using System;using System.Collections.Generic;using System.Linq;using System.Net.Mail;//发送邮箱using System.Text;using System.Threading.Tasks;namespace ConsoleApplication1{    class Program    {        static void Main(string[] args)        {            MailMessage mm = new MailMessage();//信            mm.Priority = MailPriority.High;            mm.To.Add("1024477951@qq.com");//收信邮箱            //mm.CC.Add();//抄送            mm.From = new MailAddress("1024477951@163.com");//发信邮箱            //mm.Attachments.Add(new Attachment(文件名))//文件附件            mm.Subject = "测试";            mm.BodyEncoding = Encoding.UTF8;            mm.Body = " 请假";//定义信的内容            mm.IsBodyHtml = true;//设置内容为html格式            // Smtp:简单邮件传输协议，发邮件   POP3 收邮件            SmtpClient sc = new SmtpClient();            sc.DeliveryMethod = SmtpDeliveryMethod.Network;//设置邮件通过网络发送            sc.Host = "smtp.163.com";//设置邮件服务地址            sc.Credentials = new System.Net.NetworkCredential("1024477951", "123");//验证发件人身份,"123abc"是发件人密码s            sc.Send(mm);            Console.WriteLine("发送成功！");        }    }}