Change sub-sites default email

I'm trying to set the default email from subsites on our WPressr multisite. I put this in the mu-plugins but it doesn't seem to work: http://collabedit.com/dbxsq

<?php
/* Plugin to set the default email from information per site for WPressr
* Subdomain = "Sitename" <mail@wpressr.com>
* Mapdomain = "Sitename" <mail@domain.com>
*/

add_filter( 'wp_mail_from', 'new_mail_from' );
add_filter( 'wp_mail_from_name', 'new_mail_from_name' );
function new_mail_from( $old ) {
$parse = parse_url(get_bloginfo('url'));
return 'mail@'.$parse['host'];
}
function new_mail_from_name( $old ) {
return get_bloginfo('name');
}