MailMessage mmsg = new MailMessage(); mmsg.Subject = "邮件标题"; mmsg.Body = "邮件内容"; mmsg.To.Add("accept@qq.com");//接收邮箱 byte[] bytes = System.Text.Encoding.Default.GetBytes (@"<table><tr><td width=150>1234567891234567 </td><td width=80>12345678</td></tr></table>"); MemoryStream ms = new MemoryStream(bytes); ContentType ct = new ContentType(); //附件文件类型 ct.MediaType = MediaTypeNames.Text.Html; //附件名称，可以是其它后缀名 ct.Name = "附件名称" + DateTime.Now.ToString() + ".html"; mmsg.Attachments.Add(new Attachment(ms, ct)); //SMTP简单邮件协议 System.Net.Mail.SmtpClient sc = new System.Net.Mail.SmtpClient(); sc.Host = "127.0.0.1";//主机地址 sc.Port = 25;//端口 //发送邮箱账号和密码 sc.Credentials = new System.Net.NetworkCredential("account", "password"); //发送邮箱 mmsg.From = new MailAddress("account@qq.com"); sc.Send(mmsg); //释放流资源 ms.Close(); ms.Dispose();