Mass mailing through ar_mailer - error

Hi:

I am trying to use ar_mailer for sending mass mail.
The model file looks like
class Email < ActionMailer::ARMailer
  def testmail
    recipients "..."
    from "....."
    subject "TEST MAIL SUBJECT"
    body "<br>TEST MAIL MESSAGE"
    content_type "text/html"
  end
end
where .... is the email address

I have made this entry in environment.rb
require 'action_mailer/ar_mailer'

and this in development.rb
ActionMailer::Base.delivery_method = :activerecord

(since im in development env)

i have the table called emails with structure
CREATE TABLE `emails` (
  `from` varchar(255) NOT NULL,
  `to` varchar(255) NOT NULL,
  `last_send_attempt` int(11) NOT NULL default '0',
  `mail` text NOT NULL,
  `created_on` date NOT NULL
)

When i try to call the method testmail it returns me an error saying..
NoMethodError in UserController#test_mail

undefined method `create' for Email:Class

Plz can anybody guide me in the right direction.

TIA..

Best Regards,
Priya Saini