Schellenberg Wittmer

swlegal.ch

Industry: Consulting & audit
Headquarters: Zürich, Zurich
Type: private
Employees (approx.): 300
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.: 66.8 ▲ 7.2
Canton avg.: 53 ▲ 21
Overall avg.: 53.5 ▲ 20.5
Rank 16 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.

Check live in the Mail DNS Check →

Who runs the mail?

Mailbox provider: Self-hosted / other
Provider jurisdiction: Switzerland · MX: CH
Detection confidence: 85 / 100
Microsoft tenant: Managed · Schellenberg Wittmer
Tenant region: EU

Signals (2)

SPF	Microsoft 365	`include:spf.protection.outlook.com`
Entra ID	Microsoft 365	`Entra-ID-Tenant (Managed)`

MX servers

Pref	Host	IP	Network	Country	TLSA
10	`swl-mx202.swlegal.ch`	`193.169.187.242`	AS8453 ECONIS-AS - WIIT Schweiz AG	CH	–
10	`swl-mx102.swlegal.ch`	`193.169.187.243`	AS8453 ECONIS-AS - WIIT Schweiz AG	CH	–

SPF

v=spf1 mx:swlegal.ch ip4:193.169.187.242 ip4:193.169.187.243 include:spf.protection.outlook.com include:_spf.rexx-systems.com -all

all: -all
DNS lookups: 3 / 10
Includes: spf.protection.outlook.com_spf.rexx-systems.com
Detected sending services: Microsoft 365
IPv4: 2 addresses authorised directly

DMARC

v=DMARC1; p=quarantine; sp=quarantine; rua=mailto:dmarc@swlegal.ch; ruf=mailto:dmarc@swlegal.ch; fo=0; adkim=r; aspf=r; pct=100; rf=afrf; ri=86400

Policy: p=quarantine
Subdomains (sp): quarantine
Share (pct): 100 %
Alignment DKIM/SPF: relaxed / relaxed
Aggregate reports (rua): dmarc@swlegal.ch
Forensic reports (ruf): dmarc@swlegal.ch

DKIM

Selector	Key	delegated to
`selector1`	RSA 1024	–

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.

Atlassian

History

18 October 2026 Score 74 · DMARC quarantine

All changes of this organisation in the change log →

Raw data

swlegal.ch. IN MX 10 swl-mx202.swlegal.ch.
swlegal.ch. IN MX 10 swl-mx102.swlegal.ch.
swlegal.ch. IN TXT "v=spf1 mx:swlegal.ch ip4:193.169.187.242 ip4:193.169.187.243 include:spf.protection.outlook.com include:_spf.rexx-systems.com -all"
_dmarc.swlegal.ch. IN TXT "v=DMARC1; p=quarantine; sp=quarantine; rua=mailto:dmarc@swlegal.ch; ruf=mailto:dmarc@swlegal.ch; fo=0; adkim=r; aspf=r; pct=100; rf=afrf; ri=86400"

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