In the recent Eloqua Summer Release, there were 2 new flags available with email groups that should not be used as they were released ahead of availability of a future email privacy add on:
Remember, your emails will not be delivered if you check these boxes. Please do not use them at this time. These flags will be removed in an upcoming Summer Release Service Pack and we will update this advisory accordingly.
Tuesday, August 26th, 2:08 pm EDT (UTC -4)
This has been corrected and these options should no longer be visible.