When saving emails to your SharePoint, you will have better experience if you add additional columns to your SharePoint for data like "who sent the email", "the date the email was sent" and other information. 
This is known as metadata, to capture this so you can search on it, we need to add additional columns to your SharePoint libraries.

The below video shows you step by step how to add these additional columns to your SharePoint libraries:

There is also more detailed step by step instructions, including how to do this manually at our website here:
How to add email columns