Rafael Pfister
+41 58 510 22 08 Consulting

Sulzer

sulzer.com

Industry
Machinery & electrical
Headquarters
Winterthur, Zurich
Type
listed
Employees (approx.)
13,000
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

Findings

  • !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.

  • iBIMI logo published

    A brand logo for mail clients is published (without a certificate large providers do not show it).

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 · Sulzer Ltd
Tenant region
EU
Signals (7)
MXMicrosoft 365sulzer-com.mail.protection.outlook.com
SPFMicrosoft 365include:spf.protection.outlook.com
DKIMMicrosoft 365selector1 → selector1-sulzer-com._domainkey.sulzerltd.onmicrosoft.com
AutodiscoverMicrosoft 365autodiscover.outlook.com
NetworkMicrosoft 365AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation
Domain verificationGoogle Workspacegoogle-site-verification=u2KvtcZCnoGVQxt
Entra IDMicrosoft 365Entra-ID-Tenant (Managed)

MX servers

PrefHostIPNetworkCountryTLSA
1 sulzer-com.mail.protection.outlook.com 52.101.91.162 AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation US –
52.101.103.36 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 include:_spf-a.sulzer.com include:_spf-b.sulzer.com include:_spf-c.sulzer.com -all
all
-all
DNS lookups
6 / 10
Includes
_spf-a.sulzer.com_spf-b.sulzer.com_spf-c.sulzer.com
Detected sending services
Microsoft 365, HubSpot

DMARC

v=DMARC1; p=reject; pct=100; rua=mailto:kldnwik0@ag.eu.dmarcian.com, mailto:DMARC.Reporting@sulzer.com;
Policy
p=reject
Subdomains (sp)
inherits p=reject
Share (pct)
100 %
Alignment DKIM/SPF
relaxed / relaxed
Aggregate reports (rua)
kldnwik0@ag.eu.dmarcian.comDMARC.Reporting@sulzer.com
Report services
dmarcian

DKIM

SelectorKeydelegated to
fm1 RSA 2048 fm1-5979-sulzer-com.fmdkim.net
fm2 RSA 2048 fm2-5979-sulzer-com.fmdkim.net
k1 RSA 1024 –
k2 RSA 2048 dkim2.mcsv.net
k3 RSA 2048 dkim3.mcsv.net
m1 RSA 1024 –
mail RSA 1024 mail._domainkey.sendinblue.com
mailjet RSA 1024 –
mandrill RSA 1024 –
mx RSA 2048 mx._domainkey.mail1.wpengine.com
s1 RSA 2048 s1.domainkey.u9930915.wl166.sendgrid.net
s2 RSA 1024 s2.domainkey.u9930915.wl166.sendgrid.net
selector1 RSA 2048 selector1-sulzer-com._domainkey.sulzerltd.onmicrosoft.com
selector2 RSA 2048 selector2-sulzer-com._domainkey.sulzerltd.onmicrosoft.com
smtpapi RSA 1024 smtpapi._domainkey.sendgrid.net

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

Transport encryption

MTA-STS
missing
DANE
missing
DNSSEC
missing
TLS-RPT
missing
BIMI
without certificate · Logo

Verified services

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

GoogleAppleMiroCanvaAutodesk

History

  • Score 70 · DMARC reject

All changes of this organisation in the change log →

Raw data 
sulzer.com. IN MX 1 sulzer-com.mail.protection.outlook.com.
sulzer.com. IN TXT "v=spf1 include:_spf-a.sulzer.com include:_spf-b.sulzer.com include:_spf-c.sulzer.com -all"
_dmarc.sulzer.com. IN TXT "v=DMARC1; p=reject; pct=100; rua=mailto:kldnwik0@ag.eu.dmarcian.com, mailto:DMARC.Reporting@sulzer.com;"
default._bimi.sulzer.com. IN TXT "v=BIMI1; l=https://go.sulzer.com/icon-sulzer-blue"

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