Because the report relies on the time on the unit, you should check that the time is correct. You probably want to check your General Time and Email settings. You can use a packet capture to see if the SMTP traffic is flowing out of the protected interface around midnight although that probably would require you start the capture around the expected time otherwise it would get quite large. The fact that you get the first email, but no others leads me to believe there is more likely an issue with the time than the email settings.
Please note the BSC 2100 is unfortunately end-of-life and end-of-support, so we may find this issue difficult to resolve.
