Weird delayed_job behaviour
class User < ActiveRecord::Base
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable
  attr_accessible :email, :password, :password_confirmation, :remember_me, :country, :phone_number, :opt_in

  def email=(email)
    super
    Delayed::Job.enqueue self
  end

  def perform
    begin
      UserMailer.welcome_email self
    rescue => e
      STDERR.puts "Cannot perform the mailer: #{e}"
    end
  end
end

def  create
   user = User.new({:email => params[:email],
                      :password => params[:password],
                      :password_confirmation => params[:password_confirmation],
                      :country => params[:country],
                      :opt_in => Boolean(params[:opt_in]),
                      :phone_number => params[:phone_number]})

      if user.save(:validate => false)
        redirect_to wrap_users_path
      end
end