C# 發送郵件到指定郵箱

• C#使用 System.Net.Mail發送郵件功能

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1. 注意要引用 System.Net.Mail
2. 使用163的SMTP服務器發送郵件，要提前申請一個授權碼。
3. 

4. public class EmailHelper
       {
           private readonly static string SmtpServer = "smtp.163.com";//smtp服務器
           private readonly static int SmtpServerPort = 25;
           private readonly static bool SmtpEnableSsl = false;
           private readonly static string SmtpUsername = "138******@163.com";//發件人郵箱地址
           private readonly static string SmtpDisplayName = "***科技";//發件人昵稱
           private readonly static string SmtpUserPassword = "655***";//授權碼
   
           /// <summary>
           /// 發送郵件到指定收件人
           /// </summary>
           /// <param name="to">收件人地址</param>
           /// <param name="subject">主題</param>
           /// <param name="mailBody">正文內容（支持HTML）</param>
           /// <param name="copyTos">抄送地址列表</param>
           /// <returns>是否發送成功</returns>
           public static bool Send(string to, string subject, string mailBody, params string[] copyTos)
           {
               return Send(new[] { to }, subject, mailBody, copyTos, new string[] { }, MailPriority.Normal);
   
           }
   
           /// <summary>
           /// 發送郵件到指定收件人
           /// </summary>
           /// <remarks>
           ///  2013-11-18 18:55 Created By iceStone
           /// </remarks>
           /// <param name="tos">收件人地址列表</param>
           /// <param name="subject">主題</param>
           /// <param name="mailBody">正文內容(支持HTML)</param>
           /// <param name="ccs">抄送地址列表</param>
           /// <param name="bccs">密件抄送地址列表</param>
           /// <param name="priority">此郵件的優先級</param>
           /// <param name="attachments">附件列表</param>
           /// <returns>是否發送成功</returns>
           /// <exception cref="System.ArgumentNullException">attachments</exception>
           public static bool Send(string[] tos, string subject, string mailBody, string[] ccs, string[] bccs, MailPriority priority, params Attachment[] attachments)
           {
               if (attachments == null)
                   throw new ArgumentNullException("attachments");
               if (tos.Length == 0)
                   return false;
               //創建Email實體
               var message = new MailMessage();
               message.From = new MailAddress(SmtpUsername, SmtpDisplayName);
               message.Subject = subject;
               message.Body = mailBody;
               message.BodyEncoding = Encoding.UTF8;
               message.IsBodyHtml = true;
               message.Priority = priority;
   
               //插入附件
               foreach (var attachent in attachments)
               {
                   message.Attachments.Add(attachent);
               }
               //插入收件人地址，抄送地址和密件抄送地址
               foreach (var to in tos.Where(t => !string.IsNullOrEmpty(t)))
               {
                   message.To.Add(new MailAddress(to));
               }
               foreach (var cc in ccs.Where(c => !string.IsNullOrEmpty(c)))
               {
                   message.CC.Add(new MailAddress(cc));
               }
               foreach (var bcc in bccs.Where(bc => !string.IsNullOrEmpty(bc)))
               {
                   message.Bcc.Add(new MailAddress(bcc));
               }
   
               //創建Smtp客戶端
               var client = new SmtpClient
               {
                   Host = SmtpServer,
                   Credentials = new NetworkCredential(SmtpUsername, SmtpUserPassword),
                   DeliveryMethod = SmtpDeliveryMethod.Network,
                   EnableSsl = SmtpEnableSsl,
                   Port = SmtpServerPort
               };
   
               //發送郵件
               client.Send(message);
   
               return true;
           }
   
       }