Go to Settings and select the passwords and account option.
In here you will see your accounts listed for example: Test Gmail . You would tap on this account. (Test Gmail).
The last option in this list says delete account and then it should ask if you are sure you want to delete the account.
I find this kind of confusing as well since it is not listed anywhere under mail in settings.
Comments
Deleting an Email Account
Go to Settings and select the passwords and account option.
In here you will see your accounts listed for example: Test Gmail . You would tap on this account. (Test Gmail).
The last option in this list says delete account and then it should ask if you are sure you want to delete the account.
I find this kind of confusing as well since it is not listed anywhere under mail in settings.