There is a device in out home network periodically sending spam emails. Our internet provider blocked our internet access due to this reason. I scanned all devices with diferent malware scanners but couldn't find the responsible device. The provider cannot tell us which one it is. All I know is the date and time the emails are sent. Is there a possibility to track the traffic and, given we know date and time, find out which device was active at that sepcific time?