Swiss Prime Site

sps.swiss

Industry: Construction & real estate
Headquarters: Zug, Zug
Type: listed
Employees (approx.): 800
Checked on: 19 October 2026

74/100Grade B

Protection against forged senders: largely protected

Points per criterion

MX 10 / 10
SPF 15 / 15
DKIM 20 / 20
DMARC 19 / 25
DNSSEC 10 / 10
Transport (MTA-STS/DANE) 0 / 15
TLS-RPT 0 / 5

Industry avg.: 58.2 ▲ 15.8
Canton avg.: 63.2 ▲ 10.8
Overall avg.: 53.5 ▲ 20.5
Rank 7 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.
!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 · Swiss Prime Site Management AG
Tenant region: EU

Signals (7)

MX	Microsoft 365	`sps-swiss.mail.protection.outlook.com`
SPF	Microsoft 365	`include:spf.protection.outlook.com`
DKIM	Microsoft 365	`selector1 → selector1-sps-swiss._domainkey.spsag.onmicrosoft.com`
Autodiscover	Microsoft 365	`autodiscover.outlook.com`
Domain verification	Microsoft 365	`MS=ms12715021`
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	`sps-swiss.mail.protection.outlook.com`	`52.101.187.1`	AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation	US	–
		`52.101.185.14`	AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation	US
		`52.101.185.12`	AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation	US

SPF

v=spf1 a ip4:185.157.0.171 include:spf.eu.exclaimer.net include:spf.protection.outlook.com -all

all: -all
DNS lookups: 3 / 10
Includes: spf.eu.exclaimer.netspf.protection.outlook.com
Detected sending services: Microsoft 365
IPv4: 1 addresses authorised directly

DMARC

v=DMARC1; p=quarantine; pct=100; rua=mailto:dmarc-aggregate@sps.swiss; ruf=mailto:dmarc-forensik@sps.swiss

Policy: p=quarantine
Subdomains (sp): inherits p=quarantine
Share (pct): 100 %
Alignment DKIM/SPF: relaxed / relaxed
Aggregate reports (rua): dmarc-aggregate@sps.swiss
Forensic reports (ruf): dmarc-forensik@sps.swiss

DKIM

Selector	Key	delegated to
`k1`	RSA 1024	`dkim.mcsv.net`
`mandrill`	RSA 1024	–
`s1`	RSA 2048	`s1.domainkey.u54289927.wl178.sendgrid.net`
`s2`	RSA 2048	`s2.domainkey.u54289927.wl178.sendgrid.net`
`selector1`	RSA 1024	`selector1-sps-swiss._domainkey.spsag.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: missing

Verified services

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

Microsoft 365Brevo

History

18 October 2026 Score 74 · DMARC quarantine

All changes of this organisation in the change log →

Raw data

sps.swiss. IN MX 0 sps-swiss.mail.protection.outlook.com.
sps.swiss. IN TXT "v=spf1 a ip4:185.157.0.171 include:spf.eu.exclaimer.net include:spf.protection.outlook.com -all"
_dmarc.sps.swiss. IN TXT "v=DMARC1; p=quarantine; pct=100; rua=mailto:dmarc-aggregate@sps.swiss; ruf=mailto:dmarc-forensik@sps.swiss"

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