There are always new ways to implement PRTG, but Andreas Ginther takes it to a whole new level with the set-up of a letter count sensor for a smart post box using his own mailbox. The sensor tells him not only when he receives a letter, but also when the mailbox is empty. With the installation of two special light sensors that recognise when letters come through and if the mailbox is emptied a notification email is sent out to Andreas to keep him informed. A PRTG Custom Sensor starts a script that receives the details about the numberof letters that were posted, Andreas learnt in 10 months he had received 275 letters with the slowest month being July. In a project like this, the components were not free, but PRTG’s free 100 sensor license was sufficient for his solution to work completely.