Currently, there are 2 supported downstream MTAs for the DLP Cloud Service for Email:
- Forwarding mode - goes to Email Security.cloud: this is for customers of O365, or G-Suite.
- Reflecting mode - as per Marc's statement above - the message goes back to O365 after inspection by DLP. This option is only available for users of O365.
Customers using Proofpoint of other MTA hosts would need to have a Forwarding mode configuration - and setup Email Security.cloud to go to that 3rd party vendor.
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Global Support Lead, DLP
Broadcom, Symantec Enterprise Division
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Original Message:
Sent: 04-10-2020 12:13 AM
From: Marc Zinsmeister
Subject: Reflect mode wth O365 and 3rd Party mail gateway
Has anyone configured the DLP cloud reflect mode within Office 365 and and using a 3rd party email security gateway (i.e. Mimecast or Proofpoint)? We have the O365 connectors and rules in place to send outbound mail to the DLP detector, then receive it with the inbound connecter, but want to confirm how to make the next hop to the 3rd party connector without causing a loop.