In Exchange 2007, I have given a AB user Full Access and Send-As permissions to XY. It was working perfect since a long time but today suddenlyXY is unable to send emails on behalf of AB. I checked the permission on Exchange server, there is nothing change, all permissions configured priviously are there. So whats wrong happening here?

AB ---> has Full Access and Send As permission on XY but you have not given XY Send As permission on AB so how can you expect that XY can send on behalf of AB?Vinod |CCNA|MCSE 2003 +Messaging|MCTS|ITIL V3|

Sorry its opposite, I mean to say AB is not able to send instead of XY. Its very strange, I mean working before and suddenly today all users are facing this problem who are authorized to send on behalf of others.

Did you add user into any admin groups recently? If so, it wouldinheritdeny send-as permission from those groups automatically...Amit Tank | MVP Exchange Server | MCITP: EMA | MCSA: M | http://ExchangeShare.WordPress.com

Would it be possible to download the OAB in OL? and then select the name from GAL rather than typing in FROM field? also check if the SEND AS right stil exists on the mailboxVinod |CCNA|MCSE 2003 +Messaging|MCTS|ITIL V3|

I already tried downloading OAB in OL. Also Send As rights are still there as before on all affected accounts.

It was a nk2 (cache) problem. I just selected from GAL and it works fine. Thanks Vinod.

Imran OHO,I am also facing the same issue in Exchange 2007. How exactly did you fix the problem?What is the nk2 (cache) what is the OAB in OL?What is the GAL?Thanks.