我碰到情况如下：

1.通过SSL加密发送

2.通过ssl.alibaba-inc.com服务器，端口465发送邮件提示“操作已超时”

3.代码没变，发送126,gmail不管是普通邮件还是日程都可以发送成功!

Code:

  string hostServer = "ssl.alibaba-inc.com";
  string email = myemail;
  string authName = name;
  string password = mypassword;
  int port = 465;

   MailMessage msg = new MailMessage(email, EmailAddress.Text.Trim());
   msg.Body = "hello!";
   msg.Subject = "hello";
   SmtpClient smtp = new SmtpClient();
   smtp.Credentials = new NetworkCredential(email, password);
   smtp.Port = 465;
   smtp.Host = "ssl.alibaba-inc.com";
   smtp.EnableSsl = true;
   smtp.Timeout = 50000;
   try
   {
    smtp.Send(msg);
   }
   catch (SmtpException ex)
   {
    ex.ToString();
   }