Block external forwarding in Exchange Online
External forwarding should always be disabled by default in any tenant, as it is commonly used by intruders to extract confidential emails from key individuals within the organization….
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Find External Email Forwarding rules in Microsoft365 Exchange Online
NOTE: This has been added as a GUI view in the new Modern Exchange Admin Center. https://admin.exchange.microsoft.com/#/reports/autoforwardedmessages I have encountered instances where mailbox rules were used to silently…