diff --git a/markup/views.py b/markup/views.py
index 21cd1d8..708e65b 100644
--- a/markup/views.py
+++ b/markup/views.py
@@ -36,6 +36,7 @@ def submit(request):
     _, tmpfile = mkstemp(suffix='.eml', prefix='markup_', dir=None, text=False)
     log.debug('copy message file from {} to {}'.format(msg_file.temporary_file_path(), tmpfile))
     copyfile(msg_file.temporary_file_path(), tmpfile)
+    os.chmod(tmpfile, 0o666)
 
     process_message.delay(tmpfile)