Based on the photo, it doesn not blow out the back., but just around the case.
Those temps you have aren't terrible if you don't have some monster fans and heatsinks, but you really should do some cable management, as they should be better. Even a pretty quiet rig like that shouldn't have a case temp more than 5C over ambient (typically 25-30C).
Spend some time getting cables out of the way, and make sure to have an intake fan (even at the expense of exhaust, unless your case has lots of air holes about it) for positive pressure.