Tossed together this little template to cover the [few] OIDs Barracuda presents for monitoring their Message Archiver devices with SNMP. This pulls the queue length, the unfinished file length, and the total items in the archiver based on these OIDs:
* 18.104.22.168.4.1.20632.6.2 -- QueueFiles
* 22.214.171.124.4.1.20632.6.3 -- UnfinishedFiles
* 126.96.36.199.4.1.20632.6.4 -- IndexCount
I've tested it against a Barracuda Messaage Archiver 950 but I am of the understanding that any model shares the same OIDs.