Güdel

gudel.com

Industry: Machinery & electrical
Headquarters: Langenthal, Bern
Type: private
Employees (approx.): 400
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.: 62.2 ▲ 1.8
Canton avg.: 53.1 ▲ 10.9
Overall avg.: 53.5 ▲ 10.5
Rank 57 of 112 in the industry

Findings

!SPF close to the 10-lookup limit (9)

One more sending service can break the limit. Flattening or subdomains for third parties create headroom.
!SPF authorises very large IP ranges (223,746)

The SPF record itself lists IPv4 ranges with more than 65,000 addresses. The wider the range, the easier it is for third parties to send from an authorised network.
!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.

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 · Güdel AG
Tenant region: EU

Signals (6)

MX	Microsoft 365	`gudel-com.mail.protection.outlook.com`
SPF	Microsoft 365	`include:spf.protection.outlook.com`
DKIM	Microsoft 365	`selector1 → selector1-gudel-com._domainkey.gudel.onmicrosoft.com`
Domain verification	Microsoft 365	`MS=ms93171165`
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
0	`gudel-com.mail.protection.outlook.com`	`52.101.73.126`	AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation	US	–
		`52.101.209.28`	AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation	US
		`52.101.181.153`	AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation	US

SPF

v=spf1 a mx include:spf.protection.outlook.com include:servers.mcsv.net include:spf.protection.codata.swiss include:spf.salesforce.com include:successfactors.eu ip4:173.236.20.0/24 ip4:192.92.97.0/24 ip4:52.128.40.0/21 ip4:217.8.118.0/24 ip4:103.229.233.0/24 ip4:176.9.0.19 ip4:213.221.200.155 ip4:167.89.0.0/17 ip4:208.117.48.0/20 ip4:50.31.32.0/19 ip4:198.37.144.0/20 ip4:198.21.0.0/21 ip4:192.254.112.0/20 ip4:168.245.0.0/17 ip4:149.72.0.0/16 ip4:159.183.0.0/16 ip4:223.165.113.0/24 ip4:223.165.115.0/24 ip4:223.165.118.0/23 ip4:223.165.120.0/23 -all

all: -all
DNS lookups: 9 / 10
Includes: spf.protection.outlook.comservers.mcsv.netspf.protection.codata.swissspf.salesforce.comsuccessfactors.eu
Detected sending services: Microsoft 365, Mailchimp/Mandrill, Salesforce, SAP
IPv4: 223,746 addresses authorised directly

DMARC

v=DMARC1;p=quarantine;rua=mailto:dmarc.rua@gudel.com,mailto:dmarc_agg@vali.email;fo=1

Policy: p=quarantine
Subdomains (sp): inherits p=quarantine
Share (pct): 100 %
Alignment DKIM/SPF: relaxed / relaxed
Aggregate reports (rua): dmarc.rua@gudel.comdmarc_agg@vali.email

DKIM

Selector	Key	delegated to
`dk`	RSA 1024	–
`s1`	RSA 2048	`s1.domainkey.u18858631.wl132.sendgrid.net`
`s2`	RSA 1024	`s2.domainkey.u18858631.wl132.sendgrid.net`
`selector1`	RSA 2048	`selector1-gudel-com._domainkey.gudel.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

Verified services

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

Microsoft 365AppleKnowBe4

History

19 October 2026 Score 64 · DMARC quarantine

All changes of this organisation in the change log →

Raw data

gudel.com. IN MX 0 gudel-com.mail.protection.outlook.com.
gudel.com. IN TXT "v=spf1 a mx include:spf.protection.outlook.com include:servers.mcsv.net include:spf.protection.codata.swiss include:spf.salesforce.com include:successfactors.eu ip4:173.236.20.0/24 ip4:192.92.97.0/24 ip4:52.128.40.0/21 ip4:217.8.118.0/24 ip4:103.229.233.0/24 ip4:176.9.0.19 ip4:213.221.200.155 ip4:167.89.0.0/17 ip4:208.117.48.0/20 ip4:50.31.32.0/19 ip4:198.37.144.0/20 ip4:198.21.0.0/21 ip4:192.254.112.0/20 ip4:168.245.0.0/17 ip4:149.72.0.0/16 ip4:159.183.0.0/16 ip4:223.165.113.0/24 ip4:223.165.115.0/24 ip4:223.165.118.0/23 ip4:223.165.120.0/23 -all"
_dmarc.gudel.com. IN TXT "v=DMARC1;p=quarantine;rua=mailto:dmarc.rua@gudel.com,mailto:dmarc_agg@vali.email;fo=1"

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