gift_mailer.rb

module Quarterly
  class GiftMailer < Spree::BaseMailer
    def send_it(user, order, plan)
      @user, @order, @plan = user, order, plan

      subject = "#{Spree::Config[:site_name]} Your gift from #{@plan.name}"
      mail(to: @order.gift_email, from: from_address, subject: subject)
    end
    handle_asynchronously :send_it, 
      :run_at => Proc.new { 2.minutes.from_now }

  end
end