多的不说直接上代码

class UserMailer < Devise::Mailer  
  # customize mail format
  def user_feedback(opts={})
    @v = "Hello"
    @opts = opts
    mail(:to => "[email protected]", :bcc => ["[email protected]"],  :subject => "Test")
  end

  handle_asynchronously :user_feedback     
end

class MailsController < ApplicationController
  def feedback      
    options[:feedback_time] = Time.now.strftime("%Y%m%d %H:%M:%S")
    UserMailer.user_feedback(options).deliver
  end
end

启动 worker

rake jobs:workoff

log

[Worker(host:localhost.localdomain pid:2899)] Starting job worker
[Worker(host:localhost.localdomain pid:2899)] Job Delayed::PerformableMethod (id=18) RUNNING
[Worker(host:localhost.localdomain pid:2899)] No more jobs available. Exiting

不太懂了，顺便提一下 rails 版本是 4.0.4