The Arduino makes a great platform for alert systems because it doesn’t need additional parts, other than an LED or motor. [Torchris] made email notifier, and used an Ethernet shield to make it standalone. The Arduino polls your POP server seeing if there are unread emails. POP is an incredibly simple protocol, even simpler than HTTP; this made it easy to communicate with, even with little processing power. He hopes to add a servo or serial display to present the data better, but his current system seems to work well. Video of it in action after the break.