class ActionMailer::DeliveryJob

:nodoc:
want to send emails outside of the request-response cycle.
The ActionMailer::DeliveryJob class is used when you

def perform(mailer, mail_method, delivery_method, *args) # :nodoc:

:nodoc: 
def perform(mailer, mail_method, delivery_method, *args) # :nodoc:
  mailer.constantize.public_send(mail_method, *args).send(delivery_method)
end