I hope someone can help. I have assigned a user send as permissions for about 20 members of our office. I did this in the EMC by simply managing send as permissions as I have done for many users in the past. This time the user will try to send as a certain person and get an error saying they do not have the permissions necessary even though they do. This does not always occur but happens enough to be very frustrating. I double checked the permissions in AD users & Computers and all appears to be correct.
I had read that you can only have 10 mailboxes assigned to Outlook and noticed that the cache of "send as" names seems to stop at 10. We have tried deleting all names but this seems to have no affect. I do not know if the number of users I have allowed one user the right to send as is the issue. Any help would be appreciated.