Rafael Pfister
+41 58 510 22 08 Consulting

Sensirion

sensirion.com

Industry
Machinery & electrical
Headquarters
Stäfa, Zurich
Type
listed
Employees (approx.)
1,100
Checked on
19 October 2026
82/100Grade 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) 12 / 15
  • TLS-RPT 0 / 5

Findings

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

    One more sending service can break the limit. Flattening or subdomains for third parties create headroom.

  • !DMARC without reporting (no rua)

    Without aggregate reports it stays invisible who sends in the domain's name.

  • !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.

  • iStrict DMARC alignment

    adkim=s or aspf=s requires exact domain matches. Secure, but demanding when sending from subdomains.

  • iDANE active (TLSA with DNSSEC)

    All MX hosts publish TLSA records secured by DNSSEC.

Check live in the Mail DNS Check →

Who runs the mail?

Mailbox provider
Microsoft 365
Upstream gateway
NoSpamProxy
Provider jurisdiction
USA · MX: DE
Detection confidence
99 / 100
Microsoft tenant
Managed · Sensirion
Tenant region
EU
Signals (6)
SPFMicrosoft 365include:spf.protection.outlook.com
DKIMMicrosoft 365selector1 → selector1-sensirion-com._domainkey.sensinet.onmicrosoft.com
AutodiscoverMicrosoft 365autodiscover.outlook.com
Domain verificationGoogle Workspacegoogle-site-verification=MxL0XeTJZaJ-97t
NetworkAmazonAS16509 AMAZON-02 - Amazon.com, Inc.
Entra IDMicrosoft 365Entra-ID-Tenant (Managed)

MX servers

PrefHostIPNetworkCountryTLSA
10 sensirion-com.mail.cloud.nospamproxy.com 178.212.92.66 AS16509 AMAZON-02 - Amazon.com, Inc. DE ✓ DNSSEC
193.37.132.21 AS16509 AMAZON-02 - Amazon.com, Inc. DE

SPF

v=spf1 ip4:77.245.23.204 include:cust-spf.exacttarget.com include:spf.protection.outlook.com include:spf.umantis.com include:spf.mailjet.com include:successfactors.eu include:_spf.salesforce.com  include:spf.sensirion-com.cloud.nospamproxy.com include:_spf.psm.knowbe4.com -all
all
-all
DNS lookups
10 / 10
Includes
cust-spf.exacttarget.comspf.protection.outlook.comspf.umantis.comspf.mailjet.comsuccessfactors.eu_spf.salesforce.comspf.sensirion-com.cloud.nospamproxy.com_spf.psm.knowbe4.com
Detected sending services
Salesforce, Microsoft 365, Mailjet, SAP
IPv4
1 addresses authorised directly

DMARC

v=DMARC1;p=reject;adkim=s;aspf=r
Policy
p=reject
Subdomains (sp)
inherits p=reject
Share (pct)
100 %
Alignment DKIM/SPF
strict / relaxed
Aggregate reports (rua)
–

DKIM

SelectorKeydelegated to
cm RSA 1024 –
mailjet RSA 1024 –
selector1 RSA 1024 selector1-sensirion-com._domainkey.sensinet.onmicrosoft.com

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

Transport encryption

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

Verified services

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

GoogleAppleAtlassianDocuSignOneTrustSlack

History

  • Score 82 · DMARC reject

All changes of this organisation in the change log →

Raw data 
sensirion.com. IN MX 10 sensirion-com.mail.cloud.nospamproxy.com.
sensirion.com. IN TXT "v=spf1 ip4:77.245.23.204 include:cust-spf.exacttarget.com include:spf.protection.outlook.com include:spf.umantis.com include:spf.mailjet.com include:successfactors.eu include:_spf.salesforce.com  include:spf.sensirion-com.cloud.nospamproxy.com include:_spf.psm.knowbe4.com -all"
_dmarc.sensirion.com. IN TXT "v=DMARC1;p=reject;adkim=s;aspf=r"

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