Ok here goes I have a small problem with one of our clients. Running Exchange 2003 and Windows SBS 2003 sp 1's They have an ad user "admin" (not administrator) which has a mailbox. I need to be able to grant "user1" sendas permissions for the user "admin". I have followed this document http://support.microsoft.com/default.aspx?scid=kb;en-us;327000 however the problem i am having is that the permissions get overwritten in around an hour or less. By that i mean that if i go in the security tab on the "admin" props, there is no listing for "user1" whatsoever. This is the same for any other user in any other OU, so its not localized. Send on behalf works no probs, but looks gay (not that there anything wrong with that ) :) I have also verified that the user is not a member of the administrative groups as documented here http://support.microsoft.com/kb/318180/ This seems to be quite a common problem but i havent seen a fix for it as yet Anyone got any ideas? My thoughts, some GP is overwriting it! Im soon to turn on auditing on the object and see what that tells me. Thanks Greg