Holinger

holinger.com

Industry: Construction & real estate
Headquarters: Liestal, Basel-Country
Type: private
Employees (approx.): 450
Checked on: 19 October 2026

49/100Grade C

Protection against forged senders: largely protected

Points per criterion

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

Industry avg.: 58.2 ▼ 9.2
Canton avg.: 56.1 ▼ 7.1
Overall avg.: 53.5 ▼ 4.5
Rank 50 of 67 in the industry

Findings

✕SPF exceeds 10 DNS lookups (14)

More than ten lookups (include, a, mx, ptr, exists, redirect) cause a permerror; many receivers then treat SPF as failed.
!DMARC without reporting (no rua)

Without aggregate reports it stays invisible who sends in the domain's name.
!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 · HOLINGER AG
Tenant region: EU

Signals (7)

MX	Microsoft 365	`holinger-com.mail.protection.outlook.com`
SPF	Microsoft 365	`include:spf.protection.outlook.com`
DKIM	Microsoft 365	`selector1 → selector1-holinger-com._domainkey.holinger.onmicrosoft.com`
Autodiscover	Microsoft 365	`autodiscover.outlook.com`
Domain verification	Microsoft 365	`MS=ms59262434`
Network	Microsoft 365	`AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation`
Entra ID	Microsoft 365	`Entra-ID-Tenant (Managed)`

MX servers

Pref	Host	IP	Network	Country	TLSA
0	`holinger-com.mail.protection.outlook.com`	`52.101.103.162`	AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation	US	–
		`52.101.73.155`	AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation	US
		`52.101.185.21`	AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation	US

SPF

v=spf1 a ip4:194.209.137.132 ip4:194.209.137.134 include:spf.protection.outlook.com include:spf.umantis.com include:email.freshservice.com -all

all: -all
DNS lookups: 14 / 10
Includes: spf.protection.outlook.comspf.umantis.comemail.freshservice.com
Detected sending services: Microsoft 365, SendGrid, Freshworks
IPv4: 2 addresses authorised directly

DMARC

v=DMARC1; p=quarantine; fo=1

Policy: p=quarantine
Subdomains (sp): inherits p=quarantine
Share (pct): 100 %
Alignment DKIM/SPF: relaxed / relaxed
Aggregate reports (rua): –

DKIM

Selector	Key	delegated to
`mail`	RSA 1024	–
`s1`	RSA 2048	`s1.domainkey.u18858631.wl132.sendgrid.net`
`s2`	RSA 1024	`s2.domainkey.u18858631.wl132.sendgrid.net`
`selector1`	RSA 1024	`selector1-holinger-com._domainkey.holinger.onmicrosoft.com`

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 365AppleMiroBrevoAutodesk

History

19 October 2026 Score 49 · DMARC quarantine

All changes of this organisation in the change log →

Raw data

holinger.com. IN MX 0 holinger-com.mail.protection.outlook.com.
holinger.com. IN TXT "v=spf1 a ip4:194.209.137.132 ip4:194.209.137.134 include:spf.protection.outlook.com include:spf.umantis.com include:email.freshservice.com -all"
_dmarc.holinger.com. IN TXT "v=DMARC1; p=quarantine; fo=1"

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