Disable auto forwarding email to external recipients using Microsoft Flow
There are several ways to block auto forwarding of email to external recipients via Exchange Online. However there's also an option to create a flow for new email enabling auto forwarding to external recipients using Microsoft Flow! Problem with this method is that none of the existing methods of blocking these emails is applicable. These emails are directly sent form the users mailbox and therefor not apply to the existing rules. The DLP option for flow is also not able to prevent this because it only blocks sharing data between connectors. Because everyone with enabled Azure AD account is able to use Microsoft Flow (even if they don't have the feature enabled within their license plan), there's no way to block this (as far as I know). Is there any way to avoid this?
