Our email overload comes down to two things: too much quantity and needing to scan through bunch of emails that makes it almost impossible to get what you actually need. To fix the first issue, try Gmail's Priority Inbox.
Once turned on, the feature sorts your email into four main categories: Primary, Social, Promotions and Updates. You can drag and drop emails to move them between categories, but this system will let you weed out the hundreds of shopping newsletters you were probably never going to read and keeps the important stuff right in front of you.
Here is the trick: Copy and paste "category:primary" into the search bar and it'll show up all the important emails that you want to search through. There it is! Use it and never worry about email overload again.