Unable to complete error managing due to : 
System.Net.Mail.SmtpException: Error in processing. The server response was: Timeout waiting for client input
   at System.Net.Mail.MailCommand.CheckResponse(SmtpStatusCode statusCode, String response)
   at System.Net.Mail.MailCommand.Send(SmtpConnection conn, Byte[] command, String from)
   at System.Net.Mail.SmtpTransport.SendMail(MailAddress sender, MailAddressCollection recipients, String deliveryNotify, SmtpFailedRecipientException& exception)
   at System.Net.Mail.SmtpClient.Send(MailMessage message)
   at ASPNetPortal.Global.SendMail(String Mail, String MailLinkedFile)
   at ASPNetPortal.Global.SendErrorMail(Object oContext)
   at ASPNetPortal.Global.Application_Error(Object sender, EventArgs args)