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方案1： 通过使用合适的主机上的网站提交的电子邮件的形式发送邮件（远程登录工作正常，在端口25）正常工作我们本地系统上（其中代码是完全一样的）和我们发送的次数一样多（不管连续提交的时间间隔是多少）。在提交表格时，我们会在提及的电子邮件地址中回复回复。System.Net.Mail.SmtpException：发送邮件失败 - SMTP问题
方案2： 但是，当我们提交关于服务器的形式，它发送邮件成功第1次和我们得到的响应返回给使用的电子邮件地址。 当我们尝试第二次提交表单时，如果在2分钟30秒的间隔（已验证但未确定其配置位置）之前尝试失败，并且如果我们尝试在2分钟后提交表单，则失败30秒。
在服务器上，这是日志，我们得到：
System.Net.Mail.SmtpException: Failure sending mail. ---> System.Net.WebException:
Unable to connect to the remote server ---> System.Net.Sockets.SocketException:
A connection attempt failed because the connected party did not
properly respond after a period of time, or established connection
failed because connected host has failed to respond <SMTP server IP>:25
at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress
socketAddress)
at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure,
Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state,
IAsyncResult asyncResult, Exception& exception)
--- End of inner exception stack trace ---
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.ConnectionPool.GetConnection(Object owningObject, GeneralAsyncDelegate
asyncCallback, Int32 creationTimeout)
at System.Net.Mail.SmtpConnection.GetConnection(ServicePoint servicePoint)
at System.Net.Mail.SmtpClient.Send(MailMessage message)
--- End of inner exception stack trace ---
任何一个可以请解释一下其中可能出现的问题？
非常感谢！