Cellere

cellere.ch

Industry: Construction & real estate
Headquarters: St. Gallen, St. Gallen
Type: private
Employees (approx.): 1,100
Checked on: 19 October 2026

64/100Grade C

Protection against forged senders: largely protected, with a gap: subdomains not protected (sp=none)

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 19 of 67 in the industry

Findings

!Subdomains unprotected (sp=none)

The main domain is protected, but subdomains such as invoice.company.ch can still be forged.
!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 · Cellere Verwaltungs AG
Tenant region: EU

Signals (9)

MX	Microsoft 365	`cellere-ch.mail.protection.outlook.com`
SPF	Microsoft 365	`include:spf.protection.outlook.com`
DKIM	Microsoft 365	`selector1 → selector1-cellere-ch._domainkey.cellere.onmicrosoft.com`
Autodiscover	Microsoft 365	`autodiscover.outlook.com`
Network	Microsoft 365	`AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation`
Domain verification	Google Workspace	`google-site-verification=GYpdWc0fYI5IFoT`
SPF	Amazon	`include:amazonses.com`
Network	Amazon	`AS16509 AMAZON-02 - Amazon.com, Inc.`
Entra ID	Microsoft 365	`Entra-ID-Tenant (Managed)`

MX servers

Pref	Host	IP	Network	Country	TLSA
0	`cellere-ch.mail.protection.outlook.com`	`52.101.91.21`	AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation	US	–
		`52.101.68.21`	AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation	US
		`52.101.181.153`	AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation	US
10	`feedback-smtp.eu-west-1.amazonses.com`	`34.250.195.198`	AS16509 AMAZON-02 - Amazon.com, Inc.	US	–
		`34.243.41.226`	AS16509 AMAZON-02 - Amazon.com, Inc.	US
		`18.200.42.95`	AS16509 AMAZON-02 - Amazon.com, Inc.	US

SPF

v=spf1 a mx ip4:20.250.91.83 ip4:83.144.236.66 ip4:83.144.236.84 ip4:83.144.236.73 ip4:194.126.200.64 include:spf.crsend.com include:servers.mcsv.net include:spf.protection.outlook.com include:spf.protection.cyon.net include:amazonses.com -all

all: -all
DNS lookups: 7 / 10
Includes: spf.crsend.comservers.mcsv.netspf.protection.outlook.comspf.protection.cyon.netamazonses.com
Detected sending services: Mailchimp/Mandrill, Microsoft 365, Amazon SES
IPv4: 5 addresses authorised directly

DMARC

v=DMARC1; p=quarantine; sp=none; rua=mailto:support@cellere.ch; ruf=mailto:support@cellere.ch; rf=afrf; pct=100; ri=86400

Policy: p=quarantine
Subdomains (sp): none
Share (pct): 100 %
Alignment DKIM/SPF: relaxed / relaxed
Aggregate reports (rua): support@cellere.ch
Forensic reports (ruf): support@cellere.ch

DKIM

Selector	Key	delegated to
`k2`	RSA 2048	`dkim2.mcsv.net`
`k3`	RSA 2048	`dkim3.mcsv.net`
`s1`	RSA 2048	`s1.domainkey.u33918809.wl060.sendgrid.net`
`s2`	RSA 2048	`s2.domainkey.u33918809.wl060.sendgrid.net`
`selector1`	RSA 1024	`selector1-cellere-ch._domainkey.cellere.onmicrosoft.com`
`selector2`	RSA 1024	`selector2-cellere-ch._domainkey.cellere.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.

Google

History

18 October 2026 Score 64 · DMARC quarantine

All changes of this organisation in the change log →

Raw data

cellere.ch. IN MX 0 cellere-ch.mail.protection.outlook.com.
cellere.ch. IN MX 10 feedback-smtp.eu-west-1.amazonses.com.
cellere.ch. IN TXT "v=spf1 a mx ip4:20.250.91.83 ip4:83.144.236.66 ip4:83.144.236.84 ip4:83.144.236.73 ip4:194.126.200.64 include:spf.crsend.com include:servers.mcsv.net include:spf.protection.outlook.com include:spf.protection.cyon.net include:amazonses.com -all"
_dmarc.cellere.ch. IN TXT "v=DMARC1; p=quarantine; sp=none; rua=mailto:support@cellere.ch; ruf=mailto:support@cellere.ch; rf=afrf; pct=100; ri=86400"

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