Step 2: Configuring a Journaling Rule for an External Mailbox
Create a journaling rule in Exchange Online that will forward a copy of all emails to the 3rd party journaling mailbox configured in Step 1 (based on our example: journalingm@outlook.com).
Detailed information on how to carry out this procedure is provided at the following link: http://go.gfi.com/?pageid=MAR_O365JournalingRule
See also: