If the process inside spawn fails

Hi     I have used spawn pluggin successfully in my test rails project(will use in original) for spawning process http://rubyforge.org/projects/spawn/

My controller code as below class UserController < ApplicationController def create t=spawn do   sending_mail_function(@user) end

def sending_mail_function(user) d=LateNotice.deliver_late_timesheet(user) end

end end

LateNotice is classs derived from action mailer..My question is suppose sending mail function failured how can I track that?Just for example after clicking mail send button i ahve to send 3 mails to a particular user. I am disconnecting the LAN cable(just for example)..So in that case also a new spawn id is returned and the execution after spawn will continue..But actually mail not send..How can I track this in above

Sijo