i saw the solution somwhere
i pasted the following code in main.inc.php
#Enable the use of local mail
ini_set('SMTP', 'webmail.trgworld.com'); // SMTP of your provider (same as in Outlook)
ini_set('sendmail_from', 'helpdesk.folder@yourdomain.com'); // Your emailaddress
________
(Harley-Davidson FLHPEI)