public void Test163()    {      var imapServer = "imap.163.com";      var port = 993;      using (ImapClient client = new ImapClient(imapServer, port, "xxxx@163.com", "pwd", AuthMethod.Login, true))      {        // Returns a collection of identifiers of all mails matching the specified search criteria.        IEnumerable<uint> uids = client.Search(SearchCondition.Unseen());        // Download mail messages from the default mailbox.        IEnumerable<MailMessage> messages = client.GetMessages(uids,FetchOptions.HtmlOnly);        Console.WriteLine("We are connected!");      }    }

protected void Button2_Click(object sender, EventArgs e)  {    System.Net.Mail.SmtpClient client = new System.Net.Mail.SmtpClient();    client.Host = "smtp.163.com";//使用163的SMTP服務(wù)器發(fā)送郵件    client.UseDefaultCredentials = true;     client.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;     client.Credentials = new System.Net.NetworkCredential("用戶名", "密碼");//163的SMTP服務(wù)器需要用163郵箱的用戶名和密碼作認(rèn)證，如果沒(méi)有需要去163申請(qǐng)個(gè),                                         //這里假定你已經(jīng)擁有了一個(gè)163郵箱的賬戶，用戶名為abc，密碼為*******     System.Net.Mail.MailMessage Message = new System.Net.Mail.MailMessage();    Message.From = new System.Net.Mail.MailAddress("上述用戶名密碼所對(duì)應(yīng)的郵箱地址");//這里需要注意，163似乎有規(guī)定發(fā)信人的郵箱地址必須是163的，而且發(fā)信人的郵箱用戶名必須和上面SMTP服務(wù)器認(rèn)證時(shí)的用戶名相同                                    //因?yàn)樯厦嬗玫挠脩裘鸻bc作SMTP服務(wù)器認(rèn)證，所以這里發(fā)信人的郵箱地址也應(yīng)該寫為abc@163.com    Message.To.Add("目標(biāo)郵箱地址");//將郵件發(fā)送給Gmail    //Message.To.Add("123456@qq.com");//將郵件發(fā)送給QQ郵箱    Message.Subject = "customer feedback";    Message.Body = "customer feedback content";     Message.SubjectEncoding = System.Text.Encoding.UTF8;    Message.BodyEncoding = System.Text.Encoding.UTF8;    Message.Priority = System.Net.Mail.MailPriority.High;    Message.IsBodyHtml = true;    client.Send(Message);  }