Backslashes the paths of the list of transferred files in the mail body has the effect that e.g. a "\n" is changed to a line feed

The files in the list of transferred files in the mail body can have backslashes in its paths if the source directory on Windows is configured with backslashes.
This has the effect that a "\n" in the paths are changed to a line feed.

We will change all backslashes to slashes

WORKAROUND:
Configure the source_dir with shlashes