c# 邮件发送

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using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.Net.Mail; using System.Net; using System.Text;   public partial class SendEmail : System.Web.UI.Page {     protected void Page_Load(object sender, EventArgs e)     {         SendMail();     }       private void SendMail()     {         string FromMial = "";         string ToMial = "";         string AuthorizationCode = "";         string ReplyTo = null;         string CCMial = null;         string File_Path = null;           SendMail(FromMial, ToMial, AuthorizationCode, ReplyTo, CCMial, File_Path);     }       private void SendMailFrom163ToQQ()     {         string FromMial = "18602702011@163.com";         string ToMial = "172237218@qq.com";         string AuthorizationCode = "guohu@2003";         string ReplyTo = null;         string CCMial = null;         string File_Path = null;           SendMail(FromMial, ToMial, AuthorizationCode, ReplyTo, CCMial, File_Path);     }         /// <summary>     /// 发送邮件方法     /// </summary>     /// <param name="FromMial">发件人邮箱</param>     /// <param name="ToMial">收件人邮箱(多个收件人地址用";"号隔开)</param>     /// <param name="AuthorizationCode">发件人授权码</param>     /// <param name="ReplyTo">对方回复邮件时默认的接收地址（不设置也是可以的）</param>     /// <param name="CCMial">//邮件的抄送者(多个抄送人用";"号隔开)</param>     /// <param name="File_Path">附件的地址</param>     public void SendMail(string FromMial, string ToMial, string AuthorizationCode, string ReplyTo, string CCMial, string File_Path)     {         try         {             //实例化一个发送邮件类。             MailMessage mailMessage = new MailMessage();               //邮件的优先级，分为 Low, Normal, High，通常用 Normal即可             mailMessage.Priority = MailPriority.Normal;               //发件人邮箱地址。             mailMessage.From = new MailAddress(FromMial);               //收件人邮箱地址。需要群发就写多个             //拆分邮箱地址             List<string> ToMiallist = ToMial.Split(';').ToList();             for (int i = 0; i < ToMiallist.Count; i++)             {                 mailMessage.To.Add(new MailAddress(ToMiallist[i]));  //收件人邮箱地址。             }               if (ReplyTo == "" || ReplyTo == null)             {                 ReplyTo = FromMial;             }               //对方回复邮件时默认的接收地址(不设置也是可以的哟)             mailMessage.ReplyTo = new MailAddress(ReplyTo);               if (CCMial != "" && CCMial != null)             {                 List<string> CCMiallist = ToMial.Split(';').ToList();                 for (int i = 0; i < CCMiallist.Count; i++)                 {                     //邮件的抄送者，支持群发                     mailMessage.CC.Add(new MailAddress(CCMial));                 }             }             //如果你的邮件标题包含中文，这里一定要指定，否则对方收到的极有可能是乱码。             mailMessage.SubjectEncoding = Encoding.GetEncoding(936);               //邮件正文是否是HTML格式             mailMessage.IsBodyHtml = false;               //邮件标题。             mailMessage.Subject = "发送邮件测试";             //邮件内容。             mailMessage.Body = "测试群发邮件,以及附件邮件！.....";               //设置邮件的附件，将在客户端选择的附件先上传到服务器保存一个，然后加入到mail中              if (File_Path != "" && File_Path != null)             {                 //将附件添加到邮件                 mailMessage.Attachments.Add(new Attachment(File_Path));                 //获取或设置此电子邮件的发送通知。                 mailMessage.DeliveryNotificationOptions = DeliveryNotificationOptions.OnSuccess;             }               //实例化一个SmtpClient类。             SmtpClient client = new SmtpClient();               #region 设置邮件服务器地址               //在这里我使用的是163邮箱，所以是smtp.163.com，如果你使用的是qq邮箱，那么就是smtp.qq.com。             // client.Host = "smtp.163.com";             if (FromMial.Length != 0)             {                 //根据发件人的邮件地址判断发件服务器地址   默认端口一般是25                  string[] addressor = FromMial.Trim().Split(new Char[] { '@', '.' });                 switch (addressor[1])                 {                     case "163":                         client.Host = "smtp.163.com";                         break;                     case "126":                         client.Host = "smtp.126.com";                         break;                     case "qq":                         client.Host = "smtp.qq.com";                         break;                     case "gmail":                         client.Host = "smtp.gmail.com";                         break;                     case "hotmail":                         client.Host = "smtp.live.com";//outlook邮箱                         //client.Port = 587;                         break;                     case "foxmail":                         client.Host = "smtp.foxmail.com";                         break;                     case "sina":                         client.Host = "smtp.sina.com.cn";                         break;                     case "chnenergy":                         client.Host = "mail.chnenergy.com.cn";                         client.Port = 465;                         break;                     default:                         client.Host = "smtp.exmail.qq.com";//qq企业邮箱                         break;                 }             }             #endregion               //使用安全加密连接。             client.EnableSsl = true;             //不和请求一块发送。             client.UseDefaultCredentials = false;               //验证发件人身份(发件人的邮箱，邮箱里的生成授权码);             client.Credentials = new NetworkCredential(FromMial, AuthorizationCode);               //如果发送失败，SMTP 服务器将发送 失败邮件告诉我              mailMessage.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure;             //发送             client.Send(mailMessage);             Response.Write("发送成功");         }         catch (Exception ex)         {             throw new Exception(ex.Message);         }     } }