applied: [PATCH proxmox v3] fix #7814: send-mail: normalize LF line endings to CRLF endings

[Thomas Lamprecht <t.lamprecht@proxmox.com>]

On Tue, 20 Oct 2026 16:34:35 +0200, Shannon Sterz wrote:
> RFC5321 Section 2.3.8 requires that mails do not contain bare CR or LF
> bytes. this patch normalizes unix style LF line endings to CRLF line
> endings. it also removes bare CR bytes.
> 
> when text would be base64 encoded, CR bytes will be dropped, to keep
> the behavior for encoded and non-encoded text aligned. to comply with
> rfc 2045 section 6.8 and rfc 2047 section 4.1 line endings are also
> normalized before encoding them in headers and body text [1,2].
> 
> [...]

Applied, thanks!

[1/1] fix #7814: send-mail: normalize LF line endings to CRLF endings
      commit: 21bb4956bdbc6ebd4d2bd0ec020f4ff5835d28fc

FYI, I folded in a few changes and reworded the commit message:

- Moved both line ending loops to a shared helper normalize_line_endings().
- Filenames use char::is_control() to strip C1 control chars too.
- Custom headers get CR stripped together with LF again, so the injection
  guard does not rely on later normalization.
- I dropped the RFC 2047 reference, as that section does not require
  normalized line endings.

Note that #7814 itself is acutally about SMTP targets, which do not use
sendmail. There, lettre sends the forwarded message as is and dot-stuffs
only lines that follow a CRLF. So bare LFs reached the relay, and a line
with just a dot was not escaped. I added a follow-up that normalizes the
message with the new helper, which keeps its MIME encodings intact. See
7668648f ("fix #7814: notify: smtp: normalize forwarded mail line endings")