Which two services must remain as on-premisses equipment when deploying a hybrid email solution?

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1. https://www.cisco.com/c/dam/en/us/td/docs/security/ces/overview_guide/Cisco_Cloud_Hybrid_Email_Security_Overview_Guide.pdf

   ”
   Cisco Hybrid Email Security is a unique service offering that combines a cloud-based email security
   deployment with an appliance-based email security deployment (on premises) to provide maximum
   choice and control for your organization. The cloud-based infrastructure is typically used for inbound
   email cleansing, while the on-premises appliances provide granular control—protecting sensitive
   information with data loss prevention (DLP) and encryption technologies.
   “

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