SMTP邮箱发送

1.使用的QQ邮箱，其他也可以但是服务器名称不同

2.在QQ邮箱的邮箱设置的账户中开启SMTP服务

3.开启SMTP服务后会得到授权码(用来发邮件)

4.执行代码

　　　　　/// <summary>
        /// 邮箱发送
        /// </summary>
        /// <param name="userName">用户名称</param>
        /// <param name="pwd">授权码</param>
        /// <param name="server">服务器名称</param>
        /// <param name="toEmail">要发送的邮箱地址</param>
        /// <param name="title">标题</param>
        /// <param name="content">内容</param>
        public static void Mail(string userName, string pwd, string server, string toEmail, string title, string content)
        {
            using (MailMessage mailMessage = new MailMessage())
            using (SmtpClient smtpClient = new SmtpClient(server))
            {

                mailMessage.To.Add(toEmail);

                mailMessage.Body = content;

                mailMessage.From = new MailAddress(userName);

                mailMessage.Subject = title;

                smtpClient.Credentials = new System.Net.NetworkCredential(userName, pwd);
                //如果启用了“客户端授权码”，要用授权码代替密码 

                smtpClient.Send(mailMessage);
            }
       }