We are running Exchange 2010 SP3 RU4, we have a setup as follow:
1- Dynamic distribution groups based on the DB membership and filters out hidden accounts, these were created in PS and are not manageable or viewable (for the large part) in EMC or ADUC. These lists are used primarily for third party archiving manipulation and management.
2- Master Distribution for all Employees (Moderated), created by adding all the above DD lists as described in point #1.
When I open up any of the Dynamic Lists and run the filter button, I don't see any of the hidden accounts filtered out as designed, yet when an email is sent out the Master Distribution list, all the hidden members receive the email.
I believe that the reason (as read on other threads) is that the DDL were not expanded prior to sending since the master distribution list is moderated and hence Exchange doesn't allow for it to be expanded.
Is that the reason why? if not what is the reason for that behavior? How can I solve this issue?
I also attempted to create a transport rule to block/delete such messages after defining a custom attribute to hidden mailboxes but couldn't get the right conditions/predicates to get the desired results.
Any input would be greatly appreciated.
Ash