This is a slight modification of my previous tutorial on the same topic for 13.10 since a couple of small things changed that mucked it up. Hope this helps!
I always open my email when I turn on my computer so I figured I could save a few steps and have it open automatically. It’s easier than I thought and you could apply this to other programs/applications as well (like Firefox, etc). It is reported this tutorial also works as far back as Ubuntu 12.04 as well.
So put on your seatbelt, kids! Here we go!
1. Press the Super Key and open your Dash and type ‘start’ and wait. It should bring up the ‘Startup Applications’ thingy below. Click it.