Two Harvard law school students have created an email service inspired by Snapchat. Like the photo sharing app, Pluto Mail lets people send emails that will expire. The idea is that not everyone wants their digital trail hanging around to haunt them. “When you have a conversation in real life, it doesn’t follow you for the rest of your life," explained David Gobaud, one of the founders to The Wall Street Journal. "Sure, there are some business emails or emails related to a contract you might want to keep but most other emails, you want them to go away."