CSS
css.ch
- Industry
- Health insurers
- Headquarters
- Luzern, Lucerne
- Type
- private
- Employees (approx.)
- 2,800
- 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.: 60.5 ▲ 13.5
- Canton avg.: 56.6 ▲ 17.4
- Overall avg.: 53.5 ▲ 20.5
- Rank 3 of 16 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.
-
iBIMI with mark certificate (VMC/CMC)
Logo with a verified mark certificate, shown by Gmail and Apple Mail among others. Requires DMARC enforcement.
Who runs the mail?
- Mailbox provider
- Self-hosted / other
- Provider jurisdiction
- Switzerland · MX: CH
- Detection confidence
- 85 / 100
- Microsoft tenant
- Managed · CSS
- Tenant region
- EU
Signals (4)
| SPF | Microsoft 365 | include:spf.protection.outlook.com |
|---|---|---|
| Domain verification | Google Workspace | google-site-verification=85mmnIcIboSIrVR |
| Network | Swisscom | AS3303 SWISSCOM - Swisscom (Schweiz) AG |
| Entra ID | Microsoft 365 | Entra-ID-Tenant (Managed) |
MX servers
| Pref | Host | IP | Network | Country | TLSA |
|---|---|---|---|---|---|
| 10 | mailer3.css.ch | 194.209.96.16 | AS3303 SWISSCOM - Swisscom (Schweiz) AG | CH | – |
| 10 | mailer1.css.ch | 194.209.96.14 | AS3303 SWISSCOM - Swisscom (Schweiz) AG | CH | – |
| 10 | mailer2.css.ch | 194.209.96.15 | AS3303 SWISSCOM - Swisscom (Schweiz) AG | CH | – |
SPF
v=spf1 ip4:194.209.96.0/24 ip4:193.247.124.0/24 ip4:94.230.211.183 ip4:62.12.142.98 ip4:81.27.116.85 ip4:185.189.239.13 include:spf1.css.ch -all- all
-all- DNS lookups
- 2 / 10
- Includes
spf1.css.ch- Detected sending services
- Microsoft 365
- IPv4
- 516 addresses authorised directly
DMARC
v=DMARC1;p=quarantine;pct=100;rua=mailto:cssversicherung-d@dmarc.report-uri.com;ruf=mailto:forensic.report@css.ch;fo=1- Policy
- p=quarantine
- Subdomains (sp)
- inherits p=quarantine
- Share (pct)
- 100 %
- Alignment DKIM/SPF
- relaxed / relaxed
- Aggregate reports (rua)
cssversicherung-d@dmarc.report-uri.com- Forensic reports (ruf)
forensic.report@css.ch- Report services
- Report URI
DKIM
| Selector | Key | delegated to |
|---|---|---|
key2 | RSA 1024 | – |
mail | RSA 1024 | – |
mailjet | RSA 1024 | – |
mandrill | 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
- VMC/CMC ✓ · Logo
Verified services
From verification records in the domain TXT: services where the domain is verified.
GoogleAtlassianFigma
History
- Score 74 · DMARC quarantine
Raw data
css.ch. IN MX 10 mailer3.css.ch.
css.ch. IN MX 10 mailer1.css.ch.
css.ch. IN MX 10 mailer2.css.ch.
css.ch. IN TXT "v=spf1 ip4:194.209.96.0/24 ip4:193.247.124.0/24 ip4:94.230.211.183 ip4:62.12.142.98 ip4:81.27.116.85 ip4:185.189.239.13 include:spf1.css.ch -all"
_dmarc.css.ch. IN TXT "v=DMARC1;p=quarantine;pct=100;rua=mailto:cssversicherung-d@dmarc.report-uri.com;ruf=mailto:forensic.report@css.ch;fo=1"
default._bimi.css.ch. IN TXT "v=BIMI1; l=https://vmc.digicert.com/feeb9263-d30e-43af-af7a-1f41af40aff5.svg; a=…"