Senn

senn.com

Industry: Construction & real estate
Headquarters: St. Gallen, St. Gallen
Type: private
Employees (approx.): 200
Checked on: 19 October 2026

64/100Grade C

Protection against forged senders: largely protected

Points per criterion

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

Industry avg.: 58.2 ▲ 5.8
Canton avg.: 52.3 ▲ 11.7
Overall avg.: 53.5 ▲ 10.5
Rank 27 of 67 in the industry

Findings

!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 · Senn-Gruppe
Tenant region: EU

Signals (8)

MX	Microsoft 365	`senn-com.mail.protection.outlook.com`
SPF	Microsoft 365	`include:spf.protection.outlook.com`
DKIM	Microsoft 365	`selector1 → selector1-senn-com._domainkey.senngrp.onmicrosoft.com`
Autodiscover	Microsoft 365	`autodiscover.outlook.com`
Domain verification	Microsoft 365	`MS=ms49114874`
Network	Microsoft 365	`AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation`
Domain verification	Google Workspace	`google-site-verification=AJtbTb_d8kdC_nz`
Entra ID	Microsoft 365	`Entra-ID-Tenant (Managed)`

MX servers

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

SPF

v=spf1 +a +mx  +ip4:31.25.126.58 +ip4:109.164.230.166 +ip4:46.20.47.88 +ip4:46.20.47.90 +ip4:46.20.47.91 +ip4:46.20.47.92 +ip4:46.20.47.93 +ip4:46.20.47.94 +ip4:85.14.241.66 +ip4:85.14.241.67 +ip4:85.14.241.68 +ip4:85.14.241.69 +ip4:85.14.241.70 a:sen-fw01.senn.com include:spf.protection.outlook.com include:spf.protection.cyon.net include:spf-de.emailsignatures365.com -all

all: -all
DNS lookups: 6 / 10
Includes: spf.protection.outlook.comspf.protection.cyon.netspf-de.emailsignatures365.com
Detected sending services: Microsoft 365
IPv4: 13 addresses authorised directly

DMARC

v=DMARC1; p=quarantine; sp=quarantine; rua=mailto:mz8nfnhksl@rua.powerdmarc.com; ruf=mailto:mz8nfnhksl@ruf.powerdmarc.com; fo=1; t=n;

Policy: p=quarantine
Subdomains (sp): quarantine
Share (pct): 100 %
Alignment DKIM/SPF: relaxed / relaxed
Aggregate reports (rua): mz8nfnhksl@rua.powerdmarc.com
Forensic reports (ruf): mz8nfnhksl@ruf.powerdmarc.com
Report services: PowerDMARC

DKIM

Selector	Key	delegated to
`default`	RSA 2048	–
`k2`	RSA 2048	`dkim2.mcsv.net`
`k3`	RSA 2048	`dkim3.mcsv.net`
`selector1`	RSA 2048	`selector1-senn-com._domainkey.senngrp.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: without certificate · Logo

Verified services

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

Microsoft 365Google

History

19 October 2026 Score 64 · DMARC quarantine

All changes of this organisation in the change log →

Raw data

senn.com. IN MX 10 senn-com.mail.protection.outlook.com.
senn.com. IN TXT "v=spf1 +a +mx  +ip4:31.25.126.58 +ip4:109.164.230.166 +ip4:46.20.47.88 +ip4:46.20.47.90 +ip4:46.20.47.91 +ip4:46.20.47.92 +ip4:46.20.47.93 +ip4:46.20.47.94 +ip4:85.14.241.66 +ip4:85.14.241.67 +ip4:85.14.241.68 +ip4:85.14.241.69 +ip4:85.14.241.70 a:sen-fw01.senn.com include:spf.protection.outlook.com include:spf.protection.cyon.net include:spf-de.emailsignatures365.com -all"
_dmarc.senn.com. IN TXT "v=DMARC1; p=quarantine; sp=quarantine; rua=mailto:mz8nfnhksl@rua.powerdmarc.com; ruf=mailto:mz8nfnhksl@ruf.powerdmarc.com; fo=1; t=n;"
default._bimi.senn.com. IN TXT "v=BIMI1; l=https://hostedbimi.com/73704/cad24bc9-4923-471a-8feb-449cebeec6cb.svg"

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