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feat: Don't send unencrypted Auto-Submitted header (#7938)

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Cherry-picked 8c09ca3

Follow-up to https://github.com/chatmail/core/pull/7935
This commit is contained in:
Hocuri
2026-03-06 10:29:17 +01:00
committed by GitHub
parent abb93cd79d
commit 1e20055523
3 changed files with 9 additions and 15 deletions
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12
src/mimefactory.rs
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@@ -1553,13 +1553,10 @@ impl MimeFactory {
| SystemMessage::MultiDeviceSync
| SystemMessage::WebxdcStatusUpdate => {
// This should prevent automatic replies,
// such as non-delivery reports.
// such as non-delivery reports,
// if the message is unencrypted.
//
// See <https://tools.ietf.org/html/rfc3834>
//
// Adding this header without encryption leaks some
// information about the message contents, but it can
// already be easily guessed from message timing and size.
headers.push((
"Auto-Submitted",
mail_builder::headers::raw::Raw::new("auto-generated").into(),
@@ -2190,10 +2187,7 @@ fn group_headers_by_confidentiality(
mail_builder::headers::raw::Raw::new("[...]").into(),
));
}
"auto-submitted"
| "chat-version"
| "autocrypt-setup-message"
| "chat-is-post-message" => {
"chat-version" | "autocrypt-setup-message" | "chat-is-post-message" => {
unprotected_headers.push(header.clone());
}
_ => {