note 22729 added to ref.mail

having a little problem with the mail function. trying to generate several emails to addresses submitted by a user and i need to tell if any of these emails get returned as undeliverable. they do not, however get returned to the "reply to" address nor the "from" address. where would the returned message get sent? -- http://www.php.net/manual/en/ref.mail.php http://master.php.net/manage/user-notes.php?action=edit+22729 http://master.php.net/manage/user-notes.php?action=delete+22729 http://master.php.net/manage/user-notes.php?action=reject+22729