teste.rb

class MailerWorker
  include Qe::Worker

  def perform
    # ChangePasswordMailer.public_send(options[:mail], options).deliver # da erro que nil não pode ser enviado ao public_send
    ChangePasswordMailer.public_send(options["mail"], options).deliver
  end
end

class ChangePasswordMailer < ActionMailer::Base
  def new_password_mail(options)
    @usuario = options["name"]
    @subject = options["subject"] || "Nova senha para acesso ao GVAR"
  
    mail(:to => options["email"], :subject => @subject)
  end
end

# e no controller:
MailerWorker.enqueue({
  :mail     => :new_password_mail,
  :name     => user.name,
  :email    => user.email
})