AEW Energie

aew.ch

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

70/100Grade B

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) 0 / 15
TLS-RPT 0 / 5

Industry avg.: 60.5 ▲ 9.5
Canton avg.: 57.3 ▲ 12.7
Overall avg.: 53.5 ▲ 16.5
Rank 9 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.
!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: Microsoft 365
Provider jurisdiction: USA · MX: US
Detection confidence: 100 / 100
Microsoft tenant: Managed · AEW Energie AG
Tenant region: EU

Signals (8)

MX	Microsoft 365	`aew-ch.mail.protection.outlook.com`
SPF	Microsoft 365	`include:spf.protection.outlook.com`
DKIM	Microsoft 365	`selector1 → selector1-aew-ch._domainkey.aewfly.onmicrosoft.com`
Autodiscover	Microsoft 365	`autodiscover.outlook.com`
Domain verification	Microsoft 365	`MS=ms53935772`
Network	Microsoft 365	`AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation`
SPF	Swisscom	`include:spf.appmail.swisscom.com`
Entra ID	Microsoft 365	`Entra-ID-Tenant (Managed)`

MX servers

Pref	Host	IP	Network	Country	TLSA
0	`aew-ch.mail.protection.outlook.com`	`52.101.185.13`	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 ip4:51.107.2.56 ip4:185.94.144.39 ip4:185.94.144.40 ip4:159.168.152.61 ip4:159.168.152.62 include:spf.protection.outlook.com include:spf.appmail.swisscom.com include:_spf-dc33.sapsf.eu include:spf.protection.cyon.net include:spf.turbo-smtp.com -all

all: -all
DNS lookups: 5 / 10
Includes: spf.protection.outlook.comspf.appmail.swisscom.com_spf-dc33.sapsf.euspf.protection.cyon.netspf.turbo-smtp.com
Detected sending services: Microsoft 365, Swisscom
IPv4: 5 addresses authorised directly

DMARC

v=DMARC1; p=reject; sp=reject; rua=mailto:dmarc_agg@vali.email

Policy: p=reject
Subdomains (sp): 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-aew-ch._domainkey.aewfly.onmicrosoft.com`
`selector2`	RSA 1024	`selector2-aew-ch._domainkey.aewfly.onmicrosoft.com`
`turbo-smtp`	RSA 1024	–

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.

Microsoft 365

History

18 October 2026 Score 70 · DMARC reject

All changes of this organisation in the change log →

Raw data

aew.ch. IN MX 0 aew-ch.mail.protection.outlook.com.
aew.ch. IN TXT "v=spf1 ip4:51.107.2.56 ip4:185.94.144.39 ip4:185.94.144.40 ip4:159.168.152.61 ip4:159.168.152.62 include:spf.protection.outlook.com include:spf.appmail.swisscom.com include:_spf-dc33.sapsf.eu include:spf.protection.cyon.net include:spf.turbo-smtp.com -all"
_dmarc.aew.ch. IN TXT "v=DMARC1; p=reject; sp=reject; rua=mailto:dmarc_agg@vali.email"

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