Noptin_Ajax::send_double_optin_email()

	public function send_double_optin_email() {

		// Ensure the nonce is valid...
		check_ajax_referer( 'noptin_subscribers' );

		// ... and that the user can import subscribers.
		if ( ! current_user_can( get_noptin_capability() ) ) {
			wp_die( -1, 403 );
		}

		if ( empty( $_POST['email'] ) || ! is_email( $_POST['email'] ) ) {
			wp_send_json_error( __( 'Subscriber not found', 'newsletter-optin-box' ) );
			exit;
		}

		$subscriber = new Noptin_Subscriber( $_POST['email'] );
		if ( ! $subscriber->exists() ) {
			wp_send_json_error( __( 'This subscriber no longer exists. They might have been deleted.', 'newsletter-optin-box' ) );
			exit;
		}

		if ( ! $subscriber->send_confirmation_email() ) {
			wp_send_json_error( __( 'An error occured while sending the double opt-in email.', 'newsletter-optin-box' ) );
			exit;
		}

		wp_send_json_success( __( 'A double opt-in confirmation email has been sent to the subscriber.', 'newsletter-optin-box' ) );

	}