St.Galler Stadtwerke

sgsw.ch

Industry: Energy
Headquarters: St. Gallen, St. Gallen
Type: public
Employees (approx.): 400
Checked on: 19 October 2026

88/100Grade A

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) 15 / 15
TLS-RPT 5 / 5

Industry avg.: 60.5 ▲ 27.5
Canton avg.: 52.3 ▲ 35.7
Overall avg.: 53.5 ▲ 34.5
Rank 1 of 43 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.
iDANE active (TLSA with DNSSEC)

All MX hosts publish TLSA records secured by DNSSEC.

Check live in the Mail DNS Check →

Who runs the mail?

Mailbox provider: Microsoft 365
Upstream gateway: SEPPmail
Provider jurisdiction: USA · MX: CH
Detection confidence: 92 / 100
Microsoft tenant: Managed · Stadtverwaltung St.Gallen
Tenant region: EU

Signals (5)

SPF	Microsoft 365	`include:spf.protection.outlook.com`
Autodiscover	Microsoft 365	`autodiscover.outlook.com`
Domain verification	Microsoft 365	`MS=ms66620834`
SPF	Swiss hoster	`include:spf.mail.hostpoint.ch`
Entra ID	Microsoft 365	`Entra-ID-Tenant (Managed)`

MX servers

Pref	Host	IP	Network	Country	TLSA
0	`sgsw-ch.gate.seppmail.cloud`	`86.119.35.35`	AS559 Switch - SWITCH	CH	✓ DNSSEC
0	`sgsw-ch.gate.seppmail.cloud`	`217.20.196.81`	AS24951 EVERYWARE-NET - EveryWare AG	CH	✓ DNSSEC

SPF

v=spf1 include:spf.mail.hostpoint.ch include:spf.mailjet.com include:spf.protection.outlook.com include:_spf.ch.seppmail.cloud ~all

all: ~all
DNS lookups: 4 / 10
Includes: spf.mail.hostpoint.chspf.mailjet.comspf.protection.outlook.com_spf.ch.seppmail.cloud
Detected sending services: Hostpoint, Mailjet, Microsoft 365, SEPPmail

DMARC

v=DMARC1; p=reject; rua=mailto:b332ab15@in.mailhardener.com; ruf=mailto:b332ab15@in.mailhardener.com

Policy: p=reject
Subdomains (sp): inherits p=reject
Share (pct): 100 %
Alignment DKIM/SPF: relaxed / relaxed
Aggregate reports (rua): b332ab15@in.mailhardener.com
Forensic reports (ruf): b332ab15@in.mailhardener.com
Report services: Mailhardener

DKIM

Selector	Key	delegated to
`default`	RSA 2048	–
`mailjet`	RSA 1024	–
`s1`	RSA 1024	–

Checked: 100 common selectors. Keys under custom selectors remain invisible.

Transport encryption

MTA-STS: Mode: enforce · max_age: 1,209,600 s · covers all MX: yes
mx: sgsw-ch.gate.seppmail.cloud
DANE: active
DNSSEC: missing
TLS-RPT: mailto:b332ab15@in.mailhardener.com
BIMI: missing

Verified services

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

Microsoft 365ZoomMiro

History

19 October 2026 Score 88 · DMARC reject

All changes of this organisation in the change log →

Raw data

sgsw.ch. IN MX 0 sgsw-ch.gate.seppmail.cloud.
sgsw.ch. IN TXT "v=spf1 include:spf.mail.hostpoint.ch include:spf.mailjet.com include:spf.protection.outlook.com include:_spf.ch.seppmail.cloud ~all"
_dmarc.sgsw.ch. IN TXT "v=DMARC1; p=reject; rua=mailto:b332ab15@in.mailhardener.com; ruf=mailto:b332ab15@in.mailhardener.com"
_mta-sts.sgsw.ch. IN TXT "v=STSv1; id=20190601000000Z"
_smtp._tls.sgsw.ch. IN TXT "v=TLSRPTv1; rua=mailto:b332ab15@in.mailhardener.com"

More from this industry

← Back to overview