WordPress: Change email sender and from name

<?php
add_filter('wp_mail_from', 'new_mail_from');
add_filter('wp_mail_from_name', 'new_mail_from_name');

function new_mail_from($old) {
     return 'admin@seuwordpress.com.br';
}

function new_mail_from_name($old) {
return 'Nome do seu site';
}

?>