There are legitimate cases (public archives) where a user might
actually want their archive to be readable to the world.

"notmuch insert" historically used mode 0600 (unreadable by group or
other), but that choice doesn't appear to have been specifically
justified (perhaps an abundance of caution?).

If the user wants "notmuch insert" to create files that are not
readable by group or other, they can set their umask more
restrictively.
---
 notmuch-insert.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/notmuch-insert.c b/notmuch-insert.c
index 48490b51..167005db 100644
--- a/notmuch-insert.c
+++ b/notmuch-insert.c
@@ -227,7 +227,7 @@ maildir_mktemp (const void *ctx, const char *maildir, char 
**path_out)
            return -1;
        }
 
-       fd = open (path, O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0600);
+       fd = open (path, O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0644);
     } while (fd == -1 && errno == EEXIST);
 
     if (fd == -1) {
-- 
2.15.1

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