listener_controller.rb

def receive_email
  from = find_email(params["from"]).downcase
  
  tracking_number = Tracking::Extractor.extract(params["text"])
  
  if tracking_number.blank?
    PostOffice.email_tracking_failure(from, "We could not find a valid tracking number in your email.").deliver
  else
    tracking_number.each do |tracking|
      user = User.first(:conditions => ["email_forwards LIKE ?", "%#{from}%"])
      user = User.find_by_email(from) unless user
      
      if user
        @number = Number.where(:tracking => tracking).first

        if @number.blank?
          @number = Number.new(:tracking => tracking)
          @number.user_id = user.id
          @number.notes = params["subject"]
          @number.track
        end
      else
        PostOffice.email_tracking_failure(from, "Could not find a user with the email #{from}")
      end
    end
  end
                        
  respond_to do |format|
    format.xml
  end                      
end