A catchall mailbox is a mailbox to which any email not destined for a specific mailbox is delivered. For example, if someone were to send an e-mail to firstname.lastname@example.org, it would get routed to a catch-all address for the example.com domain. If no catch-all mailbox had been set up, the email would simply be returned to the sender with an error message.
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If you need to track and report on all changes made to all Exchange Server configurations and permissions, Netwrix can meet your needs as well. The Exchange Change Reporter generates reports that show changes to configuration settings, creation and deletion of mailboxes, information stores, Exchange servers, connectors, protocol parameters, storage groups and many other types of objects and their permissions. These reports include who, what, when information, and "before" and "after" values for each modification.