为什么我收到异常尝试使用smtp发送电子邮件失败？

Question

public void sendit()
        {
            try
            {

                SmtpClient mySmtpClient = new SmtpClient("out.bezeqint.net");

                // set smtp-client with basicAuthentication
                mySmtpClient.UseDefaultCredentials = false;
                mySmtpClient.Port = 110;
                mySmtpClient.EnableSsl = true;
                System.Net.NetworkCredential basicAuthenticationInfo = new
                   System.Net.NetworkCredential("myuser", "mypass");
                mySmtpClient.Credentials = basicAuthenticationInfo;

                // add from,to mailaddresses
                MailAddress from = new MailAddress("test@bezeqint.net", "TestFromName");
                MailAddress to = new MailAddress("test@bezeqint.net", "TestToName1");
                MailMessage myMail = new System.Net.Mail.MailMessage(from, to);

                // add ReplyTo
                MailAddress replyto = new MailAddress("test@bezeqint.net");
                myMail.ReplyToList.Add(replyto);

                // set subject and encoding
                myMail.Subject = "Test message";
                myMail.SubjectEncoding = System.Text.Encoding.UTF8;

                // set body-message and encoding
                myMail.Body = "<b>Test Mail</b><br>using <b>HTML</b>.";
                myMail.BodyEncoding = System.Text.Encoding.UTF8;
                // text or html
                myMail.IsBodyHtml = true;

                mySmtpClient.Send(myMail);
            }

            catch (SmtpException ex)
            {
                throw new ApplicationException
                  ("SmtpException has occured: " + ex.Message);
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

例外情况发生在第一次捕获。

"Failure sending mail."

StackTrace

at System.Net.Mail.SmtpClient.Send(MailMessage message)
   at Emails\SendEmail.cs:line 150

第150行

mySmtpClient.Send(myMail);

客户端bezeqint至少是用于获取/下载我正在使用openpop的电子邮件的pop3。但是发送电子邮件我正在使用smtp并获得例外。

在form1的顶部

using System.Net.Mail;

有关例外的更多信息：

[System.Net.WebException] = {“无法连接到远程服务器”}

和StackTrace

at System.Net.ServicePoint.GetConnection(PooledStream PooledStream, Object owner, Boolean async, IPAddress& address, Socket& abortSocket, Socket& abortSocket6)
   at System.Net.PooledStream.Activate(Object owningObject, Boolean async, GeneralAsyncDelegate asyncCallback)
   at System.Net.PooledStream.Activate(Object owningObject, GeneralAsyncDelegate asyncCallback)
   at System.Net.ConnectionPool.GetConnection(Object owningObject, GeneralAsyncDelegate asyncCallback, Int32 creationTimeout)
   at System.Net.Mail.SmtpConnection.GetConnection(ServicePoint servicePoint)
   at System.Net.Mail.SmtpTransport.GetConnection(ServicePoint servicePoint)
   at System.Net.Mail.SmtpClient.GetConnection()
   at System.Net.Mail.SmtpClient.Send(MailMessage message)

和InnerException

InnerException = {“连接尝试失败，因为连接方在一段时间后没有正确响应或建立的连接失败，因为连接的主机无法响应192.115.187.185:110”}