c-alm

c-alm.ch

Industry: Consulting & audit
Headquarters: St. Gallen, St. Gallen
Type: private
Checked on: 19 October 2026

80/100Grade B

Protection against forged senders: protected

Points per criterion

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

Industry avg.: 66.8 ▲ 13.2
Canton avg.: 52.3 ▲ 27.7
Overall avg.: 53.5 ▲ 26.5
Rank 7 of 45 in the industry

Findings

!DKIM key below 2048 bits

RSA-1024 is considered too weak (RFC 8301, M3AAWG). Rotate to 2048-bit keys.
!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.
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 · c-alm AG
Tenant region: EU

Signals (8)

MX	Microsoft 365	`calm-ch0c.mail.protection.outlook.com`
SPF	Microsoft 365	`include:spf.protection.outlook.com`
DKIM	Microsoft 365	`selector1 → selector1-calm-ch0c._domainkey.itcalm.onmicrosoft.com`
Autodiscover	Microsoft 365	`autodiscover.outlook.com`
Domain verification	Microsoft 365	`MS=ms47821951`
Network	Microsoft 365	`AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation`
Domain verification	Google Workspace	`google-site-verification=GDuNpAqmkMTPDqr`
Entra ID	Microsoft 365	`Entra-ID-Tenant (Managed)`

MX servers

Pref	Host	IP	Network	Country	TLSA
0	`calm-ch0c.mail.protection.outlook.com`	`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
		`52.101.185.13`	AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation	US

SPF

v=spf1 +ip4:45.131.252.39 +ip4:213.144.134.98 +ip4:212.25.23.50 +ip4:109.202.198.235 +ip4:212.25.15.54 include:spf.protection.outlook.com include:_spf.createsend.com -all

all: -all
DNS lookups: 2 / 10
Includes: spf.protection.outlook.com_spf.createsend.com
Detected sending services: Microsoft 365
IPv4: 5 addresses authorised directly

DMARC

v=DMARC1; p=reject; sp=reject; aspf=s; adkim=s; rua=mailto:04d2af4113e84497940993140fa4d6c8@dmarc-reports.cloudflare.net

Policy: p=reject
Subdomains (sp): reject
Share (pct): 100 %
Alignment DKIM/SPF: strict / strict
Aggregate reports (rua): 04d2af4113e84497940993140fa4d6c8@dmarc-reports.cloudflare.net
Report services: Cloudflare

DKIM

Selector	Key	delegated to
`cm`	RSA 1024	–
`selector1`	RSA 2048	`selector1-calm-ch0c._domainkey.itcalm.onmicrosoft.com`
`selector2`	RSA 2048	`selector2-calm-ch0c._domainkey.itcalm.onmicrosoft.com`

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

Transport encryption

MTA-STS: missing
DANE: missing
DNSSEC: active
TLS-RPT: missing
BIMI: without certificate · Logo

Verified services

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

Microsoft 365GoogleAtlassian

History

19 October 2026 Score 80 · DMARC reject

All changes of this organisation in the change log →

Raw data

c-alm.ch. IN MX 0 calm-ch0c.mail.protection.outlook.com.
c-alm.ch. IN TXT "v=spf1 +ip4:45.131.252.39 +ip4:213.144.134.98 +ip4:212.25.23.50 +ip4:109.202.198.235 +ip4:212.25.15.54 include:spf.protection.outlook.com include:_spf.createsend.com -all"
_dmarc.c-alm.ch. IN TXT "v=DMARC1; p=reject; sp=reject; aspf=s; adkim=s; rua=mailto:04d2af4113e84497940993140fa4d6c8@dmarc-reports.cloudflare.net"
default._bimi.c-alm.ch. IN TXT "v=BIMI1; l=https://cdn.website.prod.eng.c-alm.ch/c-alm_BIMI.svg"

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