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Outlook cannot send:  "you do not have permission to send the message on behalf of the specified user"

citslogin
citslogin asked
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Last Modified: 2012-05-05
Exchange 2003
Outlook 2003

Situation:

There is a account called "office" that is used as a common mailbox for many people to get into, and send and receive mail from.

1 of these accounts is called "user1"

So....

User1 logs onto the workstation and network.

User1 open outlook, where the profile has been setup to go to the mailbox of "office"

I have set Exchange mailbox permission on my ex server such that the user "user1" has full mailbox access.

The credentials for "user1" allow the mailbox for "office" to open properly because I have set the permissions on the Exchange server such.

The issue is when trying to send mail, every message  bounces, and the following is the error message:  "you do not have permission to send the message on behalf of the specified user"

Now I know what the "send on behalf" feature is, its used after a user grants another user delegate rights to their mailboxes, say for example when a boss wants a secretary to send out email on behalf of him.

This however is NOT that case.  The user (user1) is actually opening up the Outlook profile of the user "office"


This was working, and now is not, i'm not sure where to look.

Any ideas?
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