WTW Schweiz

wtwco.com

Industry: Consulting & audit
Headquarters: Zürich, Zurich
Type: listed
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.: 66.8 ▲ 1.2
Canton avg.: 53 ▲ 15
Overall avg.: 53.5 ▲ 14.5
Rank 27 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.
!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: 86 / 100
Microsoft tenant: Managed · Willis Towers Watson
Tenant region: NA

Signals (6)

MX	Microsoft 365	`willistowerswatson-com.mail.protection.outlook.com`
DKIM	Microsoft 365	`selector1 → selector1-wtwco-com._domainkey.twonline.onmicrosoft.com`
Domain verification	Microsoft 365	`MS=ms82656166`
Network	Microsoft 365	`AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation`
Domain verification	Google Workspace	`google-site-verification=GpQt9W2M5FyjE6p`
Entra ID	Microsoft 365	`Entra-ID-Tenant (Managed)`

MX servers

Pref	Host	IP	Network	Country	TLSA
10	`willistowerswatson-com.mail.protection.outlook.com`	`52.101.10.16`	AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation	US	–
		`52.101.194.3`	AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation	US
		`52.101.42.84`	AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation	US

SPF

v=spf1 include:%{i}._ip.%{h}._ehlo.%{d}._spf.vali.email ~all

all: ~all
DNS lookups: 1 / 10

DMARC

v=DMARC1; p=reject; fo=1; rua=mailto:dmarc_agg@vali.email

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

DKIM

Selector	Key	delegated to
`k2`	RSA 2048	`dkim2.mcsv.net`
`k3`	RSA 2048	`dkim3.mcsv.net`
`m1`	RSA 1024	–
`s1`	RSA 2048	`s1.domainkey.u16932043.wl044.sendgrid.net`
`s2`	RSA 2048	`s2.domainkey.u16932043.wl044.sendgrid.net`
`s3`	RSA 2048	`s3.domainkey.u12097671.wl172.sendgrid.net`
`selector1`	RSA 2048	`selector1-wtwco-com._domainkey.twonline.onmicrosoft.com`
`sfdc`	RSA 2048	`sfdc.sqx0di.custdkim.salesforce.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.

Microsoft 365GoogleMeta/FacebookAtlassianDocuSignAdobeCisco WebexGlobalSignOneTrustMiroAirtableSmartsheet

History

19 October 2026 Score 68 · DMARC reject

All changes of this organisation in the change log →

Raw data

wtwco.com. IN MX 10 willistowerswatson-com.mail.protection.outlook.com.
wtwco.com. IN TXT "v=spf1 include:%{i}._ip.%{h}._ehlo.%{d}._spf.vali.email ~all"
_dmarc.wtwco.com. IN TXT "v=DMARC1; p=reject; fo=1; rua=mailto:dmarc_agg@vali.email"

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