Email Report automatic

Hi,
I configured the reports by email, but they are not sent. In “Manage Email Report” : I can get reports in PDF and also send them to my email. But I do not know when to configure Piwik sent to me automatically every week without going in “Manage Email Report”.
Is there something to configure on the server? Thank you in advance for your help.
Jo

Did you choose “Daily” email reports? try the reports and disable the graphs maybe?