- You have two tenant organizations (Organization 1 and Organization 2) in a multi-tenant Microsoft Exchange Server 2010 environment. The environment has Exchange Server 2010 Service Pack 1 (SP1) or a later update rollup installed.
- Organization 1 has two mail-enabled users (User A and User B).
- Organization 2 has a distribution group that contains User A.
- User B in Organization 1 tries to send an email message to the distribution group that is in Organization 2.