Proton

proton.me

Industry: Telecom, IT & media
Headquarters: Plan-les-Ouates, Geneva
Type: private
Employees (approx.): 500
Checked on: 19 October 2026

92/100Grade A

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) 15 / 15
TLS-RPT 5 / 5

Industry avg.: 63.6 ▲ 28.4
Canton avg.: 51.9 ▲ 40.1
Overall avg.: 53.5 ▲ 38.5
Rank 1 of 50 in the industry

Findings

!DMARC without reporting (no rua)

Without aggregate reports it stays invisible who sends in the domain's name.
iStrict DMARC alignment

adkim=s or aspf=s requires exact domain matches. Secure, but demanding when sending from subdomains.
iDANE active (TLSA with DNSSEC)

All MX hosts publish TLSA records secured by DNSSEC.
iBIMI logo published

A brand logo for mail clients is published (without a certificate large providers do not show it).

Check live in the Mail DNS Check →

Who runs the mail?

Mailbox provider: Schweizer Hoster
Provider jurisdiction: Switzerland · MX: CH
Detection confidence: 92 / 100
Microsoft tenant: Managed · proton.me
Tenant region: SA

Signals (5)

Domain verification	Google Workspace	`google-site-verification=2FGIDo-Gf-lWE6t`
MX	Swiss hoster	`mail.protonmail.ch`
SPF	Swiss hoster	`include:_spf.protonmail.ch`
Domain verification	Swiss hoster	`protonmail-verification=5262a92f988e64f1`
Entra ID	Microsoft 365	`Entra-ID-Tenant (Managed)`

MX servers

Pref	Host	IP	Network	Country	TLSA
10	`mail.protonmail.ch`	`176.119.200.128`	AS62371 PROTON - Proton AG	CH	✓ DNSSEC
		`185.205.70.128`	AS62371 PROTON - Proton AG	CH
		`185.70.42.128`	AS62371 PROTON - Proton AG	CH
20	`mailsec.protonmail.ch`	`176.119.200.129`	AS62371 PROTON - Proton AG	CH	✓ DNSSEC
		`185.70.42.129`	AS62371 PROTON - Proton AG	CH
		`185.205.70.129`	AS62371 PROTON - Proton AG	CH

SPF

v=spf1 include:_spf.protonmail.ch ~all

all: ~all
DNS lookups: 2 / 10
Includes: _spf.protonmail.ch

DMARC

v=DMARC1; p=quarantine; fo=1; aspf=s; adkim=s;

Policy: p=quarantine
Subdomains (sp): inherits p=quarantine
Share (pct): 100 %
Alignment DKIM/SPF: strict / strict
Aggregate reports (rua): –

DKIM

Selector	Key	delegated to
`protonmail`	RSA 2048	`protonmail.domainkey.drfeyjwh4gwlal4e2rhajsytrp6auv2nhenecpzigu7muak6lw6ya.domains.proton.ch`
`protonmail2`	RSA 2048	`protonmail2.domainkey.drfeyjwh4gwlal4e2rhajsytrp6auv2nhenecpzigu7muak6lw6ya.domains.proton.ch`

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

Transport encryption

MTA-STS: Mode: enforce · max_age: 604,800 s · covers all MX: yes
mx: mail.protonmail.chmailsec.protonmail.ch
DANE: active
DNSSEC: active
TLS-RPT: https://reports.proton.me/reports/smtptls
BIMI: without certificate

Verified services

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

GoogleYandexLinkedIn

History

19 October 2026 Score 92 · DMARC quarantine

All changes of this organisation in the change log →

Raw data

proton.me. IN MX 10 mail.protonmail.ch.
proton.me. IN MX 20 mailsec.protonmail.ch.
proton.me. IN TXT "v=spf1 include:_spf.protonmail.ch ~all"
_dmarc.proton.me. IN TXT "v=DMARC1; p=quarantine; fo=1; aspf=s; adkim=s;"
_mta-sts.proton.me. IN TXT "v=STSv1; id=190906205100Z"
_smtp._tls.proton.me. IN TXT "v=TLSRPTv1; rua=https://reports.proton.me/reports/smtptls"
default._bimi.proton.me. IN TXT "v=BIMI1; l="

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