ABZ Allgemeine Baugenossenschaft Zürich

abz.ch

Industry: Construction & real estate
Headquarters: Zürich, Zurich
Type: cooperative
Employees (approx.): 130
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.: 58.2 ▲ 11.8
Canton avg.: 53 ▲ 17
Overall avg.: 53.5 ▲ 16.5
Rank 12 of 67 in the industry

Findings

!SPF close to the 10-lookup limit (9)

One more sending service can break the limit. Flattening or subdomains for third parties create headroom.
!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 · ABZ
Tenant region: EU

Signals (8)

MX	Microsoft 365	`abz-ch.mail.protection.outlook.com`
SPF	Microsoft 365	`include:spf.protection.outlook.com`
DKIM	Microsoft 365	`selector1 → selector1-abz-ch._domainkey.abznet.onmicrosoft.com`
Autodiscover	Microsoft 365	`autodiscover.outlook.com`
Domain verification	Microsoft 365	`MS=ms73529793`
Network	Microsoft 365	`AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation`
Domain verification	Google Workspace	`google-site-verification=p4xDhy-kL8xlWBq`
Entra ID	Microsoft 365	`Entra-ID-Tenant (Managed)`

MX servers

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

SPF

v=spf1 include:spf.protection.outlook.com ip4:185.157.0.67 ip4:185.157.0.66 a:mail.ostendis.ch ip4:80.74.149.100 ip4:80.74.149.208 include:servers.mcsv.net include:mailgun.org include:spf.mailxpert.ch -all

all: -all
DNS lookups: 9 / 10
Includes: spf.protection.outlook.comservers.mcsv.netmailgun.orgspf.mailxpert.ch
Detected sending services: Microsoft 365, Mailchimp/Mandrill, Mailgun, Mailxpert
IPv4: 4 addresses authorised directly

DMARC

v=DMARC1; p=reject; pct=100

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

DKIM

Selector	Key	delegated to
`k1`	RSA 1024	`dkim.mcsv.net`
`selector1`	RSA 1024	`selector1-abz-ch._domainkey.abznet.onmicrosoft.com`
`selector2`	RSA 2048	`selector2-abz-ch._domainkey.abznet.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 365GoogleApple

History

19 October 2026 Score 70 · DMARC reject

All changes of this organisation in the change log →

Raw data

abz.ch. IN MX 0 abz-ch.mail.protection.outlook.com.
abz.ch. IN TXT "v=spf1 include:spf.protection.outlook.com ip4:185.157.0.67 ip4:185.157.0.66 a:mail.ostendis.ch ip4:80.74.149.100 ip4:80.74.149.208 include:servers.mcsv.net include:mailgun.org include:spf.mailxpert.ch -all"
_dmarc.abz.ch. IN TXT "v=DMARC1; p=reject; pct=100"

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