'Send as' permission not working in Outlook. Exchange 2010.


We are facing an issue where we have assigned 'send as' permission to User ABC so that he can send mail as user XYZ.

It is being observed that whenever ABC user sends mails as XYZ it is successfully send from browser (OWA).However, If the same task is being performed from MS Outlook then ABC receives an Undeliverable email saying that the user does not have permission.

We have used powershell commands to assign permission and ABC user is having full access of XYZ.

Kindly help this is very urgent....
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Viral RathodConsultantCommented:
There are two possibilities,

1) MS Outlook in Cache Mode  - Uncheck and recheck Cache Mode Option.
2) Recreate MS Outloook Profile.- Try to recreate profile
rigelnetAuthor Commented:
Profile is already recreated. (Cache mode uncheck and recheck was done as well).

Data has been synced all over from the server. Still the issue persists.
rigelnetAuthor Commented:
User is working on MS office 2010 SP1.
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Viral RathodConsultantCommented:
After giving “Send-As” permission for the user,you have to wait for few hours.

If you do not want to wait then run following commands to make the changes effective immediately.

Clean-MailboxDatabase  -Identity "user-database-store"


Restart Information Store Service.

Also Is XYZ mailbox hidden from GAL ?
rigelnetAuthor Commented:
I have restarted the Informatioin store service also I have tried below solution from one  of the link but no luck.

1. Close Outlook
2. Delete the offline address book folder under “C:\Users\username\AppData\Local\Microsoft\Outlook\Offline Address Books”  (I assume it’s Windows 7 computer, look under C:\documents and settings\username\…. for XP computers).
3. Open Outlook and let it download new OAB.
rigelnetAuthor Commented:
Also I found this solution: User’s Outlook got bad/outdated cached contact information. Search for *.NK* files under user’s profile and delete it. Obviously Close the Outlook first before you delete the *.NK* files.

But I am not able to find .NK files. Can you provide me the path for the .NK files?
Simon Butler (Sembee)ConsultantCommented:
Outlook 2010 doesn't use nickname files. You are reading a solution for an older client.
Outlook 2010 SP1 is also very old - you should upgrade to Outlook 2010 SP2, then run Microsoft Update to patch the client.

Saying that though, it shouldn't make any difference. Ensure that you have not tried to set Send on behalf of permissions as well, and that the permission hasn't been removed from the account (if the user is an administrator, power user etc then the permission can be removed).

rigelnetAuthor Commented:
I have installed Office 2013 and the same issue still persists.

The permissions are only for "send as" and send on behalf is not even touched.

There is no doubt that permissions are properly assigned since 'send as' is working like it should be while using browser/owa.

Kindly let us know what needs to be done to solve it on outlook.
Will SzymkowskiSenior Solution ArchitectCommented:
Have you tried to create a new WINDOWS profile and test again? I have seen many times where it is the actual Windows profile that creates issues with how Outlook functions.


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Marwan OsmanCommented:
I have faced this problem before, and it is solved when we go to the new email, and in the from tab we select from "other email address" and type the email address manually, try it !!!
rigelnetAuthor Commented:
Thank you
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