Strabag Schweiz

strabag.com

Industry: Construction & real estate
Headquarters: Schlieren, Zurich
Type: private
Employees (approx.): 2,000
Checked on: 19 October 2026

70/100Grade B

Protection against forged senders: protected

Points per criterion

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

Industry avg.: 58.2 ▲ 11.8
Canton avg.: 53 ▲ 17
Overall avg.: 53.5 ▲ 16.5
Rank 17 of 67 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: Microsoft 365
Upstream gateway: Proofpoint
Provider jurisdiction: USA · MX: US
Detection confidence: 99 / 100
Microsoft tenant: Managed · Strabag BRVZ GmbH
Tenant region: EU

Signals (5)

SPF	Microsoft 365	`include:spf.protection.outlook.com`
DKIM	Microsoft 365	`selector1 → selector1-strabag-com._domainkey.stracloud.onmicrosoft.com`
Autodiscover	Microsoft 365	`autodiscover.outlook.com`
Domain verification	Google Workspace	`google-site-verification=W0NzwCp3_EVFOOn`
Entra ID	Microsoft 365	`Entra-ID-Tenant (Managed)`

MX servers

Pref	Host	IP	Network	Country	TLSA
10	`mxb-0015ef02.gslb.pphosted.com`	`91.207.212.173`	AS52129 PROOFPOINT-ASN-EU - Proofpoint, Inc.	US	–
10	`mxa-0015ef02.gslb.pphosted.com`	`91.207.212.173`	AS52129 PROOFPOINT-ASN-EU - Proofpoint, Inc.	US	–

SPF

v=spf1 include:spf-0015ef02.pphosted.com include:_spf.strabag.com include:spf.protection.outlook.com -all

all: -all
DNS lookups: 3 / 10
Includes: spf-0015ef02.pphosted.com_spf.strabag.comspf.protection.outlook.com
Detected sending services: Proofpoint, Microsoft 365

DMARC

v=DMARC1; p=reject; rua=mailto:dmarc.reports@strabag.com,mailto:dmarc_rua@emaildefense.proofpoint.com; ruf=mailto:dmarc_ruf@emaildefense.proofpoint.com

Policy: p=reject
Subdomains (sp): inherits p=reject
Share (pct): 100 %
Alignment DKIM/SPF: relaxed / relaxed
Aggregate reports (rua): dmarc.reports@strabag.comdmarc_rua@emaildefense.proofpoint.com
Forensic reports (ruf): dmarc_ruf@emaildefense.proofpoint.com
Report services: Proofpoint EFD

DKIM

Selector	Key	delegated to
`selector1`	RSA 1024	`selector1-strabag-com._domainkey.stracloud.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.

GoogleMeta/FacebookAtlassianAdobeOneTrust

History

18 October 2026 Score 70 · DMARC reject

All changes of this organisation in the change log →

Raw data

strabag.com. IN MX 10 mxb-0015ef02.gslb.pphosted.com.
strabag.com. IN MX 10 mxa-0015ef02.gslb.pphosted.com.
strabag.com. IN TXT "v=spf1 include:spf-0015ef02.pphosted.com include:_spf.strabag.com include:spf.protection.outlook.com -all"
_dmarc.strabag.com. IN TXT "v=DMARC1; p=reject; rua=mailto:dmarc.reports@strabag.com,mailto:dmarc_rua@emaildefense.proofpoint.com; ruf=mailto:dmarc_ruf@emaildefense.proofpoint.com"

More from this industry

← Back to overview