How much data goes from SMG to CAS/MA, from one company so calculation can be done for how many new CAS appliances would be need, since the CAS limit is 1000 samples sent to the clouds in one hour.
SMG/CASMA
Concerning the amount of data (samples) the Symantec SMG can submit to the Cloud Sandbox, refer to the below.
Ref.: Cloud Sandbox Submission Limits
Note that the submission limit is the same, regardless of the origin, or source, of the samples.
Additionally, refer to the Tech. Doc. below, for the guidance for integrating the CASMA with the SMG.
Ref.: Integrate Content Analysis with Symantec Messaging Gateway