Template:Configuring Exchange Journaling Preamble
Two types of journaling are available in Microsoft Exchange Server: standard and premium journaling. Standard journaling is configured on mailbox database level and records all sent and received emails of that database.
Premium journaling allows to limit journaling to particular recipients or distribution lists through rules; furthermore, internal and external emails can be treated differently. Additionally, premium journaling rules are replicated throughout the whole Exchange organization.
Notice: Premium journaling requires Exchange Enterprise CALs.