EmailSender.cs

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

namespace AutoService
{
    /// <summary>
    /// Class EmailSender.
    /// </summary>
    /// <seealso cref="Microsoft.AspNetCore.Identity.UI.Services.IEmailSender" />
    public class EmailSender : IEmailSender
    {

        // Our private configuration variables
        private string _host;
        private int _port;
        private bool _enableSsl;
        private string _userName;
        private string _password;


        /// <summary>
        /// Initializes a new instance of the <see cref="EmailSender"/> class.
        /// </summary>
        /// <param name="host">The host.</param>
        /// <param name="port">The port.</param>
        /// <param name="enableSSL">if set to <c>true</c> [enable SSL].</param>
        /// <param name="userName">Name of the user.</param>
        /// <param name="password">The password.</param>
        public EmailSender(string host, int port, bool enableSSL, string userName, string password)
        {
            this._host = host;
            this._port = port;
            this._enableSsl = enableSSL;
            this._userName = userName;
            this._password = password;
        }

        /// <summary>
        /// Sends the email asynchronous.
        /// </summary>
        /// <param name="email">The email.</param>
        /// <param name="subject">The subject.</param>
        /// <param name="htmlMessage">The HTML message.</param>
        /// <returns>Task.</returns>
        public Task SendEmailAsync(string email, string subject, string htmlMessage)
        {
            var client = new SmtpClient(_host, _port)
            {
                Credentials = new NetworkCredential(_userName, _password),
                EnableSsl = _enableSsl
            };
            return client.SendMailAsync(
                new MailMessage(_userName, email, subject, htmlMessage) { IsBodyHtml = true }
            );
        }
    }
}