Delete email address on iphone not in contacts. Reset?

How to delete the history on iphone? For example, you're going to email someone and when you type something on the email address part, it will show some email addresses that you've typed before. How can you delete all those so it will be cleared and won't show any email address. And those email addresses are not on my contacts. How do you delete it or reset it?

Go to contacts icon and find person you want to change email and hit edit?

I know that on gmail you can choose for these email addresses not to show up