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Procedure

  1. In Cloud Email and Collaboration Protection, go to Policies → Global Settings → Other Settings → Inline Protection Settings for Exchange Online.
  2. To turn off Inline Protection for Exchange Online without revoking access to Exchange Online (Inline Mode), disable Inbound Protection and Outbound Protection under Inline Protection.
  3. To use the message header address for matching the approved or blocked sender lists in the ATP policy, select Message header address under Sender Address Match.
    The envelope address is always used for matching the lists.
  4. If you have also granted Cloud Email and Collaboration Protection access to Exchange Online, to avoid scanning an inbound message twice with the same security filters, enable Trust Scan.
    Trust Scan applies only to a security filter that is enabled for both Exchange Online and Exchange Online (Inline Mode) - Inbound Protection.

    Email Scanning by the Same Security Filter

    Protection Mode
    Scanning Time
    If Trust Scan Disabled
    If Trust Scan Enabled
    Exchange Online (Inline Mode) - Inbound Protection
    When email in transmission
    Scan
    Scan
    Exchange Online
    When email arriving at the mailbox
    Scan
    Not scan
    Note
    Note
    Trust Scan applies to real-time scanning only.