require 'mail'

class EmailValidator < ActiveModel::EachValidator

  def validate_each(record,attribute,value)
    begin
      m = Mail::Address.new(value)
      r = m.domain && m.address == value
      t = m.__send__(:tree)
      r &&= (t.domain.dot_atom_text.elements.size > 1)
    rescue Exception => e      
      r = false  
    end
    record.errors[attribute] << (options[:message] || I18n.t( :invalid, :scope => [:activerecord, :errors, :messages] ) ) unless r
  end

end