Delayed Job

confirmations_controller.rb

 def create
    if @confirmation.save
      OrderMailer.delay.order_notification(@order)

delayed_job_config.rb

Delayed::Worker.max_attempts = 3
Delayed::Worker.delay_jobs = !Rails.env.test?
Delayed::Worker.destroy_failed_jobs = false
Delayed::Worker.sleep_delay = 120

order_mailer.rb

class OrderMailer < ActionMailer::Base
  default from: "email@example.com"

  def order_notification(order)
    @order = order
    mail(to: order.confirmation.email, bcc: 'email@example.com',
       subject: "New Order Recieved")
  end
end