Send As permissions disapearing!

Hi,

I am having an issue with Exchange 2K and 2K3, runing on Win2K, 2K3 domains repectivley. I apply SEND AS rights to a user using the steps in KB article Q327000 only for the permissions to be stripped off an hour later.

Has anyone else come across this problem – it’s driving me crazy!

Any help is muchly appreciated.

Thanks in advance.