T5 Filter System From Mail

t5-filter_system_from_mail.php

<?php # -*- coding: utf-8 -*-
/*
 * Plugin Name: T5 Filter System From Mail
 * Description: Sets the WP from mail address to the first admin’s mail and the from name to blog name.
 * Plugin URI:  http://toscho.de/?p=2201
 * Version:     2012.08.30
 * Author:      Thomas Scholz
 * Author URI:  http://toscho.de
 * License:     MIT
 */

if ( ! function_exists( 't5_filter_system_from_mail' ) )
{
	/**
	 * First admin's e-mail address or blog name depending on current filter.
	 *
	 * See wp-includes/pluggable.php::wp_mail()
	 *
	 * @param  $input Name or email address
	 * @return string
	 */
	function t5_filter_system_from_mail( $input )
	{
		if ( 0 !== stripos( $input, 'wordpress' ) )
		{
			return $input; // Not auto-generated
		}

		return get_option( 'wp_mail_from' == current_filter()
			? 'admin_email' : 'blogname' );
	}

	add_filter( 'wp_mail_from',      't5_filter_system_from_mail' );
	add_filter( 'wp_mail_from_name', 't5_filter_system_from_mail' );
}