A data security system, including a security manager remotely controlling, via a network application programming interface, a cloud-based service that performs data-exchange transactions for end users, operative to cause the service to prevent end user access to incoming transactions so that the security manager accesses the incoming transactions prior to end users being able to access the incoming transactions, and a data inspector operative to inspect data of incoming transactions for security clearance by invoking one or more content scanners, wherein the security manager is further operative to cause the service to restore end user access to the incoming transactions, when the security inspector clears the data, and to cause the service to perform a remedial action vis-à-vis the incoming transactions, when the security inspector does not the data.