First of all, you can use hook_mail_alter. While I'm not a fan of using hooks, this works:
/**
* Implements hook_mail_alter
*/
function MYMODULE_mail_alter(&$message) {
// set 'To' field to nothing, so Drupal won’t have any address
$message['to'] = '';
}
Or, just install this contrib module: Reroute Email
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