Just as an amendment to this, filtering is another method you can use to avoid IJ notifications messages being marked as spam:
Step 1: http://i45.tinypic.com/10hsj9k.jpg
Step 2: http://i46.tinypic.com/2qtb96x.jpg
Step 3: http://i48.tinypic.com/mrfkgl.jpg
Step 1: http://i45.tinypic.com/10hsj9k.jpg
Step 2: http://i46.tinypic.com/2qtb96x.jpg
Step 3: http://i48.tinypic.com/mrfkgl.jpg