Emails not sent - and missing /mail/ folder

Hi,

just installed osTicket yesterday, and it works fine fetching emails. BUT emails are not sent, neither to customers or to operators/ admin.

I've tried all different settings I can find, but it doesn't help. I also opened the class.mailparse.php file, and it says to

require_once('Mail/mimeDecode.php');

require_once('Mail/RFC822.php');

However I can't find that folder and files... ???

Is something missing from my installation? (in case it's not in the download from this page, neither in the Fantastico install I tried too.)

See image from my FTP connection here:

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My server allows sending mail via php. At least other scripts does use it...

Thanks for helping ;-)