When you turn off sync for the email account configured on your mobile, it may result in contact removal or loss of saved backups and accounts. If you still wish to stop syncing email on your mobile, follow the below-mentioned steps.
On your Android phone, tap the Settings icon on the home screen to open the Settings app.
Scroll down the Settings window and tap on Accounts and Backup.
You can also select Accounts & Sync, Data Synchronization, or Cloud and Accounts if you are not able to access the Accounts and Backup option.
Next, tap on Accounts and select your Google account from the displayed list.