new_user_mailer

gistfile1.rb

class NewUserEmailer
  @queue = :emailer

  def self.perform(user_id)
    user = User.find(user_id)
    mail(:to => user.email, :subject => "Welcome #{user.name}")
  end
end

initializersredis.rb

require 'resque/server'
uri = URI.parse(ENV["REDISTOGO_URL"])
REDIS = Redis.new(:host => uri.host, :port => uri.port, :password => uri.password)

initializersresque.rb

Dir["#{Rails.root}/app/jobs/*.rb"].each { |file| require file }

ENV["REDISTOGO_URL"] ||= 'redis://redistogo:[email protected]:9640/'

uri = URI.parse(ENV["REDISTOGO_URL"])
Resque.redis = Redis.new(:host => uri.host, :port => uri.port, :password => uri.password)

Resque.after_fork = Proc.new { ActiveRecord::Base.establish_connection }
#Resque.before_fork = Proc.new { ActiveRecord::Base.establish_connection }

mailersnotification.rb

  def sign_up_confirmation(user)
    Resque.enqueue(NewUserEmailer, user.id)
  end

What an amazing gist.