wpmailbranding.php

/**
* Changes WP default From: Wordpress <[email protected]> emails header 
* to From: Blogname <[email protected]>. Customizable, drop it in your theme's functions.php to take effect.
* @author Adrian7 (http://adrian.silimon.eu)
*/
function wp_mail_branding($args){

	$wp_domain = @parse_url(get_bloginfo('url'));
	$wp_domain = $wp_domain['host'];
	
	$wp_blogname = get_bloginfo('name');

	//will not touch any existing headers
	if ( empty($args['headers']) ) $args['headers'] = "From: {$wp_blogname} <no-reply@{$wp_domain}>";
	
	return $args;
}

add_filter('wp_mail', 'wp_mail_branding', 99, 1);