ESB Energie Service Biel

esb.ch

Industry: Energy
Headquarters: Biel, Bern
Type: public
Employees (approx.): 250
Checked on: 19 October 2026

64/100Grade C

Protection against forged senders: largely protected

Points per criterion

MX 10 / 10
SPF 15 / 15
DKIM 20 / 20
DMARC 19 / 25
DNSSEC 0 / 10
Transport (MTA-STS/DANE) 0 / 15
TLS-RPT 0 / 5

Industry avg.: 60.5 ▲ 3.5
Canton avg.: 53.1 ▲ 10.9
Overall avg.: 53.5 ▲ 10.5
Rank 17 of 43 in the industry

Findings

!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
Upstream gateway: Barracuda
Provider jurisdiction: USA · MX: US
Detection confidence: 92 / 100
Microsoft tenant: Managed · Energie Service Biel-Bienne
Tenant region: EU

Signals (6)

SPF	Microsoft 365	`include:spf.protection.outlook.com`
Autodiscover	Microsoft 365	`autodiscover.outlook.com`
Domain verification	Microsoft 365	`MS=ms24468134`
Domain verification	Google Workspace	`google-site-verification=wyv3rPFNFQ-8n5y`
Network	Amazon	`AS16509 AMAZON-02 - Amazon.com, Inc.`
Entra ID	Microsoft 365	`Entra-ID-Tenant (Managed)`

MX servers

Pref	Host	IP	Network	Country	TLSA
10	`d323269.a.ess.de.barracudanetworks.com`	`18.185.115.251`	AS16509 AMAZON-02 - Amazon.com, Inc.	US	–
		`18.185.115.250`	AS16509 AMAZON-02 - Amazon.com, Inc.	US
		`18.185.115.252`	AS16509 AMAZON-02 - Amazon.com, Inc.	US
20	`d323269.b.ess.de.barracudanetworks.com`	`18.185.115.252`	AS16509 AMAZON-02 - Amazon.com, Inc.	US	–
		`18.185.115.250`	AS16509 AMAZON-02 - Amazon.com, Inc.	US
		`18.185.115.251`	AS16509 AMAZON-02 - Amazon.com, Inc.	US

SPF

v=spf1 ip4:212.243.37.128/27 ip4:178.209.55.179 include:spf.protection.outlook.com include:spf.ess.de.barracudanetworks.com include:spf.abacuscity.ch include:spf.send.arcmedia.ch -all

all: -all
DNS lookups: 4 / 10
Includes: spf.protection.outlook.comspf.ess.de.barracudanetworks.comspf.abacuscity.chspf.send.arcmedia.ch
Detected sending services: Microsoft 365
IPv4: 33 addresses authorised directly

DMARC

v=DMARC1;p=quarantine;sp=quarantine;pct=100;rua=mailto:rua+esb.ch@dmarc.barracudanetworks.com;ruf=mailto:ruf+esb.ch@dmarc.barracudanetworks.com;aspf=r;adkim=r;fo=1

Policy: p=quarantine
Subdomains (sp): quarantine
Share (pct): 100 %
Alignment DKIM/SPF: relaxed / relaxed
Aggregate reports (rua): rua+esb.ch@dmarc.barracudanetworks.com
Forensic reports (ruf): ruf+esb.ch@dmarc.barracudanetworks.com
Report services: Barracuda

DKIM

Selector	Key	delegated to
`s1`	RSA 2048	`s1.domainkey.u29851423.wl174.sendgrid.net`
`s2`	RSA 2048	`s2.domainkey.u29851423.wl174.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.

Microsoft 365GoogleAppleAtlassianBrevo

History

18 October 2026 Score 64 · DMARC quarantine

All changes of this organisation in the change log →

Raw data

esb.ch. IN MX 10 d323269.a.ess.de.barracudanetworks.com.
esb.ch. IN MX 20 d323269.b.ess.de.barracudanetworks.com.
esb.ch. IN TXT "v=spf1 ip4:212.243.37.128/27 ip4:178.209.55.179 include:spf.protection.outlook.com include:spf.ess.de.barracudanetworks.com include:spf.abacuscity.ch include:spf.send.arcmedia.ch -all"
_dmarc.esb.ch. IN TXT "v=DMARC1;p=quarantine;sp=quarantine;pct=100;rua=mailto:rua+esb.ch@dmarc.barracudanetworks.com;ruf=mailto:ruf+esb.ch@dmarc.barracudanetworks.com;aspf=r;adkim=r;fo=1"

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