1- first add the domain to your Cloudflare account and activate it. 

2- click on your domain name > email >  Enable Email Routing

3- Click on “add record and enable”.

4- Come to “Routing Rules” and click on “Create address” 

5- Give “username” for an email address, Action = “send to and email”, Destination =  “Email address” where you want to get emails. 

6- Cloudflare sends you a verification email on your “Destination Email Address” Open your email and click on the “Verify email address” button

7- now send a test email, and check magic.