Most, if not all, businesses heavily rely on email to communicate to its own employees or to customers and vendors externally. Maintaining a seamless email system is important to allowing workers to check email and communicate effectively. Part of a seamless email system is a spam filter. However, a problem with many spam filters out there is that they don’t know how to correctly classify emails as spam. And that may never be possible—even valid emails, ones which a user has even requested to receive, may end up in the spam folder.