Rapp

rapp.ch

Industry: Construction & real estate
Headquarters: Basel, Basel-City
Type: private
Employees (approx.): 500
Checked on: 19 October 2026

64/100Grade C

Protection against forged senders: largely protected

Points per criterion

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

Industry avg.: 58.2 ▲ 5.8
Canton avg.: 57.4 ▲ 6.6
Overall avg.: 53.5 ▲ 10.5
Rank 26 of 67 in the industry

Findings

!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: Microsoft 365
Provider jurisdiction: USA · MX: US
Detection confidence: 100 / 100
Microsoft tenant: Managed · Rapp AG
Tenant region: EU

Signals (7)

MX	Microsoft 365	`rapp-ch.mail.protection.outlook.com`
SPF	Microsoft 365	`include:spf.protection.outlook.com`
DKIM	Microsoft 365	`selector1 → selector1-rapp-ch._domainkey.rapp.onmicrosoft.com`
Autodiscover	Microsoft 365	`autodiscover.outlook.com`
Network	Microsoft 365	`AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation`
Domain verification	Google Workspace	`google-site-verification=4bybsw4zyyZimZu`
Entra ID	Microsoft 365	`Entra-ID-Tenant (Managed)`

MX servers

Pref	Host	IP	Network	Country	TLSA
0	`rapp-ch.mail.protection.outlook.com`	`52.101.68.12`	AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation	US	–
		`52.101.68.27`	AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation	US
		`52.101.103.36`	AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation	US

SPF

v=spf1 ip4:85.25.89.5 ip4:195.10.208.0/26 ip4:5.35.234.234 ip4:80.153.197.244 ip6:2a01:488:42:1000:523:eaea:21:9264 ip6:2001:67c:2050:102:465::/80 include:servers.mcsv.net include:spf.protection.outlook.com include:_spf.rexx-suite.com include:spf.abacuscity.ch include:sendgrid.net -all

all: -all
DNS lookups: 6 / 10
Includes: servers.mcsv.netspf.protection.outlook.com_spf.rexx-suite.comspf.abacuscity.chsendgrid.net
Detected sending services: Mailchimp/Mandrill, Microsoft 365, SendGrid
IPv4: 67 addresses authorised directly

DMARC

v=DMARC1; p=quarantine; sp=quarantine; rua=mailto:dmarc@rapp.ch; rf=afrf; pct=100; ri=86400;

Policy: p=quarantine
Subdomains (sp): quarantine
Share (pct): 100 %
Alignment DKIM/SPF: relaxed / relaxed
Aggregate reports (rua): dmarc@rapp.ch

DKIM

Selector	Key	delegated to
`k1`	RSA 1024	`dkim.mcsv.net`
`s1`	RSA 2048	`s1.domainkey.u33587368.wl119.sendgrid.net`
`s2`	RSA 2048	`s2.domainkey.u33587368.wl119.sendgrid.net`
`selector1`	RSA 1024	`selector1-rapp-ch._domainkey.rapp.onmicrosoft.com`

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.

GoogleAppleAtlassianAdobeAutodesk

History

19 October 2026 Score 64 · DMARC quarantine

All changes of this organisation in the change log →

Raw data

rapp.ch. IN MX 0 rapp-ch.mail.protection.outlook.com.
rapp.ch. IN TXT "v=spf1 ip4:85.25.89.5 ip4:195.10.208.0/26 ip4:5.35.234.234 ip4:80.153.197.244 ip6:2a01:488:42:1000:523:eaea:21:9264 ip6:2001:67c:2050:102:465::/80 include:servers.mcsv.net include:spf.protection.outlook.com include:_spf.rexx-suite.com include:spf.abacuscity.ch include:sendgrid.net -all"
_dmarc.rapp.ch. IN TXT "v=DMARC1; p=quarantine; sp=quarantine; rua=mailto:dmarc@rapp.ch; rf=afrf; pct=100; ri=86400;"

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