Under Journal Transformation in the user interface there is an option called ‘Auto-creation Rules Management’. This option allows an operator to create rules around email addresses to identify certain email addresses as distribution lists.
Operators can add a rule to automatically mark ‘mailboxes’ matching the expression as distribution lists. Recipients are evaluated frequently and compared against a list of known distribution lists for their organization. When a match is made that recipient is marked as ‘set as distribution list’ in the solution automatically.