Email notification does not work

hello,

i have noticed that many of these features are not available in the basic version although you mention them on your website
http://www.bravowp.com/downloads/wordpress-helpdesk-plugin/

but i would say email notification seems to be mentioned even in the settings.
how ever i have not manage to get any email notifications neither to the ticket creator (who is a contributor) nor to the assigned agent who is the site admin.

i have checked both with gmail and other providers, nothing arrives.
turned on log (debugging) but nothing inside as error or failure or message.

so what should be done, how shall this work?
cheers
jf