Hi Mike,
the 'workqueue' command in the CLI will show you the size of the workqueue (messages that are currently being evaluated)
the 'tophosts' command will show you what is in the delivery queue waiting to be delivered
the 'status detail' command will show you both workqueue and delivery queue numbers
The queue sizes themselves are not configurable but message retention for the delivery queue is configurable via bounce profiles
More information can be found in the configuration guides:
http://www.cisco.com/en/US/docs/security/esa/esa7.6/ESA_7.6_Configuration_Guide.pdf
http://www.cisco.com/en/US/docs/security/esa/esa7.6/ESA_7.6_AdvancedGuide.pdf
http://www.cisco.com/en/US/docs/security/esa/esa7.6/ESA_7.6_Daily_Management_Guide.pdf
Regards,
Steve
Content Security Technical Services - RTP, NC
Cisco Customer Interaction: 1-800-553-2447