Filter functions are available in most Email accounts and most Email Clients (like MS Outlook, we mean all programs that are able to write, send, receive and manage mail). This enables you to sort your Emails using automatic rules. The idea is simple. Whenever you get an Email, it has characteristic attributes that can be used to categorize it.
One wide-spread idea is to make folders for different classes of people you get Email from. One category may be "family" - set a rule that moves all Email coming from family members into this folder. If your family is made up of Email fanatics, you possibly should make sub folders for family with names like "mum", "dad", "Paul", "Susan", and so on. When doing so, don't make a rule that moves Email into the family folder. Delete this rule, and set up rules that filter in the refined way.
Another folder may be "friends" where sub folders with names of your friends can be found where Email is sorted by the sender (your friend) and put into the correct sub folder. Summing up: Find a structure to manage your mail using folders as in the physical world, and create rules in your favorite Email client that sort the Emails into these folders.