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authorConor Dooley <conor.dooley@microchip.com>2022-12-31 15:23:21 +0000
committerJonathan Corbet <corbet@lwn.net>2023-01-13 09:26:19 -0700
commit1d2ed9234c85ab4c0f4429134592957abf18c5b5 (patch)
tree2d0c89bea469c6b9bf4d5c38230a09b62cb1082d
parent3760fe201c18945c1692d200b94658092a991bac (diff)
Documentation: process: Document suitability of Proton Mail for kernel development
Proton Mail automatically picks up PGP keys for those with kernel.org accounts (and other domains!) which provide WKD for their users & uses them to encrypt emails, including patches. Document the behaviour & Proton Mail's unsuitability for kernel development. Reviewed-by: Konstantin Ryabitsev <konstantin@linuxfoundation.org> Reviewed-by: Mark Brown <broonie@kernel.org> Signed-off-by: Conor Dooley <conor.dooley@microchip.com> Link: https://lore.kernel.org/r/20221231152320.1340874-1-conor@kernel.org Signed-off-by: Jonathan Corbet <corbet@lwn.net>
-rw-r--r--Documentation/process/email-clients.rst20
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diff --git a/Documentation/process/email-clients.rst b/Documentation/process/email-clients.rst
index fc2c46f3f82d..471e1f93fa09 100644
--- a/Documentation/process/email-clients.rst
+++ b/Documentation/process/email-clients.rst
@@ -350,3 +350,23 @@ although tab2space problem can be solved with external editor.
Another problem is that Gmail will base64-encode any message that has a
non-ASCII character. That includes things like European names.
+
+Proton Mail
+***********
+
+Proton Mail has a "feature" where it looks up keys using Web Key Directory
+(WKD) and encrypts mail to any recipients for which it finds a key.
+Kernel.org publishes the WKD for all developers who have kernel.org accounts.
+As a result, emails sent using Proton Mail to kernel.org addresses will be
+encrypted.
+Unfortunately, Proton Mail does not provide a mechanism to disable the
+automatic encryption, viewing it as a privacy feature.
+The automatic encryption feature is also enabled for mail sent via the Proton
+Mail Bridge, so this affects all outgoing messages, including patches sent with
+``git send-email``.
+Encrypted mail adds unnecessary friction, as other developers may not have mail
+clients, or tooling, configured for use with encrypted mail and some mail
+clients may encrypt responses to encrypted mail for all recipients, including
+the mailing lists.
+Unless a way to disable this "feature" is introduced, Proton Mail is unsuited
+to kernel development.