CH Media

chmedia.ch

Industry: Telecom, IT & media
Headquarters: Aarau, Aargau
Type: private
Employees (approx.): 3,400
Checked on: 19 October 2026

91/100Grade A

Protection against forged senders: protected, with a gap: pct=50

Points per criterion

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

Industry avg.: 63.6 ▲ 27.4
Canton avg.: 57.3 ▲ 33.7
Overall avg.: 53.5 ▲ 37.5
Rank 2 of 50 in the industry

Findings

!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 applies to part of the mail only (pct<100) (50)

With pct below 100 the policy is applied to only part of the failing mail.
!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.
!MTA-STS in testing mode only

mode: testing reports failures but enforces nothing.

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 · chmedia
Tenant region: EU

Signals (9)

MX	Microsoft 365	`chmedia-ch.mail.protection.outlook.com`
SPF	Microsoft 365	`include:spf.protection.outlook.com`
DKIM	Microsoft 365	`selector1 → selector1-chmedia-ch._domainkey.chmediaag.onmicrosoft.com`
Autodiscover	Microsoft 365	`autodiscover.outlook.com`
Domain verification	Microsoft 365	`MS=ms37485951`
Network	Microsoft 365	`AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation`
Domain verification	Google Workspace	`google-site-verification=0hBhR8dWv8Sm45Z`
SPF	Amazon	`include:amazonses.com`
Entra ID	Microsoft 365	`Entra-ID-Tenant (Managed)`

MX servers

Pref	Host	IP	Network	Country	TLSA
0	`chmedia-ch.mail.protection.outlook.com`	`52.101.187.1`	AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation	US	–
		`52.101.185.12`	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 a mx include:spf.protection.outlook.com include:spf.mandrillapp.com include:spf.emailsignatures365.com include:spf.mailjet.com include:amazonses.com include:spf1.chmedia.ch a:mailgateway.activecloud.ch exists:%{i}._spf.mta.salesforce.com -all

all: -all
DNS lookups: 10 / 10
Includes: spf.protection.outlook.comspf.mandrillapp.comspf.emailsignatures365.comspf.mailjet.comamazonses.comspf1.chmedia.ch
Detected sending services: Microsoft 365, Mailchimp/Mandrill, Mailchimp Transactional, Mailjet, Amazon SES

DMARC

v=DMARC1; p=reject; sp=quarantine; rf=afrf; pct=50; ri=86400; fo=0:1;

Policy: p=reject
Subdomains (sp): quarantine
Share (pct): 50 %
Alignment DKIM/SPF: relaxed / relaxed
Aggregate reports (rua): –

DKIM

Selector	Key	delegated to
`k1`	RSA 1024	`dkim.mcsv.net`
`mail`	RSA 1024	–
`mailjet`	RSA 1024	–
`mandrill`	RSA 1024	–
`s1`	RSA 2048	`s1.domainkey.u42009239.wl240.sendgrid.net`
`s2`	RSA 2048	`s2.domainkey.u42009239.wl240.sendgrid.net`
`selector1`	RSA 2048	`selector1-chmedia-ch._domainkey.chmediaag.onmicrosoft.com`
`selector2`	RSA 2048	`selector2-chmedia-ch._domainkey.chmediaag.onmicrosoft.com`
`turbo-smtp`	RSA 1024	–

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

Transport encryption

MTA-STS: Mode: testing · max_age: 3,600 s · covers all MX: yes
mx: mgtw.chm-mgmt.zonechmedia-ch.mail.protection.outlook.comevents-chmedia-ch.mail.protection.outlook.comfinanzen-chmedia-ch.mail.protection.outlook.comhr-chmedia-ch.mail.protection.outlook.comkunden-chmedia-ch.mail.protection.outlook.comlieferanten-chmedia-ch.mail.protection.outlook.commx.mailomat.cloudmxa.eu.mailgun.org.chmedia.chmxb.eu.mailgun.org.chmedia.chbounce.xcampaign.chbounce.xprofiler.chbounce.xcampaign.ch
DANE: missing
DNSSEC: active
TLS-RPT: mailto:mta-reports@chmedia.ch
BIMI: missing

Verified services

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

Microsoft 365GoogleAtlassianAdobeGlobalSignBrevoTeamViewer

History

18 October 2026 Score 91 · DMARC reject

All changes of this organisation in the change log →

Raw data

chmedia.ch. IN MX 0 chmedia-ch.mail.protection.outlook.com.
chmedia.ch. IN TXT "v=spf1 a mx include:spf.protection.outlook.com include:spf.mandrillapp.com include:spf.emailsignatures365.com include:spf.mailjet.com include:amazonses.com include:spf1.chmedia.ch a:mailgateway.activecloud.ch exists:%{i}._spf.mta.salesforce.com -all"
_dmarc.chmedia.ch. IN TXT "v=DMARC1; p=reject; sp=quarantine; rf=afrf; pct=50; ri=86400; fo=0:1;"
_mta-sts.chmedia.ch. IN TXT "v=STSv1; id=20260407"
_smtp._tls.chmedia.ch. IN TXT "v=TLSRPTv1; rua=mailto:mta-reports@chmedia.ch"

More from this industry

← Back to overview