email_validator.rb

# -*- coding: utf-8 -*-
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] << "Неверный формат email." unless r
  end
end