Keystone-SDA

keystone-sda.ch

Industry: Telecom, IT & media
Headquarters: Bern, Bern
Type: private
Employees (approx.): 300
Checked on: 19 October 2026

51/100Grade C

Protection against forged senders: not protected (monitoring only)

Points per criterion

MX 10 / 10
SPF 15 / 15
DKIM 20 / 20
DMARC 6 / 25
DNSSEC 0 / 10
Transport (MTA-STS/DANE) 0 / 15
TLS-RPT 0 / 5

Industry avg.: 63.6 ▼ 12.6
Canton avg.: 53.1 ▼ 2.1
Overall avg.: 53.5 ▼ 2.5
Rank 41 of 50 in the industry

Findings

✕DMARC in monitoring mode only (p=none)

p=none provides reports but does not reject a single forgery. The goal is p=reject.
!SPF close to the 10-lookup limit (10)

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.
!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: Google Workspace
Provider jurisdiction: USA · MX: US
Detection confidence: 96 / 100
Microsoft tenant: Managed · KEYSTONE-SDA-ATS AG
Tenant region: EU

Signals (7)

Domain verification	Microsoft 365	`MS=ms61484856`
MX	Google Workspace	`smtp.google.com`
SPF	Google Workspace	`include:_spf.google.com`
DKIM	Google Workspace	`google`
Domain verification	Google Workspace	`google-site-verification=FmBiDX3DJLS77LM`
Network	Google Workspace	`AS15169 GOOGLE - Google LLC`
Entra ID	Microsoft 365	`Entra-ID-Tenant (Managed)`

MX servers

Pref	Host	IP	Network	Country	TLSA
1	`smtp.google.com`	`142.251.127.27`	AS15169 GOOGLE - Google LLC	US	–
1	`smtp.google.com`	`142.251.127.26`	AS15169 GOOGLE - Google LLC	US	–

SPF

v=spf1 ip4:91.220.99.10/32 ip4:94.231.81.6/32 ip4:194.232.25.0/24 ip4:18.193.236.241 ip4:185.176.239.62 a:mail.ostendis.ch include:crs.apa.at include:mymailwall.com include:aspmx.pardot.com include:im.post.ch include:_spf.sui-inter.net include:_spf.google.com -all

all: -all
DNS lookups: 10 / 10
Includes: crs.apa.atmymailwall.comaspmx.pardot.comim.post.ch_spf.sui-inter.net_spf.google.com
Detected sending services: Google
IPv4: 260 addresses authorised directly

DMARC

v=DMARC1; p=none;

Policy: p=none
Subdomains (sp): inherits p=none
Share (pct): 100 %
Alignment DKIM/SPF: relaxed / relaxed
Aggregate reports (rua): –

DKIM

Selector	Key	delegated to
`google`	RSA 2048	–
`selector1`	RSA 2048	–

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 365GoogleAppleAtlassian

History

18 October 2026 Score 51 · DMARC none

All changes of this organisation in the change log →

Raw data

keystone-sda.ch. IN MX 1 smtp.google.com.
keystone-sda.ch. IN TXT "v=spf1 ip4:91.220.99.10/32 ip4:94.231.81.6/32 ip4:194.232.25.0/24 ip4:18.193.236.241 ip4:185.176.239.62 a:mail.ostendis.ch include:crs.apa.at include:mymailwall.com include:aspmx.pardot.com include:im.post.ch include:_spf.sui-inter.net include:_spf.google.com -all"
_dmarc.keystone-sda.ch. IN TXT "v=DMARC1; p=none;"

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