Permission problem sending mail from Exchange 2003

Out of nowhere, one of the users on the domain can no longer send mail through a shared mailbox.
The user logs into the terminal using one username and there is another, "Shared", username within outlook.  I have checked permsissions in exchange server and even added that specific user with full permissions and I still recieve the message:

 You do not have permission to send to this recipient.  For assistance, contact your system administrator.
            MSEXCH:MSExchangeIS:/DC=local/DC=xx:xxxxx (x = domain name)

Any thoughts on what could cause this?  I am able to see all of the incoming, but it is getting rejected from the server.

I have tried other accounts setup the same way, and they can send.

Thanks in advance.
shawnlevinAsked:
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notenoughvespenegasCommented:
Sometimes disabling and enabling the user account of the mailbox (not the account of the user using the shared mailbox, but the mailbox's user account) helps. Don't ask why...
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