Kicksend uses the tried and tested pattern of sending our new users confirmation emails to verify their identity. With that, there will always be emails that aren’t delivered successfully, which we care about a lot.
A bounced confirmation email means that our new user wouldn’t have been able to activate their account. So they’ll either have to either sign up for a new account, or contact us to change their email address. These are steps we don’t want to put any user through.

I'm lucky enough not to be drowning in email, so keeping my inbox clean doesn't require zen-like discipline. But for everyone else out there for whom "Inbox Zero" is a fantasy at best, there's a handy web-app called "The Email Game," which uses clever game mechanics to -- as I previously put it when we first covered the product -- "make email your bitch, not the other way around." But the game's creators haven't been sitting on their laurels since then: they've just released an updated version of the game with a better design.