Attempt to send recovery email to alt_email

helpers.rb

# in config/initializers/devise/mailers/helpers.rb (I think)
module Devise
  module Mailers
    module Helpers
      def headers_for(action, opts)
        headers = {
          subject: subject_for(action),
          # overriding this one using the one from the form
          to: resource.notification_email, 
          from: mailer_sender(devise_mapping),
          reply_to: mailer_reply_to(devise_mapping),
          template_path: template_paths,
          template_name: action
        }.merge(opts)

        @email = headers[:to]
        headers
      end
    end
  end
end

user.rb

class User
  # new idea here, not sure if it will work.
  
  attr_writer :notification_email
  
  def notification_email
    # make sure you can't send to just any old email
    if @notification_email.present? && [email, alt_email].include? @notification_email
      @notification_email
    else
      email
    end
  end
  
  def send_reset_password_instructions(attributes={})
    recoverable = find_or_initialize_with_errors(reset_password_keys, attributes, :not_found)
    # Set this virtual attribute on the model
    recoverable.notification_email = attributes[:email]
    recoverable.send_reset_password_instructions if recoverable.persisted?
    recoverable
  end
end