You can block someone on Gmail app easily. You all have Android phones. Gmail app is inbuilt app there. iPhone users can use browser because in Gmail app, block option is not available yet.
1.Open your Gmail app and sign in.
2.Type the mail of that person whom you want to block in search box. Type only two alphabets, Gmail will easily search it for you.
3.Open the mail of this Email ID. Tap on three dots at the top right corner.
4.Tap on the option showing ‘block the user (user’s name).
5.Tap ‘block’ option. You can see ‘cancel’ option in the left if you don’t want to block. 6.Now the mail has been blocked from your Gmail app.