When it rains, we talk a lot about email. For the diehard email marketers, welcome to Captiva Island, Fla. for the Email Insider Summit. For those not attending, follow the event at #MPEIS. I've programmed this event the last four times and I'm not sure what's in the air, but there was a lot more demand to speak and be involved in this event. There's a new energy it seems: businesses are strong, marketers' outlooks are bright, and the vendors in the space have a hop in their step.