rails_email_validator_patch.rb

# Rails email validator is required by the secure validatable module in devise security extension
# However, it handles internation domain names and does mx lookups by default, and there's no easy way to change this default.
class EmailValidator
  def validate_mx?
    options[:validate_mx] == true
  end
  def allow_idn?
    options[:allow_idn] == true
  end
end