Feller

feller.ch

Industry: Machinery & electrical
Headquarters: Horgen, Zurich
Type: private
Employees (approx.): 500
Checked on: 19 October 2026

72/100Grade B

Protection against forged senders: largely protected

Points per criterion

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

Industry avg.: 62.2 ▲ 9.8
Canton avg.: 53 ▲ 19
Overall avg.: 53.5 ▲ 18.5
Rank 17 of 112 in the industry

Findings

!DKIM key below 2048 bits

RSA-1024 is considered too weak (RFC 8301, M3AAWG). Rotate to 2048-bit keys.
!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: Mimecast
Provider jurisdiction: USA · MX: DE
Detection confidence: 42 / 100
Microsoft tenant: Managed · Schneider Electric
Tenant region: EU

Signals (3)

Autodiscover	Microsoft 365	`autodiscover.outlook.com`
Domain verification	Microsoft 365	`MS=ms71314518`
Entra ID	Microsoft 365	`Entra-ID-Tenant (Managed)`

MX servers

Pref	Host	IP	Network	Country	TLSA
10	`de-smtp-inbound-2.mimecast.com`	`194.104.108.22`	AS39588 MIMECAST-DE - Mimecast Services Limited	DE	–
10	`de-smtp-inbound-2.mimecast.com`	`194.104.110.22`	AS39588 MIMECAST-DE - Mimecast Services Limited	DE	–
10	`de-smtp-inbound-1.mimecast.com`	`194.104.108.22`	AS39588 MIMECAST-DE - Mimecast Services Limited	DE	–
10	`de-smtp-inbound-1.mimecast.com`	`194.104.110.22`	AS39588 MIMECAST-DE - Mimecast Services Limited	DE	–

SPF

v=spf1 include:inx.ch include:%{i}._ip.%{h}._ehlo.%{d}._spf.vali.email ~all

all: ~all
DNS lookups: 4 / 10
Includes: inx.ch

DMARC

v=DMARC1; p=quarantine; rua=mailto:dmarc_agg@vali.email

Policy: p=quarantine
Subdomains (sp): inherits p=quarantine
Share (pct): 100 %
Alignment DKIM/SPF: relaxed / relaxed
Aggregate reports (rua): dmarc_agg@vali.email

DKIM

Selector	Key	delegated to
`k1`	RSA 1024	`dkim.mcsv.net`
`k2`	RSA 2048	`dkim2.mcsv.net`
`k3`	RSA 2048	`dkim3.mcsv.net`
`mandrill`	RSA 1024	–
`smtpapi`	RSA 1024	–

Checked: 100 common selectors. Keys under custom selectors remain invisible.

Transport encryption

MTA-STS: missing
DANE: missing
DNSSEC: active
TLS-RPT: missing
BIMI: missing

Verified services

From verification records in the domain TXT: services where the domain is verified.

Microsoft 365DocuSignAdobeKnowBe4TeamViewer

History

19 October 2026 Score 72 · DMARC quarantine

All changes of this organisation in the change log →

Raw data

feller.ch. IN MX 10 de-smtp-inbound-2.mimecast.com.
feller.ch. IN MX 10 de-smtp-inbound-1.mimecast.com.
feller.ch. IN TXT "v=spf1 include:inx.ch include:%{i}._ip.%{h}._ehlo.%{d}._spf.vali.email ~all"
_dmarc.feller.ch. IN TXT "v=DMARC1; p=quarantine; rua=mailto:dmarc_agg@vali.email"

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