I have a sandbox solution for SharePoint 2013. (because it has to work in Office365) I have an eventreceiver that adds an item to a list. I don't want users to manually change that list, so I don't give them rights on that list. However the eventreceiver is executed with the users privileges. Giving the user no rigths to the list means the eventreceiver won't work, and run with elevated privileges is not allowed in the sandbox. What would be the best way to accomplish this scenario?