Reply-To not working

Hi, my code is:

<?php

$mensagem = 'Lorem ipsum dolor sit amet, consectetur adipisicing elit. Nam voluptatum possimus aut, dignissimos! Velit laborum doloremque reiciendis dolorem pariatur officiis rerum facere praesentium assumenda sit obcaecati, sapiente quibusdam maxime dolores.';

$headers = array();
$headers[] = 'Reply-To:replyto@domain.com';

var_dump( wp_mail( 'to@domain.com', 'test', $mensagem, $headers ) );

?>