And how often do you need to clean up your email list? It's going to vary from list to list, but a decent rule of thumb is every six months - and certainly not more than a year. Getting rid of subscribers can sound frightening, but a smaller list of highly engaged subscribers is far more valuable to you than a larger list of subscribers who never open your emails. Are you ready to get started? Here's a comprehensive guide to why you need to clean up your email list and how to do it.