The email account has been configured as the default email account for the phone.
On the iPhone, you can go to Settings -> Mail, Contacts, Calendars -> Add Account -> Other. Choose the account you want to delete and tap “Delete Account”.
You can’t do this on an iPhone. You would need to delete the email account from your computer and sync the changes with your phone.
To erase an email account, you will need to log in to your account and select the “Delete Account” option.
