I have a problem with a send as permission in Exchange 2007. It just doesn't work.
So far I tried to do it in 3 ways:
1 and 2
I did it in AD U&C and when I checked after some time, it just dissipated.
When I tried to run a shell command, I've got:
Add-ADPermission : Extended right "SendAs" was not found. Please make sure you
have typed it correctly.
At line:1 char:17
+ Add-ADPermission <<<< "yyy" -User "domain\xxx" -Extendedrights SendAs
+ CategoryInfo : NotSpecified: (0:Int32) [Add-ADPermission], Mana
+ FullyQualifiedErrorId : 2D7E220F,Microsoft.Exchang
where yyy is the mailbox I want the other user to be able to send-as and domain\xxx is the user who will be sending as.
3 Obviously, first thing I tried before doing 1 and 2 was just right-clicking the mailbox in Exchange Management Console and choosing 'Manage Send As Permission' that didn't work and I'm pretty sure that what I set there will disappear too (I'm not 100% sure so I will monitor it again now).