Holcim

holcim.com

Industry: Building materials
Headquarters: Zug, Zug
Type: listed
Employees (approx.): 48,000
Checked on: 19 October 2026

68/100Grade B

Protection against forged senders: protected

Points per criterion

MX 10 / 10
SPF 13 / 15
DKIM 20 / 20
DMARC 25 / 25
DNSSEC 0 / 10
Transport (MTA-STS/DANE) 0 / 15
TLS-RPT 0 / 5

Industry avg.: 60.3 ▲ 7.7
Canton avg.: 63.2 ▲ 4.8
Overall avg.: 53.5 ▲ 14.5
Rank 9 of 20 in the industry

Findings

!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: Google Workspace
Provider jurisdiction: USA · MX: US
Detection confidence: 96 / 100
Microsoft tenant: Federated · Holcim Group Services Ltd
Tenant region: EU
Federated via: accounts.google.com

Signals (7)

Domain verification	Microsoft 365	`MS=ms19731080`
MX	Google Workspace	`aspmx.l.google.com`
SPF	Google Workspace	`include:_spf.google.com`
DKIM	Google Workspace	`google`
Domain verification	Google Workspace	`google-site-verification=PDHhpbJsWEQoznH`
Network	Google Workspace	`AS15169 GOOGLE - Google LLC`
Entra ID	Microsoft 365	`Entra-ID-Tenant (Federated)`

MX servers

Pref	Host	IP	Network	Country	TLSA
1	`aspmx.l.google.com`	`142.251.127.26`	AS15169 GOOGLE - Google LLC	US	–
5	`alt1.aspmx.l.google.com`	`142.250.147.27`	AS15169 GOOGLE - Google LLC	US	–
5	`alt2.aspmx.l.google.com`	`172.253.152.26`	AS15169 GOOGLE - Google LLC	US	–
10	`aspmx2.googlemail.com`	`142.250.147.26`	AS15169 GOOGLE - Google LLC	US	–
10	`aspmx3.googlemail.com`	`172.253.152.27`	AS15169 GOOGLE - Google LLC	US	–

SPF

v=spf1 include:_spf.google.com include:spf.privasphere.com include:mailcontrol.com include:spf1.lafargeholcim.com ~all

all: ~all
DNS lookups: 5 / 10
Includes: _spf.google.comspf.privasphere.commailcontrol.comspf1.lafargeholcim.com
Detected sending services: Google

DMARC

v=DMARC1;p=reject;rua=mailto:mailsecurity@lafargeholcim.com

Policy: p=reject
Subdomains (sp): inherits p=reject
Share (pct): 100 %
Alignment DKIM/SPF: relaxed / relaxed
Aggregate reports (rua): mailsecurity@lafargeholcim.com

DKIM

Selector	Key	delegated to
`google`	RSA 1024	–
`mta`	RSA 1024	–
`s1`	RSA 2048	`s1.domainkey.u76780.wl031.sendgrid.net`
`s2`	RSA 1024	`s2.domainkey.u76780.wl031.sendgrid.net`

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 365GoogleAppleAtlassianDocuSignZoomCisco WebexOneTrustMiroKnowBe4Smartsheet

History

18 October 2026 Score 68 · DMARC reject

All changes of this organisation in the change log →

Raw data

holcim.com. IN MX 1 aspmx.l.google.com.
holcim.com. IN MX 5 alt1.aspmx.l.google.com.
holcim.com. IN MX 5 alt2.aspmx.l.google.com.
holcim.com. IN MX 10 aspmx2.googlemail.com.
holcim.com. IN MX 10 aspmx3.googlemail.com.
holcim.com. IN TXT "v=spf1 include:_spf.google.com include:spf.privasphere.com include:mailcontrol.com include:spf1.lafargeholcim.com ~all"
_dmarc.holcim.com. IN TXT "v=DMARC1;p=reject;rua=mailto:mailsecurity@lafargeholcim.com"

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