Ergon Informatik

ergon.ch

Industry: Telecom, IT & media
Headquarters: Zürich, Zurich
Type: private
Employees (approx.): 400
Checked on: 19 October 2026

87/100Grade A

Protection against forged senders: protected

Points per criterion

MX 10 / 10
SPF 15 / 15
DKIM 20 / 20
DMARC 25 / 25
DNSSEC 0 / 10
Transport (MTA-STS/DANE) 12 / 15
TLS-RPT 5 / 5

Industry avg.: 63.6 ▲ 23.4
Canton avg.: 53 ▲ 34
Overall avg.: 53.5 ▲ 33.5
Rank 4 of 50 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.

Check live in the Mail DNS Check →

Who runs the mail?

Mailbox provider: Microsoft 365
Provider jurisdiction: USA · MX: US
Detection confidence: 100 / 100
Microsoft tenant: Managed · Ergon Informatik AG
Tenant region: EU

Signals (8)

MX	Microsoft 365	`ergon-ch.mail.protection.outlook.com`
SPF	Microsoft 365	`include:spf.protection.outlook.com`
DKIM	Microsoft 365	`selector1 → selector1-ergon-ch._domainkey.ergoninformatik.onmicrosoft.com`
Autodiscover	Microsoft 365	`autodiscover.outlook.com`
Domain verification	Microsoft 365	`MS=ms42521061`
Network	Microsoft 365	`AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation`
Domain verification	Google Workspace	`google-site-verification=HyJ5iKKTPI-Y_Go`
Entra ID	Microsoft 365	`Entra-ID-Tenant (Managed)`

MX servers

Pref	Host	IP	Network	Country	TLSA
0	`ergon-ch.mail.protection.outlook.com`	`52.101.185.12`	AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation	US	–
		`52.101.185.14`	AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation	US
		`52.101.187.1`	AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation	US

SPF

v=spf1 ip4:87.239.214.0/24 ip4:87.239.215.0/24 ip4:5.148.183.120 include:spf.protection.outlook.com include:spf.crsend.com include:spfhard.crsend.com mx -all

all: -all
DNS lookups: 4 / 10
Includes: spf.protection.outlook.comspf.crsend.comspfhard.crsend.com
Detected sending services: Microsoft 365
IPv4: 513 addresses authorised directly

DMARC

v=DMARC1; p=reject; 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
`selector1`	RSA 1024	`selector1-ergon-ch._domainkey.ergoninformatik.onmicrosoft.com`
`selector2`	RSA 2048	`selector2-ergon-ch._domainkey.ergoninformatik.onmicrosoft.com`

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

Transport encryption

MTA-STS: Mode: enforce · max_age: 604,800 s · covers all MX: yes
mx: *.mail.protection.outlook.com
DANE: missing
DNSSEC: missing
TLS-RPT: mailto:sysadm-infra@ergon.ch
BIMI: missing

Verified services

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

Microsoft 365GoogleAtlassianZoomCisco WebexHave I Been PwnedMiro

History

18 October 2026 Score 87 · DMARC reject

All changes of this organisation in the change log →

Raw data

ergon.ch. IN MX 0 ergon-ch.mail.protection.outlook.com.
ergon.ch. IN TXT "v=spf1 ip4:87.239.214.0/24 ip4:87.239.215.0/24 ip4:5.148.183.120 include:spf.protection.outlook.com include:spf.crsend.com include:spfhard.crsend.com mx -all"
_dmarc.ergon.ch. IN TXT "v=DMARC1; p=reject; rua=mailto:dmarc_agg@vali.email"
_mta-sts.ergon.ch. IN TXT "v=STSv1; id=2026070201"
_smtp._tls.ergon.ch. IN TXT "v=TLSRPTv1; rua=mailto:sysadm-infra@ergon.ch"

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