Use resumator or one of the other cheap apps for handling this. For most people a canned response is absolutely fine, it's the no-response that ticks people off.
We do make sure to respond (and provide feedback if asked) to everyone who applies. The issue that we're working on is our response usually comes 2-3 weeks after the initial submission.
Well 2-3 weeks ain't that bad. It's quite better than average for the industry.