Recover password not working

I am trying to use the asp.net contol recover password in my web page I cna load the page and enter the username and answer to the question fine but when I click on the submit button I get an error message saying System.Net.Mail.SmtpException: The operation has timed out
the stack trace is
SmtpException: The operation has timed out.]
   System.Net.Mail.SmtpClient.Send(MailMessage message) +1426
   System.Web.UI.WebControls.LoginUtil.SendPasswordMail(String email, String userName, String password, MailDefinition mailDefinition, String defaultSubject, String defaultBody, OnSendingMailDelegate onSendingMailDelegate, OnSendMailErrorDelegate onSendMailErrorDelegate, Control owner) +367
   System.Web.UI.WebControls.PasswordRecovery.AttemptSendPasswordQuestionView() +522
   System.Web.UI.WebControls.PasswordRecovery.AttemptSendPassword() +69
   System.Web.UI.WebControls.PasswordRecover ...