How often should you check your e-mail?

I think it is safe to say that e-mailing is today one of our most used ways of communicating with each other. And it has its merits. But any tool not used properly and without clear intentions, is an inefficient or even a bad tool. And not having a defined way of using your e-mail tends to create more stress than it should. So today Done! is about how to better handle the usage of your e-mail and hence make it into the powerful structural tool that it actually is.