From: Conor Dooley <conor.dooley@xxxxxxxxxxxxx> 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. Signed-off-by: Conor Dooley <conor.dooley@xxxxxxxxxxxxx> --- Documentation/process/email-clients.rst | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/Documentation/process/email-clients.rst b/Documentation/process/email-clients.rst index fc2c46f3f82d..c448f2814b84 100644 --- a/Documentation/process/email-clients.rst +++ b/Documentation/process/email-clients.rst @@ -350,3 +350,18 @@ 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 email 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. +This affects mail sent from their web GUI, from other mail clients using their +mail "bridge", as well as patches sent using ``git send-email``. +Unless a way to disable this "feature" is introduced, Proton Mail is unsuited +to kernel development. -- 2.38.1
