C# 使用smtp发送邮件

//简单邮件传输协议类
            System.Net.Mail.SmtpClient client = new System.Net.Mail.SmtpClient();
            client.Host = "smtp.163.com";//邮件服务器
            client.Port = 25;//smtp主机上的端口号,默认是25.
            client.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;//邮件发送方式:通过网络发送到SMTP服务器
            client.Credentials = new System.Net.NetworkCredential("panthervic", "123456");//凭证,发件人登录邮箱的用户名和密码

            //电子邮件信息类
            System.Net.Mail.MailAddress fromAddress = new System.Net.Mail.MailAddress("panthervic@163.com", "小明");//发件人Email,在邮箱是这样显示的,[发件人:小明<panthervic@163.com>;]
            System.Net.Mail.MailAddress toAddress = new System.Net.Mail.MailAddress("43327681@163.com", "小红");//收件人Email,在邮箱是这样显示的, [收件人:小红<43327681@163.com>;]
            System.Net.Mail.MailMessage mailMessage = new System.Net.Mail.MailMessage(fromAddress, toAddress);//创建一个电子邮件类
            mailMessage.Subject = "邮件的主题";
            string filePath = Server.MapPath("/index.html");//邮件的内容可以是一个html文本.
            System.IO.StreamReader read = new System.IO.StreamReader(filePath, System.Text.Encoding.GetEncoding("GB2312"));
            string mailBody = read.ReadToEnd();
            read.Close();
            mailMessage.Body = mailBody;//可为html格式文本
            //mailMessage.Body = "邮件的内容";//可为html格式文本
            mailMessage.SubjectEncoding = System.Text.Encoding.UTF8;//邮件主题编码
            mailMessage.BodyEncoding = System.Text.Encoding.GetEncoding("GB2312");//邮件内容编码
            mailMessage.IsBodyHtml = true;//邮件内容是否为html格式
            mailMessage.Priority = System.Net.Mail.MailPriority.High;//邮件的优先级,有三个值:高(在邮件主题前有一个红色感叹号,表示紧急),低(在邮件主题前有一个蓝色向下箭头,表示缓慢),正常(无显示).
            try
            {
                client.Send(mailMessage);//发送邮件
                //client.SendAsync(mailMessage, "ojb");异步方法发送邮件,不会阻塞线程.
            }
            catch (Exception)
            {
            }