You can't send a message on behalf of this user unless you have permission to do so. Please make sure you're sending on behalf of the correct sender, or request the necessary permission. If the problem continues, please contact your helpdesk.
I have a user that continues to get the error above when she tries to send an email from a shared mailbox, where she has been granted send as + full mailbox rights. I have tried to resolve the issue by re-creating the .ost file. However this only works for about 2 weeks and the error comes back. I have also deleted the OAB & cleared cache, however this only works for about 2 weeks before the issue re-appears. Has anyone out there experienced this before? Can anyone think of a solution to my problem?
Thank you
TD
TD