ewz

ewz.ch

Industry: Energy
Headquarters: Zürich, Zurich
Type: public
Employees (approx.): 1,300
Checked on: 19 October 2026

49/100Grade C

Protection against forged senders: not protected (monitoring only)

Points per criterion

MX 10 / 10
SPF 13 / 15
DKIM 20 / 20
DMARC 6 / 25
DNSSEC 0 / 10
Transport (MTA-STS/DANE) 0 / 15
TLS-RPT 0 / 5

Industry avg.: 60.5 ▼ 11.5
Canton avg.: 53 ▼ 4
Overall avg.: 53.5 ▼ 4.5
Rank 37 of 43 in the industry

Findings

✕DMARC in monitoring mode only (p=none)

p=none provides reports but does not reject a single forgery. The goal is p=reject.
!SPF close to the 10-lookup limit (8)

One more sending service can break the limit. Flattening or subdomains for third parties create headroom.
!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: Self-hosted / other
Provider jurisdiction: Switzerland · MX: CH
Detection confidence: 85 / 100
Microsoft tenant: Managed · Stadt Zürich
Tenant region: EU

Signals (3)

Domain verification	Google Workspace	`google-site-verification=l38pgp9vJ2RsmzG`
SPF	Amazon	`include:amazonses.com`
Entra ID	Microsoft 365	`Entra-ID-Tenant (Managed)`

MX servers

Pref	Host	IP	Network	Country	TLSA
10	`mx3.stadt-zuerich.ch`	`194.56.33.12`	AS201319 STADTZUERICH - STADTZUERICH	CH	–
50	`mx4.stadt-zuerich.ch`	`194.56.33.13`	AS201319 STADTZUERICH - STADTZUERICH	CH	–

SPF

v=spf1 ip4:194.56.33.0/26 include:_spf.ukcod.org.uk include:spf.smtp2go.com ip4:213.52.186.141 ip4:213.52.186.142 ip4:35.214.208.81 ip4:35.214.213.218 ip4:35.214.183.81 ip4:35.214.212.238 include:spf1.ewz.ch ~all

all: ~all
DNS lookups: 8 / 10
Includes: _spf.ukcod.org.ukspf.smtp2go.comspf1.ewz.ch
Detected sending services: SendGrid, Amazon SES
IPv4: 70 addresses authorised directly

DMARC

v=DMARC1; p=none; rua=mailto:pvwzbjgy@ag.eu.dmarcian.com

Policy: p=none
Subdomains (sp): inherits p=none
Share (pct): 100 %
Alignment DKIM/SPF: relaxed / relaxed
Aggregate reports (rua): pvwzbjgy@ag.eu.dmarcian.com
Report services: dmarcian

DKIM

Selector	Key	delegated to
`mail`	RSA 1024	–
`s1`	RSA 2048	`s1.domainkey.u13870808.wl059.sendgrid.net`
`s2`	RSA 2048	`s2.domainkey.u13870808.wl059.sendgrid.net`

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.

GoogleAppleAdobeMiroBrevo

History

18 October 2026 Score 49 · DMARC none

All changes of this organisation in the change log →

Raw data

ewz.ch. IN MX 10 mx3.stadt-zuerich.ch.
ewz.ch. IN MX 50 mx4.stadt-zuerich.ch.
ewz.ch. IN TXT "v=spf1 ip4:194.56.33.0/26 include:_spf.ukcod.org.uk include:spf.smtp2go.com ip4:213.52.186.141 ip4:213.52.186.142 ip4:35.214.208.81 ip4:35.214.213.218 ip4:35.214.183.81 ip4:35.214.212.238 include:spf1.ewz.ch ~all"
_dmarc.ewz.ch. IN TXT "v=DMARC1; p=none; rua=mailto:pvwzbjgy@ag.eu.dmarcian.com"

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