The PasswordRecovery.SendMailError event is raised when the SMTP mail server throws an exception when trying to send an e-mail message.
The default PasswordRecovery.SendMailError event does not handle the SMTP error from the mail system. The method that handles the PasswordRecovery.SendMailError event must set the SendMailErrorEventArgs.Handled property of the System.Web.UI.WebControls.SendMailErrorEventArgs object to true to handle the error and prevent it from being displayed to the user.
For more information about handling events, see Handling and Raising Events.