Delay Rails 2.x mailers

delayed_mailer.rb

# Handle mail delivery in the background. Only the minimum amount of data should go in the job not
# the fully rendered email content. 
# I haven't tested this but some variant should work.
ActionMailer::Base.class_eval do
  def self.create_and_deliver!(message, *parameters)
    new(message, *parameters).deliver!
  end
  
  def method_missing_with_delay(method_symbol, *parameters)#:nodoc:
    case method_symbol.id2name
      when /^deliver_([_a-z]\w*)/ then self.class.create_and_deliver!($1, *parameters)
      else method_missing_without_delay(method_symbol, *parameters)
    end
  end
  
  alias_method_chain :missing_method, :delay
end