You can run the script by hand as root, verify in your mail server logs that a report got sent, verify on the server side it got received by your mail server, if it got delivered to the portaudit-receive.pl script succesfully you should have a file in your $savedir from this host. Assuming your MTA passed it to this script succesfully you'll have some log entries in your syslog files too that might help narrow down any issues.
