gistfile1.rb

class MailReceiver < ActionMailer::Base

  # patch ActionMailer::Base to put a ActionMailer::Base#raw_email 
  # accessor on the created instance
  class << self
    alias :old_receive :receive
    def receive(raw_email)
      send(:define_method, :raw_email) { raw_email }
      self.old_receive(raw_email)
    end
  end

  ##
  # Injest email/MMS here

  def receive(tmail)
    # completely ignore the tmail object rails passes in Rails 2.*

    mail = Mail.new(self.raw_email)
    mms = MMS2R::Media.new(mail, :logger => Rails.logger)

    # do something
  end
end