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Add option to convert CRLF to LF line endings for sendmail (#18075)

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It appears that several versions of sendmail require that the mail is sent to them with
LF line endings instead of CRLF endings - which of course they will then convert back
to CRLF line endings to comply with the SMTP standard.

This PR adds another setting SENDMAIL_CONVERT_CRLF which will pass the message writer
through a filter. This will filter out and convert CRLFs to LFs before writing them
out to sendmail.

Fix #18024

Signed-off-by: Andrew Thornton <art27@cantab.net>
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zeripath 2022-01-06 00:43:45 +00:00 • committed by GitHub
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docs/content/doc/advanced/config-cheat-sheet.en-us.md
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@ -667,6 +667,7 @@ Define allowed algorithms and their minimum key length (use -1 to disable a type
command or full path).
- `SENDMAIL_ARGS`: **_empty_**: Specify any extra sendmail arguments.
- `SENDMAIL_TIMEOUT`: **5m**: default timeout for sending email through sendmail
- `SENDMAIL_CONVERT_CRLF`: **true**: Most versions of sendmail prefer LF line endings rather than CRLF line endings. Set this to false if your version of sendmail requires CRLF line endings.
- `SEND_BUFFER_LEN`: **100**: Buffer length of mailing queue. **DEPRECATED** use `LENGTH` in `[queue.mailer]`
## Cache (`cache`)