ASP.Net Core Identity UI 2.1 EmailSender

EmailSender.cs

using Microsoft.AspNetCore.Identity.UI.Services;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace MailSenderApp.Services {
    public class EmailSender : IEmailSender {
        public Task SendEmailAsync(string email, string subject, string htmlMessage) {
            throw new NotImplementedException();
        }
    }
}