Exchange 2007 send as permission disappears after 2 hrs

We have 1 exchange 2007 server. We set exchange send as permissions on users, It does not matter if user is admin or not admin. The users are not in protected groups and admin count in adsiedit is set to 0. Also in Active directory the permission applies to this object only. After 2 hrs the permission disappears. No replication errors nothing to indicate any problems.

Any ideas?
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Justin DurrantSr. Engineer - Windows Server/VirtualizationCommented:
What groups is the user a member of?

Also, I would start investigating this by enabling "Object Access" auditing for the Active Directory Objects. You will have to go in and edit the default GPO for the domain controllers to enable success auditing for Object Access. After this setting has taken affect, you will then need to view the "Security" tab of the user in question and adding a new auditing entry to audit any writes to the user object. Once that is completed, whenever the specific object is modified you should see a 566 event being logged in the Security Log of the Event Viewer. This should give you some good information on who/what is modifying the object and what is being modified.
acs365serviceAuthor Commented:
Somehow domain users had been added to the server operators group! Marking each user with admincount of 1

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