After having discussed with Infomaniak support, i realised that their cronjob system is web-based.
We don’t have access to the shell to execute archive.sh.
This means in my case that PDF reports can not be sent using this method.
It is necessary to use a web-based service to do so (any php script) executable by apache within the domain where piwik is hosted.
Is this functionality allready available in piwik ?
Thank you for your support