Or at least make sure you have some type of plan document to have a family member or someone you trust assist, but having it done automatically is better. Unfortunately, other services like Gmail or what not may end up closing your account after a couple years. If you have your own domain, maybe see if you can prepay for email hosting for a few years as well.
My solution: make sure you keep your domains renewed to the maximum allowed by your registrar if you can. 10 years with dotcoms.