-bit keys.
!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 · Amstein + Walthert AG
Tenant region: EU

Signals (6)

MX	Microsoft 365	`amsteinwalthert-ch01i.mail.protection.outlook.com`
SPF	Microsoft 365	`include:spf.protection.outlook.com`
DKIM	Microsoft 365	`selector2 → selector2-amsteinwalthert-ch01i._domainkey.amwacloud.onmicrosoft.com`
Autodiscover	Microsoft 365	`autodiscover.outlook.com`
Network	Microsoft 365	`AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation`
Entra ID	Microsoft 365	`Entra-ID-Tenant (Managed)`

MX servers

Pref	Host	IP	Network	Country	TLSA
10	`amsteinwalthert-ch01i.mail.protection.outlook.com`	`52.101.73.145`	AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation	US	–
		`52.101.103.39`	AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation	US
		`52.101.103.143`	AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation	US

SPF

v=spf1 ip4:185.157.0.45/32 a:spf1.refline.ch a:spf2.refline.ch include:_spf.jpberlin.de include:spf.protection.outlook.com include:spf.crsend.com include:spf.abacuscity.ch include:mailgun.org -all

all: -all
DNS lookups: 11 / 10
Includes: _spf.jpberlin.despf.protection.outlook.comspf.crsend.comspf.abacuscity.chmailgun.org
Detected sending services: Microsoft 365, Mailgun
IPv4: 1 addresses authorised directly

DMARC

v=DMARC1; p=quarantine; pct=100; rua=mailto:dmarc@amstein-walthert.ch; ruf=mailto:dmarc@amstein-walthert.ch; fo=1

Policy: p=quarantine
Subdomains (sp): inherits p=quarantine
Share (pct): 100 %
Alignment DKIM/SPF: relaxed / relaxed
Aggregate reports (rua): dmarc@amstein-walthert.ch
Forensic reports (ruf): dmarc@amstein-walthert.ch

DKIM

Selector	Key	delegated to
`selector2`	RSA 1024	`selector2-amsteinwalthert-ch01i._domainkey.amwacloud.onmicrosoft.com`

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

Transport encryption

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

History

19 October 2026 Score 59 · DMARC quarantine

All changes of this organisation in the change log →

Raw data

amstein-walthert.ch. IN MX 10 amsteinwalthert-ch01i.mail.protection.outlook.com.
amstein-walthert.ch. IN TXT "v=spf1 ip4:185.157.0.45/32 a:spf1.refline.ch a:spf2.refline.ch include:_spf.jpberlin.de include:spf.protection.outlook.com include:spf.crsend.com include:spf.abacuscity.ch include:mailgun.org -all"
_dmarc.amstein-walthert.ch. IN TXT "v=DMARC1; p=quarantine; pct=100; rua=mailto:dmarc@amstein-walthert.ch; ruf=mailto:dmarc@amstein-walthert.ch; fo=1"

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