Issue Description: Although users are either correctly set up as members of shared mailboxes, or delegates with ‘Send As’ rights to user mailboxes in the Portal they still receive the following message in a non-delivery report when sending from the account in the Outlook Client, getting the error message as :
“This message could not be sent. Try sending the message again later, or contact your network administrator. You do not have the permission to send the message on behalf of the specified user.”
Latest Update and Guidance:This issues occurs when using an auto-complete entry that already resides in the Outlook Client auto-complete cache, and this needs to be removed and replaced with the ‘From’ mailbox selected directly from the Global Address List (GAL). Please attempt the following steps to resolve the issue:
- Go to the inbox of the shared mailbox you wish to send an email from in the Outlook Client.
- Click on ‘New Email’.
- Click on the ‘From’ drop-down button and it should show user’s personal nhs.net email address along with possibly the shared mailbox email address user is trying to send from. If the shared mailbox exists in the list click on the X next to the email address to remove the auto-complete entry. If the shared mailbox is not in the list, go to step 4.
- The ‘From’ drop-down list should persist, so click on the ‘Other Email Address..’ option.
- Rather than starting to type in the email address, click on the ‘From’ button to bring up the GAL.
- Find the shared mailbox in the GAL and double-click on it. The GAL will disappear and populate the ‘From’ box.
- Ensure that the ‘Send Using’ option is showing as your personal nhs.net email address.
- Click on ‘OK’.
- Try to send an email.
