Results for protonmail.com

Check again 2020-04-10 05:15:04 Etc/UTC

HTTPS by default

protonmail.com uses HTTPS by default.

Chromium reports the following:

State Title Summary Description
Certificate valid and trusted The connection to this site is using a valid, trusted server certificate issued by SwissSign EV Gold CA 2014 - G22.
Connection secure connection settings The connection to this site is encrypted and authenticated using TLS 1.3, X25519, and AES_256_GCM.
Resources all served securely All resources on this page are served securely.

More information about the site's TLS/SSL configuration:

HTTP Strict Transport Security (HSTS)

HSTS policy for https://protonmail.com:
max-age=31536000; includeSubDomains; preload

Pass Test
max-age set to at least 6 months
includeSubDomains — policy also applies to subdomains
preload — requests inclusion in preload lists

Content Security Policy

Content Security Policy (CSP) header not implemented.

The Content Security Policy tests are based on the ones from the Mozilla HTTP Observatory scanner/grader project (Mozilla Public License 2.0) by April King, reimplemented by us for Webbkoll. The explanatory texts are from the Observatory by Mozilla website, CC-BY-SA 3.0. Any mistake or inaccuracy in the results is our fault.

Referrer Policy

Referrer Policy set to strict-origin-when-cross-origin in Referrer-Policy HTTP header.

Subresource Integrity (SRI)

Subresource Integrity (SRI) not implemented, but all resources are loaded from a similar origin.

The Subresource Integrity test is based on the one from the Mozilla HTTP Observatory scanner/grader project (Mozilla Public License 2.0) by April King, reimplemented by us for Webbkoll.

HTTP headers

Pass Header Value Result
X-Content-Type-Options nosniff X-Content-Type-Options header set to "nosniff"
X-Frame-Options deny X-Frame-Options (XFO) header set to SAMEORIGIN or DENY
X-XSS-Protection 1; mode=block; report=https://reports.protonmail.ch/reports/csp X-XSS-Protection header set to "1; mode=block"

The header tests are based on the ones from the Mozilla HTTP Observatory scanner/grader project (Mozilla Public License 2.0) by April King, reimplemented by us for Webbkoll. The explanatory texts are from the Observatory by Mozilla website, CC-BY-SA 3.0.

Cookies

First-party cookies (2)

Domain Name Value Expires on HttpOnly Secure SameSite
.protonmail.com Session-Id XpAAzDiEogDyzkUSycAa... 2020-07-09 05:14:59Z
protonmail.com Version default 2020-07-09 05:14:59Z

HttpOnly means that the cookie can only be read by the server, and not by JavaScript on the client. This can mitigate XSS (cross-site scripting) attacks.

Secure means that the cookie will only be sent over a secure channel (HTTPS). This can mitigate MITM (man-in-the-middle) attacks.

SameSite can be used to instruct the browser to only send the cookie when the request is originating from the same site. This can mitigate CSRF (cross-site request forgery) attacks.

GDPR: Rec. 60, Rec. 61, Rec. 69, Rec. 70, Rec. 75, Rec. 78, Art. 5.1.a, Art. 5.1.c, Art. 5.1.e, Art. 21, Art. 22, Art. 32.

e-PD (2002/58/EC). Rec. 24, 25, Art. 5.2.

e-PD revised (2009/136/EC). Rec. 65, 66.

More information

localStorage

localStorage not used.

Third-party requests

4 requests (4 secure, 0 insecure) to 2 unique hosts.

A third-party request is a request to a domain that's not protonmail.com or one of its subdomains.

Host IP Country Classification URLs
protonmail.ch 185.70.41.32 CH Show (1)
protonmail.recruitee.com 35.186.220.63 US Show (3)

We use Disconnect's open source list of trackers to classify hosts.

GDPR: Rec. 69, Rec. 70, Art. 5.1.b-c, Art. 25.

Server location

The server protonmail.com (185.70.41.35) appears to have been located in Switzerland during our test.

See more information (e.g., provider) about this IP address using KeyCDN's tool.

Raw headers

Header Value
accept-ranges bytes
cache-control max-age=0
content-encoding gzip
content-length 15049
content-type text/html; charset=utf-8
date Fri, 10 Apr 2020 05:14:52 GMT
etag "df8e-5a2c7a9c003b3-gzip"
expect-ct max-age=2592000, enforce, report-uri="https://reports.protonmail.ch/reports/tls"
expires Fri, 10 Apr 2020 05:14:52 GMT
last-modified Wed, 08 Apr 2020 13:41:53 GMT
public-key-pins-report-only pin-sha256="8joiNBdqaYiQpKskgtkJsqRxF7zN0C0aqfi8DacknnI="; pin-sha256="drtmcR2kFkM8qJClsuWgUzxgBkePfRCkRpqUesyDmeE="; report-uri="https://reports.protonmail.ch/reports/tls"
referrer-policy strict-origin-when-cross-origin
set-cookie Session-Id=XpAAzDiEogDyzkUSycAapgAAAHk; Domain=protonmail.com; Path=/; HttpOnly; Secure; Max-Age=7776000 Version=default; Path=/; Secure; Max-Age=7776000 Version=; Domain=protonmail.com; Path=/; Secure; Expires=Thu, 01 Jan 1970 00:00:00 GMT
strict-transport-security max-age=31536000; includeSubDomains; preload
vary Accept-Encoding
x-content-type-options nosniff
x-frame-options deny
x-permitted-cross-domain-policies none
x-xss-protection 1; mode=block; report=https://reports.protonmail.ch/reports/csp

What this tool checks (and doesn't check)

This tool attempts to simulate what happens when a user visits a specified page with a typical browser. The browser has no addons/extensions installed, and Do Not Track (DNT) is not enabled, since this is the default setting in most browsers.

External files such as images, scripts and CSS are loaded, but the tool performs no interactions with the page — no links are clicked, no forms are submitted.

Disclaimer: The results presented here might not be 100% correct. Bugs happen. This tool is meant to be used by site owners as a starting point for improvements, not as a rigorous analysis.

Text about HTTPS partly adapted from the CIO Council's The HTTPS-Only Standard (public domain). MaxMind's GeoLite2 country database (CC-BY-SA 4.0) is used for GeoIP lookups. See here for more information.