if our users get over a certain number of messages in the trash, they won't delete when multiple messages are selected.
You can Select All, then delete. Messages just repopulate the list.
Fix: view a message in the trash and delete it from there. Then select all and delete. view another message and delete, then select all and delete.
So you have to delete 1 message at a time in between mass deletes.
Kinda wierd.