More people need the 3 email system.
Junk Email – for random site sign ups and other things that might lead to your email being shared to dodgy people.
Personal Email – for friends and family, as well as paid sites and things connected to your personal life and more “reputable” sites like youtube or facebook.
Professional Email – For work or school related things and people you don’t want to have your personal email. Purely real life dealings.
This way you’re more likely to pick out spam and phishing emails, as well as having a clear divide between all the aspects of your life. It’s a lot easier to find things and you have more privacy. Plus you can email yourself things, like documents, pictures, or creative works for safe keeping.