Send SMTP mail from Proxy Server

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VB

I am on Proxy Server and want to send mail via gmail.but each time it shows message that "Unable to Connect to Remote Server".Please give me Solution .My Code is


Using smtp As New SmtpClient(127.0.0.1)
Using smtp As New SmtpClient("192.168.0.99")
smtp.EnableSsl = True
smtp.UseDefaultCredentials = True
smtp.DeliveryMethod = SmtpDeliveryMethod.Network
smtp.Timeout = 2000000
smtp.Credentials = New System.Net.NetworkCredential(txtUser.Text, txtPassword.Text, "smtp.gmail.com")
smtp.Port = 25
Dim UserToken As String = "test message1"
'smtp.SendAsync(mail, UserToken)
smtp.Send(mail)
End Using