Multi Tenant Exchange Journaling

Configuration of journaling in a multi tenant Exchange environment can be performed at the organisation level.  To do this simply run the following powershell command:

new-journalrule -Name "Mailsphere TENANT_ORG_NAME" -Organization "TENANT_ORG_NAME" -JournalEmailAddress -Scope Internal -Enabled $true

Note: make sure you replace the value TENANT_ORG_NAME with the name of the Organisation in your Exchange that you wish to configure journaling for.