class ActionMailer::MailDeliveryJob

:nodoc:
Exceptions are rescued and handled by the mailer class.
sending either parameterized or normal mail.
want to send emails outside of the request-response cycle. It supports
The ActionMailer::MailDeliveryJob class is used when you
= Action Mailer MailDeliveryJob

def handle_exception_with_mailer_class(exception) 

def handle_exception_with_mailer_class(exception)
  if klass = mailer_class
    klass.handle_exception exception
  else
    raise exception
  end
end

def mailer_class

(like a Global ID reference) raised DeserializationError.
"Deserialize" the mailer class name by hand in case another argument 
def mailer_class
  if mailer = Array(@serialized_arguments).first || Array(arguments).first
    mailer.constantize
  end
end

def perform(mailer, mail_method, delivery_method, args:, kwargs: nil, params: nil) 

def perform(mailer, mail_method, delivery_method, args:, kwargs: nil, params: nil)
  mailer_class = params ? mailer.constantize.with(params) : mailer.constantize
  message = if kwargs
    mailer_class.public_send(mail_method, *args, **kwargs)
  else
    mailer_class.public_send(mail_method, *args)
  end
  message.send(delivery_method)
end