rails email validator?

Main.rb

class Main
  validate :email_is_valid

  def email_is_valid
    vtools = Tools.new
    unless vtools.email_valid?(self.email)
      logger.error("Invalid Email Domain :: PID: #{$$} EmailDomain: '#{vtools.domain}' ::")
      errors.add(:base, "Invalid Email Address.")
    end
  end
  
end

validate_tool.rb

class Tools

  attr_reader :domain, :is_domain_registered, :is_domain_operational


  def email_valid?(email_string)
    email = Mail::Address.new(email_string)
    email.domain.present? && domain_valid?(email.domain)
  end


  def domain_valid?(domain)
    @domain = domain
    @is_domain_registered  = domain_registered?
    @is_domain_operational = domain_operational?
    @is_domain_registered || @is_domain_operational
  end






  private


  def domain_registered?
    begin
      lookup = Whois.whois(@domain)
      lookup.registered?
    rescue Whois::ServerNotFound
      false
    end
  end


  def domain_operational?
    begin
      true if Resolv.getaddress(@domain)
    rescue Resolv::ResolvError
      false
    end
  end


end