Gasser Felstechnik

gasser.ch

Industry: Construction & real estate
Headquarters: Lungern, Obwalden
Type: private
Employees (approx.): 500
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.: 53.4 ▲ 10.6
Overall avg.: 53.5 ▲ 10.5
Rank 23 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.

Check live in the Mail DNS Check →

Who runs the mail?

Mailbox provider: Microsoft 365
Upstream gateway: Swisscom Mail Security
Provider jurisdiction: USA · MX: CH, US
Detection confidence: 100 / 100
Microsoft tenant: Managed · gasser.ch
Tenant region: EU

Signals (9)

MX	Microsoft 365	`gasser-ch.mail.protection.outlook.com`
SPF	Microsoft 365	`include:spf.protection.outlook.com`
DKIM	Microsoft 365	`selector1 → selector1-gasser-ch._domainkey.gasserch.onmicrosoft.com`
Autodiscover	Microsoft 365	`autodiscover.outlook.com`
Network	Microsoft 365	`AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation`
MX	Swisscom	`mx01.mailsecurity.swisscom.com`
SPF	Swisscom	`include:mailsecurity.swisscom.com`
Network	Swisscom	`AS3303 SWISSCOM - Swisscom (Schweiz) AG`
Entra ID	Microsoft 365	`Entra-ID-Tenant (Managed)`

MX servers

Pref	Host	IP	Network	Country	TLSA
10	`mx01.mailsecurity.swisscom.com`	`193.135.100.9`	AS3303 SWISSCOM - Swisscom (Schweiz) AG	CH	–
20	`mx02.mailsecurity.swisscom.com`	`193.135.100.29`	AS3303 SWISSCOM - Swisscom (Schweiz) AG	CH	–
100	`gasser-ch.mail.protection.outlook.com`	`52.101.185.13`	AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation	US	–
		`52.101.187.1`	AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation	US
		`52.101.185.12`	AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation	US

SPF

v=spf1 ip4:212.98.61.50 include:_spf.exigomail.ch include:spf.protection.outlook.com include:spf.hornetsecurity.com include:mailsecurity.swisscom.com -all

all: -all
DNS lookups: 5 / 10
Includes: _spf.exigomail.chspf.protection.outlook.comspf.hornetsecurity.commailsecurity.swisscom.com
Detected sending services: Microsoft 365, Hornetsecurity, Swisscom
IPv4: 1 addresses authorised directly

DMARC

v=DMARC1; p=quarantine; rua=mailto:it.support@gasser.ch;

Policy: p=quarantine
Subdomains (sp): inherits p=quarantine
Share (pct): 100 %
Alignment DKIM/SPF: relaxed / relaxed
Aggregate reports (rua): it.support@gasser.ch

DKIM

Selector	Key	delegated to
`selector1`	RSA 2048	`selector1-gasser-ch._domainkey.gasserch.onmicrosoft.com`
`selector2`	RSA 2048	`selector2-gasser-ch._domainkey.gasserch.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: missing

History

19 October 2026 Score 64 · DMARC quarantine

All changes of this organisation in the change log →

Raw data

gasser.ch. IN MX 10 mx01.mailsecurity.swisscom.com.
gasser.ch. IN MX 20 mx02.mailsecurity.swisscom.com.
gasser.ch. IN MX 100 gasser-ch.mail.protection.outlook.com.
gasser.ch. IN TXT "v=spf1 ip4:212.98.61.50 include:_spf.exigomail.ch include:spf.protection.outlook.com include:spf.hornetsecurity.com include:mailsecurity.swisscom.com -all"
_dmarc.gasser.ch. IN TXT "v=DMARC1; p=quarantine; rua=mailto:it.support@gasser.ch;"

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