note 29991 added to ref.mail

could somebody tell my why the mail function doesn't work with an emailadress which contains a "-" character? for example if i use a someone@domain-support.com the email will not be delivered on that adress. in fact the email will never be delivered. can somebody give me a solution? -- http://www.php.net/manual/en/ref.mail.php http://master.php.net/manage/user-notes.php?action=edit+29991 http://master.php.net/manage/user-notes.php?action=delete+29991 http://master.php.net/manage/user-notes.php?action=reject+29991