T-Systems Schweiz

t-systems.com

Industry: Telecom, IT & media
Headquarters: Zollikofen, Bern
Type: listed
Checked on: 19 October 2026

62/100Grade C

Protection against forged senders: largely protected

Points per criterion

MX 10 / 10
SPF 13 / 15
DKIM 20 / 20
DMARC 19 / 25
DNSSEC 0 / 10
Transport (MTA-STS/DANE) 0 / 15
TLS-RPT 0 / 5

Industry avg.: 63.6 ▼ 1.6
Canton avg.: 53.1 ▲ 8.9
Overall avg.: 53.5 ▲ 8.5
Rank 33 of 50 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.
!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: Self-hosted / other
Provider jurisdiction: USA · MX: US
Detection confidence: 85 / 100
Microsoft tenant: Federated · Deutsche Telekom AG
Tenant region: EU
Federated via: fed.telekom.de

Signals (8)

SPF	Microsoft 365	`include:spf.protection.outlook.com`
Domain verification	Microsoft 365	`MS=ms45872334`
SPF	Google Workspace	`include:_spf.google.com`
Domain verification	Google Workspace	`google-site-verification=pUK0Nl3BZbzFAFa`
SPF	Amazon	`include:amazonses.com`
Domain verification	Amazon	`amazonses:WT0UTxpzNWvD5h9koLnRkGthAhkppJ`
Network	Amazon	`AS16509 AMAZON-02 - Amazon.com, Inc.`
Entra ID	Microsoft 365	`Entra-ID-Tenant (Federated)`

MX servers

Pref	Host	IP	Network	Country	TLSA
100	`mailin.ng.telekom.net`	`3.126.204.238`	AS16509 AMAZON-02 - Amazon.com, Inc.	US	–
100	`mailin.ng.telekom.net`	`3.71.246.67`	AS16509 AMAZON-02 - Amazon.com, Inc.	US	–

SPF

v=spf1 ip4:193.192.231.129 ip4:193.192.231.130 ip4:205.201.128.0 ip4:198.2.128.0/18 ip4:148.105.8.0/21 include:_spfa.telekom.com include:_spf.t-systems.at ~all

all: ~all
DNS lookups: 9 / 10
Includes: _spfa.telekom.com_spf.t-systems.at
Detected sending services: Microsoft 365, Google, Amazon SES, Salesforce
IPv4: 18,435 addresses authorised directly

DMARC

v=DMARC1;p=quarantine;rua=mailto:dmarc@t-systems.com;ruf=mailto:dmarc@t-systems.com;

Policy: p=quarantine
Subdomains (sp): inherits p=quarantine
Share (pct): 100 %
Alignment DKIM/SPF: relaxed / relaxed
Aggregate reports (rua): dmarc@t-systems.com
Forensic reports (ruf): dmarc@t-systems.com

DKIM

Selector	Key	delegated to
`hs1`	RSA 2048	`t--systems-com.hs01a.dkim.hubspotemail.net`
`hs2`	RSA 2048	`t--systems-com.hs01b.dkim.hubspotemail.net`
`k1`	RSA 1024	`dkim.mcsv.net`
`mail`	RSA 2048	–
`smtpapi`	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 365GoogleAtlassianDocuSignAdobeZoomCisco WebexAmazon SESMiroFigma

History

19 October 2026 Score 62 · DMARC quarantine

All changes of this organisation in the change log →

Raw data

t-systems.com. IN MX 100 mailin.ng.telekom.net.
t-systems.com. IN TXT "v=spf1 ip4:193.192.231.129 ip4:193.192.231.130 ip4:205.201.128.0 ip4:198.2.128.0/18 ip4:148.105.8.0/21 include:_spfa.telekom.com include:_spf.t-systems.at ~all"
_dmarc.t-systems.com. IN TXT "v=DMARC1;p=quarantine;rua=mailto:dmarc@t-systems.com;ruf=mailto:dmarc@t-systems.com;"

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