Dextra Rechtsschutz
dextra.ch
86/100Grade A
Protection against forged senders: largely protected
Points per criterion
- MX 10 / 10
- SPF 15 / 15
- DKIM 20 / 20
- DMARC 19 / 25
- DNSSEC 10 / 10
- Transport (MTA-STS/DANE) 12 / 15
- TLS-RPT 0 / 5
- Industry avg.: 58.6 ▲ 27.4
- Canton avg.: 53 ▲ 33
- Overall avg.: 53.5 ▲ 32.5
- Rank 3 of 35 in the industry
Findings
-
!SPF close to the 10-lookup limit (8)
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.
-
!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.
-
iDANE active (TLSA with DNSSEC)
All MX hosts publish TLSA records secured by DNSSEC.
Who runs the mail?
- Mailbox provider
- Microsoft 365
- Upstream gateway
- SEPPmail
- Provider jurisdiction
- USA · MX: CH
- Detection confidence
- 100 / 100
- Microsoft tenant
- Managed · Dextra Rechtsschutz AG
- Tenant region
- EU
Signals (6)
| SPF | Microsoft 365 | include:spf.protection.outlook.com |
|---|---|---|
| DKIM | Microsoft 365 | selector1 → selector1-dextra-ch._domainkey.hugonussdextra.onmicrosoft.com |
| Autodiscover | Microsoft 365 | autodiscover.outlook.com |
| Domain verification | Microsoft 365 | MS=ms91333446 |
| Domain verification | Google Workspace | google-site-verification=vJlQaJcCUH8F3sD |
| Entra ID | Microsoft 365 | Entra-ID-Tenant (Managed) |
MX servers
| Pref | Host | IP | Network | Country | TLSA |
|---|---|---|---|---|---|
| 10 | dextra-ch.gate.seppmail.cloud | 86.119.35.35 | AS559 Switch - SWITCH | CH | ✓ DNSSEC |
217.20.196.81 | AS24951 EVERYWARE-NET - EveryWare AG | CH |
SPF
v=spf1 a:post.sumcumo.net ip4:213.128.151.62 ip4:217.71.90.109 a:mail-out.dextra.ch a:www.dextra.ch include:spf.abacuscity.ch include:_spf.psm.knowbe4.com include:spf.protection.outlook.com include:_spf.ch.seppmail.cloud include:spf.iway.ch -all - all
-all- DNS lookups
- 8 / 10
- Includes
spf.abacuscity.ch_spf.psm.knowbe4.comspf.protection.outlook.com_spf.ch.seppmail.cloudspf.iway.ch- Detected sending services
- Microsoft 365, SEPPmail
- IPv4
- 2 addresses authorised directly
DMARC
v=DMARC1; p=quarantine; rua=mailto:dmarc-reports@dextra.ch; ruf=mailto:dmarc-reports@dextra.ch; fo=1; sp=reject; adkim=r; aspf=r- Policy
- p=quarantine
- Subdomains (sp)
- reject
- Share (pct)
- 100 %
- Alignment DKIM/SPF
- relaxed / relaxed
- Aggregate reports (rua)
dmarc-reports@dextra.ch- Forensic reports (ruf)
dmarc-reports@dextra.ch
DKIM
| Selector | Key | delegated to |
|---|---|---|
default | RSA 2048 | – |
k2 | RSA 2048 | dkim2.mcsv.net |
k3 | RSA 2048 | dkim3.mcsv.net |
s1 | RSA 2048 | s1.domainkey.u10063490.wl241.sendgrid.net |
s2 | RSA 2048 | s2.domainkey.u10063490.wl241.sendgrid.net |
selector1 | RSA 1024 | selector1-dextra-ch._domainkey.hugonussdextra.onmicrosoft.com |
selector2 | RSA 1024 | selector2-dextra-ch._domainkey.hugonussdextra.onmicrosoft.com |
Checked: 100 common selectors. Keys under custom selectors remain invisible.
Transport encryption
- MTA-STS
- missing
- DANE
- active
- DNSSEC
- active
- TLS-RPT
- missing
- BIMI
- missing
Verified services
From verification records in the domain TXT: services where the domain is verified.
Microsoft 365GoogleAppleAtlassian
History
- Score 86 · DMARC quarantine
Raw data
dextra.ch. IN MX 10 dextra-ch.gate.seppmail.cloud.
dextra.ch. IN TXT "v=spf1 a:post.sumcumo.net ip4:213.128.151.62 ip4:217.71.90.109 a:mail-out.dextra.ch a:www.dextra.ch include:spf.abacuscity.ch include:_spf.psm.knowbe4.com include:spf.protection.outlook.com include:_spf.ch.seppmail.cloud include:spf.iway.ch -all "
_dmarc.dextra.ch. IN TXT "v=DMARC1; p=quarantine; rua=mailto:dmarc-reports@dextra.ch; ruf=mailto:dmarc-reports@dextra.ch; fo=1; sp=reject; adkim=r; aspf=r"